担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this work atomically dispersed antimony P-doped carbon nitride was prepared with the aim of producing hydrogen peroxide under visible light irradiation and of obtaining organic contaminants degradation. The conjugation of the P-doping can induce significant increase in visible light harvesting, narrowing of band gap energy and shift of the upper edge of the VB to less positive value and the introduction of Sb can efficiently trap oxygen molecules in the Sb-OO end-on structure and at the same time accumulate electrons which act as the photoreduction sites for O2 via a 2e− ORR pathway. Pristine C3N4 and P-doped C3N4 were prepared as references using melamine and ammonium dihydrogen phosphate as precursors and different amount of Sb were added (x = 0.5, 1, 3, 5 mmol) to synthetize Sbx P-doped C3N4. All materials were characterized with multiple techniques, tested for the hydrogen peroxide production and for the degradation of carbamazepine. The pristine C3N4 led to a H2O2 poor production but with the introduced modifications the yield increased and an upward trend during the time was observed. The optimum amount of Sb was found to be 1 mmol and it led to the production of more than 7 times the amount produced by pristine carbon nitride. The degradation of carbamazepine using only visible radiation required prolonged timescales but when we expand the light spectrum to include near-UV, the abatement of the pollutant is achieved in a few hours. The efficiency of the synthesized materials in hydrogen peroxide production suggests possible future developments that take advantage of the excellent peroxide production of atomically dispersed antimony P-doped carbon nitride photocatalysts in Fenton-like processes or involve the use of peroxidase enzymes to achieve enhanced degradative performances.

DOI： 10.1016/j.surfin.2024.104143

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85189973181&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

In this study, the truncated octahedral CeO2 (CeO2-to) with special morphology was prepared by the solvothermal method with oleic acid (OA) and oleamine (OM) as the morphology-directing agents. High-resolution transmission electron microscopy (HRTEM) results show that CeO2-to exposes composite {100} and {111} facets, while CeO2 cubic (CeO2-c) and CeO2 octahedral (CeO2-o) only expose single crystal facets of {100} plane and {111} plane, respectively. Interestingly, this CeO2-to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde (CH3CHO) degradation, in which CO2 generation value reaches 1.78 and 7.97-times greater than that of CeO2-c and CeO2-o, respectively. In addition, the active species trapping experiment signifies that superoxide (·O2−) and holes (h+) are the main reactive substances during the CH3CHO degradation process, and the electron paramagnetic resonance (EPR) spectra indicates that the former is the major contributor. Notably, the electron transfer mechanism between CeO2-to {100} and {111} facets and the surface oxygen adsorption ability are revealed via density functional theory (DFT) calculations. It is also confirmed that {100} facets are more conducive to the absorption of acetaldehyde than {111} facets. Finally, a reasonable mechanism for improved photocatalytic CH3CHO degradation on CeO2-to is proposed based on relevant experiments and DFT calculations. This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds (VOCs). It also offers additional direction for optimizing the photocatalytic activity of other cerium-based photocatalysts. Graphical abstract: (Figure presented.)

DOI： 10.1007/s12598-023-02566-9

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85184244309&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this work, a two-step solvothermal method was used to design CeO2/ZnTCPP composites for photocatalytic hydrogen evolution. Systematic characterization including morphological, structural, optical and electrochemical measurements revealed a correlation between the sample structure and photocatalytic activity. Compared with pure CeO2 and ZnTCPP, the optimized CeO2/ZnTCPP photocatalyst has good hydrogen production performance (1314.6 μmol g-1h-1). At the same time, the catalyst can still maintain a high hydrogen production rate (1162.7 µmol g-1h-1) under visible light. The experimental results showed that the CeO2/ZnTCPP composites have high carrier separation efficiency, which is attributed to the formation of a type-II heterojunction in the structure between the CeO2 and ZnTCPP.

DOI： 10.1016/j.matlet.2024.135925

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85183147552&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Long-term exposure to low concentration indoor VOCs of acetaldehyde (CH3CHO) is harmful to human health. Thus, a novel isogenous heterojunction CeO2/Ce-MOF photocatalyst is synthesized via a one-step hydrothermal method for the effective elimination of CH3CHO in this work. This CeO2/Ce-MOF photocatalyst performs well in CH3CHO removal and achieves an apparent quantum efficiency of 7.15% at 420 nm, which presents ≈6.7 and 3.4 times superior to those generated by CeO2 and Ce-MOF, respectively. The enhanced efficiency is due to two main aspects including i) an effective photocarrier separation ability and the prolonged reaction lifetime of excitons play crucial roles and ii) the formation of an internal electric field (IEF) is sufficient to overcome the considerable exciton binding energy, and increases the exciton dissociation efficiency by up to 50.4%. Moreover, the reasonable pathways and mechanisms of CH3CHO degradation are determined by in situ DRIFTS analysis and simulated DFT calculations. Those results demonstrated that S-scheme heterojunction successfully increases the efficiency of harmful volatile organic compounds elimination, and it offers essential guidance for designing rare earth-based MOF photocatalysts.

DOI： 10.1002/smll.202308743

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176144732&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

2D/2D Ni-MOF/g-C3N4 nanocomposite was utilized for desulfurization. The multilayer pore structure and high specific surface area of Ni-MOF/g-C3N4 promote the adsorption and conversion of thiophene. In addition, the two-dimensional structure exposes more active centers and shortens photogenerated carrier migration to the material surface distance, it enhances photogenerated charge transfer. The Ni-MOF and g-C3N4 construct a Z-scheme heterojunction structure with tight contact, it effectively enhances the material's photocatalytic redox ability. In the light, the material generates more photocarriers for the production of free radicals including hydroxyl radicals, holes, and superoxide radicals. The higher carrier concentration of Ni-MOF/g-C3N4 promotes the activation and oxidation of thiophene, consequently enhancing the photocatalytic desulfurization capability. The results showed that the conversion of thiophene was 98.82 % in 3 h under visible light irradiation. Radical capture experiments and analysis using electron paramagnetic resonance spectroscopy demonstrated that superoxide radicals, holes, and hydroxyl radicals played crucial roles in PODS (photocatalytic oxidative desulfurization). In addition, DFT (density functional theory) calculations were conducted to determine the paths of electron migration and TH (thiophene) adsorption energy. Finally, a mechanism for photocatalytic desulfurization was proposed based on the comprehensive analysis of theoretical calculations and experimental studies.

DOI： 10.1016/j.jcis.2023.12.105

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85180550483&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

A novel TiO2(B)/phosphidated CoFe Prussian blue analogs (CoFeP) photocatalyst with core–shell structure was synthesized by hydrothermal method for the activation of peroxymonosulfate (PMS) to degrade TC under solar light. TiO2(B), an ultrathin two-dimensional (2D) layered material, is widely used in photocatalysis. However, the low light absorption efficiency and slow electron mobility limit the application of TiO2(B) in photocatalysis. Here, TiO2(B) was in-situ grown on the surface of phosphidated CoFe Prussian blue analogs (CoFeP). The composites with a core–shell structure can activate peroxymonosulfate (PMS) to degrade tetracycline (TC) under solar light. The optimized TiO2(B)/CoFeP heterojunction achieves a TC degradation rate of 94 % within 5 min, due to that it effectively suppresses the recombination of photogenerated charges and improves light absorption ability. The phosphorization of CoFePBA (CoFe Prussian blue analogs) not only promoted the formation of hollow structures but improved the carrier mobility between TiO2(B) and CoFeP. At the same time, the rapid redox cycle of Fe and Co metal ions promoted the activation of PMS and the rapid degradation of TC. This work provides a new core–shell TiO2(B)/CoFeP heterojunction for sustainable water purification via PMS activation.

DOI： 10.1016/j.apsusc.2023.158667

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85174209241&origin=inward

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Two-dimensional (2D) beta indium sulfide (β-In2S3) shows great potential in photocatalytic hydrogen production due to its broad-spectrum response, relatively negative conduction band edge, high carrier mobility and low toxicity. However, the high charge recombination rate limits the application of In2S3. Here, we in-situ grew 2D cadmium sulfide (CdS) on the surface of In2S3 doped with copper ions (Cu2+) to construct a heterojunction photocatalyst that suppresses charge recombination. The in-situ grown method and shared sulfur composition were conducive to forming the efficient interface contact between In2S3 and CdS, promoting charge transfer and showing the high spatial charge separation rate, resulting in a hydrogen production rate of 868 µmol g-1h−1. The induced Cu2+ extended the light absorption range and stabilized the photocatalyst. By creating stable 2D/2D heterojunction photocatalysts with high charge separation efficiency, this work opens new possibilities for applying In2S3 materials in photocatalytic hydrogen production.

DOI： 10.1016/j.jcis.2023.08.149

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85170033142&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this study, a new brookite TiO2/monolayer Ti3C2Tx MXene/Au composite was developed for photocatalytic synthesis of hydrogen peroxide (H2O2). The optimal ratios of MXene and Au were found to be 0.4% and 15%, respectively. Quenching experiments confirmed that the superoxide anion radical (·O2−) was the primary intermediate species in the reaction, suggesting a two-step, single-electron indirect process. The improved efficiency of H2O2 production was attributed to the effects of MXene and Au, which help to separate and transfer photogenerated electron-hole pairs and suppress their recombination.

DOI： 10.1039/d3cy01098h

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85176097904&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this research, Pt-loaded TiO2 was prepared by photodeposition used for acetic acid photocatalytic reforming. CO2 was injected into an acetic acid solution for removing O2 and inducing the formation of CO32–. The production rate of CH4 were higher in a CO2 atmosphere than that in an Ar atmosphere (about 69%). According to electron spin resonance (ESR) analysis, more •CH3 radical was produced in CO2 atmosphere, suggesting that CO2 introduced in acetic acid solution can better promote acetic acid reforming to CH4. On the contrary, the production rate of H2 is higher under an Ar atmosphere than that under CO2, suggesting a peroxidation of acetic acid transferred to H2.

DOI： 10.1016/j.matlet.2023.134552

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85162253342&origin=inward

担当区分：最終著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Suppression of photogenerated charge recombination is crucial for efficient photocatalytic hydrogen production. Homojunctions have garnered more attention than heterojunctions due to their superior crystal binding and band structure matching. However, most homojunctions suffer from redox interference caused by continuous oxidizing and reducing phases that impede the ability to improve photocatalytic activity. Consequently, the preparation of homojunction photocatalysts with completely spatial separation of both in charge and redox phases remains challenging. Here, the preparation of a two-dimensional (2D) homojunction CeO2 with a back-to-back geometry and fully separated oxidizing and reducing phases is reported. The prepared CeO2 is composed of nanosheets with two contrasting smooth and rough surfaces. Experimental and theoretical results indicate that the rough surface contains more highly reducing CeO2{220} and strongly visible-light-absorbing CeO2{200} facets than the smooth surface. The 2D homojunction CeO2 produces three-times more hydrogen than normal CeO2 nanosheets, and even more than that of CeO2 nanosheets loaded with gold nanoparticles. This work presents a new homojunction photocatalyst model with completely spatial separation of both in charge and redox phases that is expected to inspire further research into homojunction photocatalysts. Graphical abstract: [Figure not available: see fulltext.].

DOI： 10.1007/s12598-023-02505-8

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85175957088&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this study, Fe ions doped ceria with two different morphologies were synthesized and their photocatalytic abilities of gaseous acetaldehyde degradation were compared. Interestingly, the photooxidation ability of Fe/CeO2 nanorods (Fe/CeO2-r) for acetaldehyde removal reaches 4.72 times higher than that of pure CeO2 nanorods (CeO2-r). It was found that Fe/CeO2-r and CeO2-r mainly exposed {110} and {100} facets, while CeO2 and Fe/CeO2 with cube morphology mainly exposed {100} facets. The aberration-corrected HAADF-STEM detection for Fe/CeO2-r illustrates isolated dispersion of Fe atom and these Fe atoms were indeed doped into CeO2 crystals via replacing Ce atoms. More importantly, EPR measurement shows that the ·O2− signal intensity of Fe/CeO2-r is stronger than that of other photocatalysts, which means that a large number of active oxygen species are formed during the photocatalytic reaction of volatile organic compounds (VOCs) degradation process. In addition, the dependence of iron ions doping was also analyzed by density functional theory (DFT) calculations and clearly confirmed that Fe/CeO2 {110} is more conducive to the acetaldehyde absorption and carbon dioxide desorption than Fe/CeO2{100}, which is greatly agreement with the experimental results. In a word, the photocatalytic acetaldehyde pollutions degradation efficiency of ceria-based photocatalysts can be improved by Fe ions doping which provides a feasible strategy for improving the performance of other semiconductor photocatalyst materials.

DOI： 10.1016/j.apmt.2022.101651

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85140792190&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Spray pyrolysis technology for a uniform and high conductive Cu3BiS3 (CBS) electrode was developed in order to carry out the water splitting reaction. A heterojunction photocathode consisting of a p-type Cu3BiS3 and an n-type In2S3 semiconductor was successfully fabricated and further modified by Pt particles for hydrogen generation in a PEC cell. Modification of the n-type semiconductor In2S3 significantly improved the electron-hole separation efficiency, leading to a photocurrent of –223 μA·cm−2 under an applied bias of 0 VRHE. Pt particles were used as effective cocatalysts in water reduction. Under visible light irradiation, H2 was generated with an excellent Faraday efficiency of 94% using Pt/In2S3/Cu3BiS3 as a photocathode under the applied bias of 0 VRHE.

DOI： 10.1016/j.matlet.2022.132801

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85134611324&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Carrier dynamics and surface reaction are two critical processes for determining the performance of photocatalytic reaction. Highly designable polymer-based photocatalysts have shown promising protectives in energetic and environmental applications. In this prospective, we first distinguished the differences of physiochemical properties between polymer-based semiconductors and traditional inorganic semiconductors. Then, the effects of single-atom sites on the charge dynamics and reaction kinetics of polymer-based photocatalysts are further elaborated. Time(excitation)-space(wavefunction) population analysis, which can provide relevant information to clarify the structure-excitation relationships after introducing the single atom sites was also reviewed. In the future, with the further development of artificial intelligence, the establishment of an energy function with a regression accuracy close to or reaching the level of density functional theory is highly desired to infer the energetic diagram of the photocatalytic systems at the excited states. Furthermore, coordination structures, interaction with inorganic semiconductors, photocatalytic stability and solvent effects should also be carefully considered in the future studies of polymer-based photocatalyst.

DOI： 10.1007/s40242-022-2215-6

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85136497513&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Ceria and its derivatives are environmentally-friendly and sustainable photocatalysts with a strong oxygen storage/release ability, good photostability, and high cost-effectiveness. In this work, nitrogen and sulfur synchronously doped ceria (NS-CeO2) with a regular nanorod morphology was successfully prepared, in which doping was obtained just from one precursor and by one-step calcination treatment. The photooxidation performance of acetaldehyde on NS-CeO2 was significantly better than that on undoped ceria. As confirmed by density functional theory (DFT) calculations, the oxygen atoms exposed on the surface were partially replaced after doping with nitrogen and sulfur, resulting in the generation of new impurity level states near the Fermi level and reduction of the bandgap of NS-CeO2. Meanwhile, the increased concentration of oxygen vacancies formed a doping transition state which can act as an effective electron capture center. In addition, this transition state further exhibits a mediation role in interfacial charge separation due to its effective restriction of the recombination of electrons and holes, which can further improve the photocatalytic performance of NS-CeO2. Herein, an effective strategy for synthesizing non-metal doped CeO2-based semiconductor photocatalysts that can degrade volatile organic compounds is proposed.

DOI： 10.1039/d2cy00934j

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85137932292&origin=inward

担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Titanium dioxide (TiO2) photocatalyst is widely used in wastewater treatment. The favourable attributes of TiO2 such as chemically stability, cost-effectiveness, low toxicity to humans and high catalytic activity have received extensive attention from researchers seeking to design better materials. Nevertheless, one of the drawbacks of TiO2 photocatalyst is the powder form which is capable of reducing its performance. This phenomenon is attributed to the low active surface area, decreased light absorption and limited contact area with the pollutants in an aqueous system. Therefore, researchers have developed new ideas by immobilising potential catalysts onto a buoyant substrate to design an effective buoyant photocatalyst. This review aims to discuss the crucial properties of the buoyant substrates and promote the benefits of designing the ideal TiO2-based buoyant photocatalysts. Moreover, several vital parameters have been underlined in the fabrication methods to ensure high stability and durability of the buoyant photocatalysts during the photocatalysis process. Additionally, the activation methods of hydrogen peroxide (H2O2), persulfate (PS) and peroxymonosulfate (PMS) for the photodegradation of pollutants are also highlighted in this review paper. The good reusability of the synthesised buoyant photocatalysts is proven as a good indicator of their stability. Furthermore, this review article suggests potential guidelines for the researchers in the fabrication of the TiO2-based buoyant photocatalysts for wastewater treatment applications in the future.

DOI： 10.1016/j.jece.2022.107549

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85128881208&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Photocatalysis has gained attention as a viable wastewater remediation technique. However, the difficulty of recovering powder-based photocatalyst has often become a major limitation for their on-site practical application. Herein, we report on the successful in-situ preparation of a novel three-dimensional (3D) photocatalyst consisting of Cu2O/TiO2 loaded on a cellulose nanofiber (CNF)/reduced graphene hydrogel (rGH) via facile hydrothermal treatment and freeze-drying. The 3D macrostructure not only provides a template for the anchoring of Cu2O and TiO2 but also provides an efficient electron transport pathway for enhanced photocatalytic activity. The results showed that the Cu2O and TiO2 were uniformly loaded onto the aerogel framework resulting in the composites with large surface area with exposed actives sites. As compared to bare rGH, CNF/rGH, Cu2O/CNF/rGH and TiO2/CNF/rGH, the Cu2O/TiO2/CNF/rGH showed improved photocatalytic activity for methyl orange (MO) degradation. MO degradation pathway is proposed based on GC-MS analysis. The enhanced photoactivity can be attributed to the charge transfer and electron-hole separation from the synergistic effect of Cu2O/TiO2 anchored on CNF/rGH. In terms of their anti-bacterial activity towards Staphylococcus aureus and Escherichia coli, the synergistic effect of the Cu2O/TiO2 anchored on the CNF/rGH framework showed excellent activity towards the bacteria.

DOI： 10.1016/j.chemosphere.2021.131731

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85111954587&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

<p>Photocatalytic H₂O₂ production based on graphitic carbon nitride (g-C₃N₄) materials has been attracting increasing attention. However, it is difficult to reveal the inner relationships among the structure, properties and performance of a g-C₃N₄-based photocatalyst by simply summarizing preparation methods, properties and performances in previous works. In this review, the three most important issues for improving H₂O₂ generation based on the band diagram and physicochemical properties of pristine g-C₃N₄ are proposed. Improvement of the charge separation, promotion of the light absorption and introduction of active sites for 2e^– oxygen reduction reaction to suppress side reactions are the most three attractive strategies for enhancing the activities. Following discussion of these strategies, representative functionalization methods are summarized on the basis of the most desired properties for improving the photocatalytic activities for H₂O₂ production. Other influence factors for improving H₂O₂ production such as addition of electron donors and adjustment of pH value of the solution are also discussed. Future challenges for photocatalytic H₂O₂ based on g-C₃N₄ materials are also summarized to provide future directions in this field.</p>

DOI： 10.14356/kona.2023004

Scopus

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85146435909&origin=inward

担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

The importance of pollutant remediation using solar energy is increasingly acknowledged as a viable method to solve the current environmental problems. To date, three-dimensional (3D) graphene architectures have demonstrated excellent photocatalytic performance due to their salient characteristics. The hydrothermal treatment is the commonly reported synthetic protocol in preparing various novel hybrid 3D graphene architectures. This chapter focuses on the recent progress in developing and applying hybrid 3D graphene for the photocatalytic remediation of organic pollutants such as dye molecules, emerging contaminants, and heavy metals. Various novel design based on semiconductor/3D graphene has led to the creation of highly efficient heterojunction photocatalyst. The transformation to a 3D architecture does not only improve the accessible surface area but also enhanced light harvesting capability and charge transport. In addition, we have also made an effort to discuss some photocatalytic antibacterial disinfection innovations. Finally, prospects in the construction of hybrid 3D graphene possessing enhanced photocatalytic materials are presented. Graphical Abstract: [Figure not available: see fulltext.].

DOI： 10.1007/s11244-022-01610-9

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85128710289&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

To date, studies pertaining the usage of aliphatic dicarboxylic acids (DCAs) in the preparation of graphene-based hydrogels are limited and mainly has been applied either as a reducing agent or cross-linkers. The modification of the hydrogels' properties can be achieved via the introduction of small amount of additive into the starting material, graphene oxide (GO). The facile synthetic protocol enables the impartation of desired properties to the graphene-based hydrogel as intended for their specific applications. In this study, the in-situ preparation of reduced graphene hydrogel (rGH) was carried out in the presence of a series of aliphatic DCAs namely oxalic acid (OA), malonic acid (MA), succinic acid (SA), glutaric acid (GA) and adipic acid (AA) in the GO reaction mixture via green hydrothermal method and freeze-drying. The as-prepared hydrogels were systematically characterized to probe the changes in their chemical and physical changes. Higher specific surface (SSA) of the hydrogel is obtained for shorter chain length DCAs. The FTIR and XPS results also indicated that shorter chain DCAs exhibited better reducing capability in the removal of oxygen functional groups. The C/O ratio obtained showed decrement with the increase in the chain length of the DCA. On the other hand, good dispersity was found for longer chain DCAs in polar solvent. Overall, this study should provide a comprehensive understanding on hydrothermally reduced graphene hydrogels prepared in the presence of dicarboxylic acids.

DOI： 10.1007/s10934-021-01072-6

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85104137686&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

In this work, waxberry-like CeO2 photocatalyst (denoted ASC) with prominent visible-light-driven photocatalytic performances for multi-model reactions was achieved by Sm doping and Ag quantum dots (QDs) anchoring. For instance, the as-fabricated ASC acquired 7.08-times and 6.83-times higher activities for CH3CHO removal and H2 production than those of pure CeO2 counterpart, respectively. The concentration of oxygen vacancies (Ov) in CeO2 is distinctly increased by Sm doping, resulting in a narrower bandgap of the Sm-doped CeO2 (SC). Under visible light irradiation, the Ov caused by doping can capture the photo-excited electrons and construct a doping-related transition state between the conduction band (CB) and the valence band (VB), which can effectively limit the recombination of photo-excited electrons and holes. These captured electrons further fleetly transfer to the co-catalytic sites of anchored Ag QDs, strengthening the absorption utilization for visible-light synchronously. The migration of charge carriers and proposed mechanisms were well elaborated by transient photovoltage (TPV), surface photovoltage (SPV) and density functional theory (DFT) calculation. It is hoped our work in this paper could provide potential and meaningful strategies for the design of noble metal quantum dots modified metal oxide semiconductors and facilitate their applications in other photocatalytic fields effectively.

DOI： 10.1016/j.apcatb.2020.119845

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85099400439&origin=inward

担当区分：責任著者   記述言語：その他外国語   掲載種別：記事・総説・解説・論説等（その他）

In the version of this Article originally published, the Acknowledgements section incorrectly acknowledged funding from the ‘Singapore Ministry of Education Academic Research Fund (AcRF) Tier 1 RG115/17 and RG115/18, and Tier 2 MOE2016-T2-2-004, and the Singapore Energy Center (SgEC) grant no. M4062755.120’; this has been changed to the ‘Singapore Ministry of Education (Tier 1: RG4/20 and Tier 2: MOET2EP10120-0002) and the Agency for Science, Technology and Research (A*Star IRG: A20E5c0080)’.

DOI： 10.1038/s41929-021-00644-8

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85107493714&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Artificial photosynthesis offers a promising strategy to produce hydrogen peroxide (H2O2)—an environmentally friendly oxidant and a clean fuel. However, the low activity and selectivity of the two-electron oxygen reduction reaction (ORR) in the photocatalytic process greatly restricts the H2O2 production efficiency. Here we show a robust antimony single-atom photocatalyst (Sb-SAPC, single Sb atoms dispersed on carbon nitride) for the synthesis of H2O2 in a simple water and oxygen mixture under visible light irradiation. An apparent quantum yield of 17.6% at 420 nm together with a solar-to-chemical conversion efficiency of 0.61% for H2O2 synthesis was achieved. On the basis of time-dependent density function theory calculations, isotopic experiments and advanced spectroscopic characterizations, the photocatalytic performance is ascribed to the notably promoted two-electron ORR by forming μ-peroxide at the Sb sites and highly concentrated holes at the neighbouring N atoms. The in situ generated O2 via water oxidation is rapidly consumed by ORR, leading to boosted overall reaction kinetics. [Figure not available: see fulltext.]

DOI： 10.1038/s41929-021-00605-1

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85106644815&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

A systematic investigation of electronic configuration and excitation properties is extremely urgent for establishing a guideline to boost H2O2 production with metal single-atom photocatalysts (M-SAPCs). Herein, a series of metal-ion incorporated M-SAPCs was prepared, isolating of three transition metals (Fe, Co, Ni) and two main-group metals (In, Sn) single site by pyridinic N atoms in polymeric carbon nitride (PCN) skeleton. The models in which metal ions are isolated by non-defected g-C3N4 units (Melem_3M) are consistent with the practically prepared M-SAPC in terms of band structures and electronic configurations. Transition density and molecular orbital analysis revealed that the atomically dispersed In (III) and Sn (IV) significantly improve the charge separation with an ideal electronic configuration for the end-on adsorption of oxygen for a boosted 2e−. The experimental charge separation properties and photocatalytic activities of M-SAPC showed good accordance with the computed charge transfer profiles of Melem_3 M, manifesting the rationalities and validities of as-proposed guidelines.

DOI： 10.1016/j.apcatb.2020.119589

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85092227918&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

We selected ruthenium (Ru) to improve the photocatalytic activity of a WO3/ZrO2 composite. The synthesized Ru/WO3/ZrO2 was then compared to a benchmark photocatalyst (S-TiO2) in terms of photocatalytic disinfection of raw surface waters collected from the Nile Delta region, Egypt. The photocatalysts were immobilized on aluminum plates with polysiloxane to test them in repetitive cycles under the irradiation of a metal-halide lamp. Bacterial concentrations in the raw waters ranged from 300 to 5000 CFU/mL (CFU: colony-forming units) and different species and genus were detected including gram-negative (e.g., shigella, salmonella, vibrio parahaemolyticus, and vibrio cholera) and gram-positive bacteria (e.g., enterococcus). Ru/WO3/ZrO2 deactivated over 90 % of the bacterial content within 120 min for most sources, whereas S-TiO2 did not perform as highly. The bacterial count after 240 min of irradiation was below the detection limit for all different water sources. Moreover, the inhabitation of photocatalytic disinfection by natural organic matter (NOM) was investigated. Ru/WO3/ZrO2 was stable for four continuous cycles (960 min in total), suggesting the viability for practical application.

DOI： 10.1016/j.jhazmat.2020.123514

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85088370306&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Photocatalytic degradation by the titanium dioxide (TiO2) photocatalyst attracts tremendous interest due to its promising strategy to eliminate pollutants from wastewater. The floating photocatalysts are explored as potential candidates for practical wastewater treatment applications that could overcome the drawbacks posed by the suspended TiO2 photocatalysis system. The problem occurs when the powdered TiO2 applied directly into the treated solution will form a slurry, making its reuse become a difficult step after treatment. In this study, the immobilization of titanium dioxide nanoparticles (TiO2 NPs) on the floating substrate (cork) employing polyvinyl alcohol (PVA) as a binder to anchor TiO2 NPs on the surface of the cork was carried out. Characterizations such as Fourier transformer infrared, X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-vis), zeta potential, photoluminescence spectroscopy, femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy, ion chromatography, and scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX) analyses were employed. XRD analysis revealed the formation of anatase-phase TiO2 NPs. The results demonstrated that the crystallite size was 9.36 nm. The band gap energy of TiO2 NPs was determined as 3.0 eV. PL analysis verified that TiO2 NPs possessed a slower recombination rate of electron-hole pairs as compared to anatase TiO2. The result was attributed by the behavior of photogenerated charge carriers on TiO2 NPs, which existed as shallowly trapped electrons that could survive longer than a few milliseconds in this study. Furthermore, SEM-EDX analysis indicated that TiO2 NPs were well distributed on the surface of the cork. At the optimal mole ratio of TiO2/PVA (1:8), the TiO2/PVA/cork floating photocatalyst degraded at 98.43% of methylene blue (MB) under a visible light source which performed better than under sunlight irradiation (77.09% of MB removal) for 120 min. Besides, the mineralization result has measured the presence of sulfate anions after photocatalytic activities, which achieved 86.13% (under a visible light source) and 65.34% (under sunlight). The superior photodegradation performance for MB was mainly controlled by the reactive oxygen species of the superoxide radical (•O2-). The degradation kinetics of MB followed the first-order kinetics. Meanwhile, the Langmuir isotherm model was fitted for the adsorption isotherm. The floating photocatalyst presented good reusability, resulting in 78.13% of MB removal efficiency even after five cycles. Our TiO2/PVA/cork floating photocatalyst fabrication and high photocatalytic performance are potentially used in wastewater treatment, especially under visible light irradiation.

DOI： 10.1021/acsomega.1c01458

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85108058122&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Fundamental studies involving divalent ion intercalated graphene-based hydrogel are still lacking in terms of their adsorption behavior towards dye pollutants. In this study, we prepared a self-assembled Mg2+ and Ca2+ intercalated reduced graphene hydrogel (rGH) using hydrothermal treatment to evaluate the intercalation impact on the adsorption capability towards cationic dyes, methylene blue and rhodamine B. The morphological, structural, thermal, and textural properties of the divalent ion intercalated reduced graphene hydrogels were studied using Fourier transform infrared spectrometer, thermogravimetric analysis, Raman spectroscopy, scanning electron microscope-energy dispersive spectroscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett– Teller surface area analysis, and X-ray diffraction. The increased adsorption capacity of the divalent ion intercalated reduced graphene-based hydrogels towards the dye molecules resulted from the increase in the specific surface area and pore volume due to the Mg2+ and Ca2+ bridging that formed spaces between the graphene sheets framework. Adsorption kinetics and the equilibrium adsorption isotherm were fitted by a pseudo-second-order alongside intraparticle diffusion kinetic models and Langmuir isotherm respectively. In addition, the divalent ion intercalated reduced graphene hydrogel showed good generation after three cycles of simultaneous adsorption.

DOI： 10.3390/pr9010169

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85099850101&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Broad-spectrum light activation in photocatalytic materials is considered vital for effective solar-to-hydrogen energy conversion. Here, we propose an upconversion process in oxygen-doped polymeric carbon nitride (C3N4) nanosheets, resulting in high photocatalytic activity for hydrogen generation from water splitting under infrared light irradiation. Due to the upconversion, the photoexcited electrons are transferred to the conduction band, and a σ* carbon-oxygen orbital localized on the triazine matrix ring resulting from oxygen doping extends the lifetime of photogenerated electrons, which increases the photocatalytic activity under both infrared and visible light. Our material exhibits high apparent quantum efficiency of 0.014% and 23% at 850 nm and 420 nm, respectively. Under infrared light (λ ≥ 800 nm, 24 mW cm−2), the hydrogen production rate of our material is 22.84 μmol h−1 g−1, which can reach a yield similar to that of pristine C3N4 under visible light.

DOI： 10.1038/s43246-020-00093-z

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85105046245&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Copyright © 2020 American Chemical Society. The brookite phase of TiO2 is much less explored than the other two polymorphs, rutile and anatase, despite its potential applications in photo-catalytic CO2 reduction and water splitting. The first hydration layer and surface hydroxyl groups on the brookite (210) surface and their structural changes under photo-irradiation have been considered to play significant roles in such applications. Hence, in this work, we focus on studying them at the atomic scale using a combination of liquid-environment frequency modulation atomic force microscopy (FM-AFM) and density functional theory (DFT) calculations. The striped feature found in AFM images and its photo-switching behavior accompanied by photo-increased surface hydrophilicity are revealed by ab initio molecular dynamics simulations to originate from photo-sensitive two-dimensional arrangements of molecular and dissociative H2O and proton-hopping behavior. The formation mechanism of the arrangements is further clarified by DFT static and nudged-elastic-band calculations.

DOI： 10.1021/acs.jpcc.0c05151

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85092476284&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020 Elsevier B.V. Photocatalytic production of H2O2 from water and oxygen utilizing polymetric carbon nitride (PCN) is a promising alternative to the energy-consuming anthraquinone method. However, insufficient oxidation potential and limited light-absorption have restricted its further improvement. Herein, PCN with sufficient oxidation potential and improved visible-light usage (up to 550 nm) was prepared by co-polymerization of 2,5,8-triamino-tri-s-triazine (melem) and barbituric acid (BA). With the loading of Na2CoP2O7 as a water-oxidation co-catalyst, this novel PCN system showed a record-high apparent quantum efficiency (420 nm) of 8.0 % and a solar-to-chemical conversion efficiency of 0.30 % for H2O2 production. This improvement is attributed to the introduced O 2p states by C[dbnd]O groups remained in the PCN matrix, leading to a positive valence band maximum of 1.85 eV (vs. SHE). The co-polymerization of BA and melem combined with Na2CoP2O7 loading also suppressed the charge recombination, resulting in a rapid stepwise one-electron to one-electron reaction for efficient H2O2 production.

DOI： 10.1016/j.apcatb.2020.118917

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85082764240&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry. In this work, various amounts of Ce were added to TiO2 to form a mixed oxide support; CexTi1-xO2 (x = 0, 0.003, 0.05, 0.10 and 0.15) and then those synthesized supports were impregnated by 10 wt% Ni to produce a catalysts. The 10 wt% Ni-CexTi1-xO2 (x = 0, 0.003, 0.05, 0.10 and 0.15) catalysts were tested for CO2 methanation reaction by using a fixed-bed reactor in the temperature range of 100-500 °C. The sample was pretreated at 450 °C under H2 and then a mixed feed gas of CO2 and H2 was switched into the reactor to start the reaction. The results showed that 10 wt% Ni-Ce0.003Ti0.997O2 catalyst (the lowest Ce content) exhibited the highest CO2 conversion and CH4 yield. Moreover, 10 wt% Ni-Ce0.003Ti0.997O2 showed highly stable during the stability test (50 h.). The results indicated that upon addition of small amount of Ce into TiO2-supported Ni, the surface, structural, electrical and redox properties of the catalyst were improved to the extent that these properties can promote the catalytic activities for CO2 methanation. The Ce addition can improve the CO2 methanation catalytic activity by several ways. First, higher dispersion of Ni on catalysts surface upon addition of Ce was observed which resulted in higher adsorption rate of H2 on this metal active site. Second, formation of a larger amounts of oxygen vacancies as well as basicity improvement upon addition of Ce were occurred which can increase the CO2 adsorption on catalyst surface. Third, incorporation of Ce resulted in improving of a starting reduction temperature of Ni2+ to Ni0 for TiO2-supported Ni catalyst which can indicate that the reducibility of Ce-doped TiO2-supported Ni catalyst was enhanced and then alter its catalytic activity. However, increasing of Ce content led to lowering of CO2 methanation activities which resulted from increasing of basicity by Ce addition. The excess amounts of adsorbed CO2 would lead to competitive adsorption to H2 and then lead to a decrease of catalytic activity. Therefore, an appropriate amount of H2 and CO2 adsorption ability on catalyst surface was a prominent factor to dominate the catalytic activity.

DOI： 10.1039/d0ra04934d

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85089420275&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020, Springer Science+Business Media, LLC, part of Springer Nature. The solid residue of Japanese citron after its compression to obtain juice and then the extraction of oil was used as the raw material of activated carbon in order to substantiate the cascading use of Citrease for several high value products. Most of the inorganic compounds in the carbonized samples were K4H2(CO3)3·1.5 H2O and CaCO3. Although the amount of these inorganic compounds was independent of the carbonization temperature, most of these inorganic compounds were removed by the KOH activation process. The BET specific surface area of the sample after the KOH activation increased with the increasing amount of KOH added for activation, and the value was greater than 1900 m2 g−1 when the amount of KOH was greater than 67 wt%. The pore sizes and pore volumes were calculated by several methods, such as the Langmuir, t method, αs method, MP method, BJH method, and INNES method, in order to analyze in detail the surface condition related to the pores. The capacitance value of the sample activated at KOH 75 wt% was 157 F g−1 at 1 mV s−1.

DOI： 10.1007/s10934-019-00855-2

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85077575632&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim CeO2 doped with various rare earth (RE) ions (Sm, Y, La and Nd) having a broom-like hierarchical structure was successfully prepared by a template-free hydrothermal method. The photooxidation performance of RE-doped products was significantly better than that of pure CeO2, and comparative experiments showed that Sm-doped CeO2 (SC) has superior photooxidation activity, resulting about 3.0-times and 8.5-times higher activities of bisphenol A (BPA) degradation and of acetaldehyde (CH3CHO) decomposition, respectively, than those of pure CeO2. Due to the incorporation of RE ions, the surface exposed cerium ions are partly substituted by those cations, resulting in a higher concentration of oxygen vacancies (Ov) in RE-doped CeO2. The increased Ov can act as a trapping center for photo-generated electrons to form a doping transition state between the conduction band (CB) and valence band (VB), which can restrict the recombination rate of electrons and holes effectively and lead to an outstanding enhancement of photooxidation performance. Furthermore, abundant highly reactive hydroxyl radicals (.OH) and superoxide radicals (.O2−), which are efficient intermediates with vivid oxidation ability, can further enhance the photocatalytic activity of RE-doped CeO2. A cost-effective strategy for designing CeO2-based semiconductor photocatalysts doped with multitudinous RE ions that have enhanced photooxidation performance is presented in this paper.

DOI： 10.1002/cctc.201902309

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85082747506&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020 Elsevier Ltd The mass transport limitations encountered in classical H-cells for electrochemical CO2 reduction reaction (CO2RR) have spurred research in gas diffusion electrode (GDE) systems. However, current reports on CO2RR required large biases (anode potential vs. cathode potential > -2.0 V) for high current efficiencies. In this work, we combined a TiO2 photoanode and a GDE modified with a Co, Ni or Sn metal phthalocyanine (MPc) catalyst to reduce the external bias requirement for CO2RR. We found the Faradaic efficiencies and the selectivity of the photoelectrolysis products were influenced by (i) the metal cation (Ni, Co or Sn) coordinated to the phthalocyanine, (ii) the electrolyte temperature and concentration and (iii) the magnitude of the applied bias. In addition, analyzes of the voltage distributions between the TiO2 photoanode and the MPc-GDE revealed the current efficiency of the TiO2/MPc-GDE cell was limited predominantly by a high ohmic polarization loss at the TiO2 photoanode due to an excessive thickness of the TiO2 layer. The cathodic process at the MPc-GDE was governed by the activation energy of the electrode. The thickness of the TiO2 photoanode was subsequently optimized for higher current efficiency. The highest Faradaic efficiency for PEC CO2RR was obtained when a NiPc catalyst was utilized as the CO2RR catalyst and the optimum cell conditions were as follows: (i) a GDE electrolyte temperature of <11 °C, (ii) a GDE electrolyte concentration of >1 M aq. Na2SO4 electrolyte solution and (iii) a TiO2 oxidation time of 3 h. Using these optimized cell conditions and under UV illumination, the as-prepared TiO2/NiPc-GDE cell shows a notably high CO2RR Faradaic efficiency and selectivity for CO (at 98%) and at a lowest reported cell bias of 0.8 V (anode potential vs cathode potential). This work provides an improved understanding of the cell designs of a vapor-fed CO2RR reactor based on a TiO2/MPc-GDE photoelectrochemical system.

DOI： 10.1016/j.electacta.2020.135805

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85079238721&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier Ltd In this study, photocatalytic degradation of trimethoprim by synthesized S-TiO2 and Ru/WO3/ZrO2 catalysts was investigated. Both photocatalysts have been immobilized on circular aluminum plates by polysiloxane to investigate their reusability performance. The morphology and structure of the catalysts were studied by high-resolution transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. The photocatalytic experiments were carried out using suspended and attached catalysts using a metal halide lamp as a light source. The degradation efficiencies of trimethoprim were 100% and 98.2% at catalyst dose of 0.5 g/L, pH of 7.0 and irradiation time of 240 min using suspended Ru/WO3/ZrO2 and S-TiO2, respectively. After immobilization of the catalysts on the aluminum plates, the removal efficiencies in five repetitive cycles were 98%, 96.9%, 96.8%, 93.2% and 83.4% using Ru/WO3/ZrO2, while they were 88.6%, 86%, 84%, 78% and 75.9% in case of S-TiO2. The irradiation time of each cycle was 240 min, and the initial trimethoprim concentration was 10 mg/L. The degradation rates of trimethoprim were estimated in the case of suspended and immobilized S-TiO2 and Ru/WO3/ZrO2. The radical trapping experiments using various scavengers revealed that superoxide radicals, holes and hydroxyl radicals all participated in the photo-degradation process. Furthermore, the transformation products generated during the trimethoprim oxidation process were detected by liquid chromatography/mass spectroscopy to identify the possible degradation pathways.

DOI： 10.1016/j.jwpe.2019.101023

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85074269909&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Canadian Society for Chemical Engineering Dense photocatalyst slurry was employed for the synthesis of p-anisaldehyde under solar light irradiation. An Fe-modified rutile TiO 2 (Fe-TiO 2, 34.5 m 2/g) photocatalyst was used as a visible-light-responsive photocatalyst. A conventional TiO 2 (P25, 35 m 2/g) photocatalyst was also examined as a reference catalyst. XRD patterns and diffuse reflectance spectra showed that Fe-TiO 2 consists of 100 % rutile phase and absorbs more visible light compared to P25, respectively. The catalyst powder was suspended in an ethyl acetate solution of p-methoxytoluene in the mini-reactor, with oxygen bubbling, under a solar simulator, visible light, and UV LEDs. p-anisaldehyde, as a reaction product, was analyzed by sampling using gas-chromatograph. Regardless of the light source, Fe-TiO 2 always outperformed P25 in terms of both generation rates (GR) of p-anisaldehyde and energy requirements (ER). It was demonstrated that the highly dense Fe-TiO 2 slurry was efficient for the synthesis under solar light owing to the small size of the reactor. The small amount of Pt and ZrO 2 cocatalysts significantly enhanced the GR under solar light. By adopting a visible light responsive Fe-TiO 2 photocatalyst, the mini slurry-bubble reactor under solar light achieved a high GR per catalyst mass (CM), which is one to two orders higher than that reported by most previous studies with high-power lamps.

DOI： 10.1002/cjce.23586

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85071253386&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Morphology-controlled rutile titanium(IV) oxide (TiO2) and anatase TiO2 were prepared by a hydrothermal method and their surfaces were selectively loaded with Au, Ag and AuAg bimetallic nanoparticles (NPs) by photo-deposition in order to obtain visible-light responsive photocatalysts. With the help of local surface plasmon resonance (LSPR) of noble metal NPs, the photocatalytic activity of noble metal-loaded TiO2 under visible-light irradiation was improved compared to that of bare TiO2. The enhancement of LSPR on the photocatalytic activity of rutile TiO2 was larger than that of anatase TiO2 with optimum amount of Au or AuAg. In addition, the reusability (stability) of AuAg-loaded TiO2 was much better than that of Ag-loaded TiO2. Double-beam photoacoustic results confirmed different trap energy level distribution lead to different electron transfer ways, resulting in different oxidizing capabilities and they gave one of important strategies for designing visible-light responsive TiO2.

DOI： 10.1002/cctc.202000366

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85085870770&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier B.V. In designing of carbon nitride-based Z-scheme systems, band structure engineering of graphitic carbon nitride (g-C3N4) is unquestionably a crucial demand but paid rare attention to. Here, the broadened light absorption and charge transfer on sub gaps induced by thermal defects in defect-rich carbon nitride (d-C3N4) are simultaneously utilized to engineer a novel and more efficient Z-scheme system. The as-prepared α-Fe2O3/d-C3N4-1 exhibits dramatically improved photocatalytic degradation rate for tetracycline compared withα-Fe2O3/g-C3N4-1 under visible light. Dye photosensitization effect on photocatalytic reaction was ruled out, and the tetracycline decomposition mechanism was proposed. The efficiently restrained charge recombination and broadened light absorption in this Z-scheme system are key parameters of the outstanding photocatalytic activity. This proposed mechanism has the potential to push the limit of traditional carbon-nitride-based Z-scheme photocatalysts and can also shed substantial light on the engineering strategies for other polymeric Z-scheme photocatalysts.

DOI： 10.1016/j.apcatb.2019.118145

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85071888981&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier B.V. Morphology-controlled brookite TiO 2 nanorods loaded with AuAg bimetallic nanoparticles were synthesized by a facile photoreduction process to develop visible-light-responsive photocatalytic performance. The AuAg bimetallic nanoparticles provide good stability and excellent localized surface plasmon resonance (LSPR) effect. Moreover, the AuAg bimetallic nanoparticles were selectively deposited on the reduction facets of brookite TiO 2 nanorods, facilitating the charge separation. As expected, the as-prepared AuAg-TiO 2 nanorods showed enhanced visible light harvesting and decreased electron-hole recombination, resulting in superior visible-light-responsive photocatalytic performance. When the loading amount of AuAg nanoparticles was controlled at 0.5 wt%, the AuAg-TiO 2 nanorods yield 102 ppm acetone with visible-light irradiation for 5 h, far exceeding than those of bare brookite TiO 2 nanorods.

DOI： 10.1016/j.apcatb.2019.01.016

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060114171&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 In this study, yttrium-doped CeO 2 was introduced into polymeric carbon nitride (PCN) through one-step hydrothermal reaction to form the Y-doped CeO 2 /PCN (YCC) nanocomposited photocatalysts. Morphology of products was observed by emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM). The structure of the products was characterized by X-ray diffractometer (XRD), FT-IR and Raman analysis. Optical absorption and band energy properties were investigated by UV–vis, PL and VB-XPS spectra. The X-ray photoelectron spectroscopy (XPS) results further revealed that the surface active oxygen and Ce 3+ concentration of nanocomposited photocatalyst were significantly increased compared with pure CeO 2 and PCN counterparts. The YCC composites exhibited excellent photoredox performance under visible light irradiation, affording to 5.73- and 3.74-fold higher for RhB degradation and proton photoreduction to produce H 2 than that of pure CeO 2 . The Y-doped nanocomposited means adopted in this study not only improve the optical utilization of visible light, but also effectively inhibit the recombination of photogenerated charge carriers, which are conducive to promote the photoredox performance synergistically.

DOI： 10.1016/j.apcatb.2018.10.057

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056177461&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, The Minerals, Metals & Materials Society. Activated carbon derived from cellulose with added melamine sulfate, which is known as one of the chemicals having a flame-retardant effect on the cellulose, was produced in order to dope dual hetero elements, such as nitrogen and sulfur, and was used to improve the yields of the carbonization process and carbon dioxide (CO 2 ) activation process. The addition of melamine sulfate resulted in suppression of the BET specific surface area. The Brunauer–Emmett–Teller (BET) specific surface area for the CO 2 -activated sample with 30 wt.%-added melamine sulfate was 578 m 2  g −1 . The existence of nitrogen atoms was confirmed in the CO 2 -activated sample with the added melamine sulfate. However, no peak assigned to the sulfur atom appeared in the x-ray photoelectron spectroscopy spectrum for the sample with the 30 wt.%-added melamine sulfate. In spite of the lower specific surface area of the samples containing the added melamine sulfate, the capacitance values of the carbon material derived from the cellulose with added melamine sulfate were higher than those of the carbon material derived only from cellulose.

DOI： 10.1007/s11664-018-6799-z

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056668631&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 American Chemical Society. Direct conversion of methane (CH 4 ) into valuable chemicals with low-energy input is an important goal in the sustainable chemical industry. Herein, we report a photoelectrochemical activation of CH 4 in the gas phase under visible light irradiation at room temperature. The proof-of-concept study revealed that homocoupling of CH 4 to form ethane (C 2 H 6 ) with high selectivity of 54% was induced by photogenerated holes over a tungsten trioxide (WO 3 ) gas-diffusion photoanode coated with a proton-conducting ionomer in the presence of water vapor. The gas-electrolyte-solid triple-phase boundary enables the oxidation of the inert carbon-hydrogen bond of CH 4 , and the formation of carbon oxides and ethane with a carbon-carbon bond. The gas-phase photoelectrochemical system shows incident photon-to-current conversion efficiency of 11% under blue light at an applied voltage of 1.2 V. This work is also the first demonstration of a visible-light-driven hydrogen evolution from CH 4 . The hydrogen is separated from CH 4 and oxidized products by a solid polymer electrolyte membrane.

DOI： 10.1021/acsenergylett.8b02436

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85060587908&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Although semiconductor photocatalysis has been investigated actively for a long time, control of dark processes successive to electron transfer from photocatalysts is almost unexplored compared with designing photocatalysts themselves. The present study proposes employment of clay particles as for controlling the dark processes independently of semiconductor photocatalyst particles. We employed niobate–clay binary nanosheet colloids, where colloidal niobate and clay nanosheets are spatially separated at a micrometer level. Niobate nanosheets worked as the semiconductor photocatalyst that released electrons upon UV excitation, and clay nanosheets worked as the turnout switch of the released electrons to determine their destination. When methylviologen (MV2+) molecules that accept the electrons released from niobate were adsorbed on clay nanosheets, reduction of MV2+ predominantly occurred, and hydrogen was little evolved from the colloid. When Pt nanoparticles were deposited on clay nanosheets, photocatalytic hydrogen evolution occurred because Pt loaded on the clay nanoparticles played a role of cocatalyst. When MV2+ and Pt were co-loaded on clay nanosheets, both of MV2+ reduction and hydrogen evolution occurred competitively. The photocatalytic hydrogen evolution carried out by stirring the colloid sample was worse than that conducted without stirring, which indicated positive contribution of the spatial separation of photocatalytic niobate and cocatalytic clay nanosheets.

DOI： 10.1016/j.apcatb.2018.09.047

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85054041105&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 The Royal Society of Chemistry. Photoelectrochemical (PEC) decomposition of water at room temperature and separation of hydrogen and oxygen has been achieved using a solid-state cell with a proton exchange membrane (PEM). The PEM-PEC cell can use water vapor instead of liquid aqueous electrolytes for solar hydrogen production. In this study, we aimed to evaluate the performance of thermally oxidized rutile TiO2 layers on titanium microfiber felt for the photoanodic oxidation of water vapor in the gas phase. We investigated the effects of perfluorosulfonic acid ionomer coating, the wavelength and intensity of incident UV light, and external electric bias on the photocurrent density of TiO2 photoanodes in a humidified gaseous condition. The gas-phase PEC performance of the rutile TiO2 thin layer electrode was much higher than that of the anatase TiO2 nanotube array electrode under 385 nm UV illumination at high irradiance (40 mW cm-2). The H2 evolution rate in the PEM-PEC cell using a rutile TiO2 layer as an oxygen-evolving photoanode was 330 μmol h-1 under 385 nm UV (irradiation area 16 cm2) at an applied voltage of 1.2 V.

DOI： 10.1039/c9se00292h

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85069755458&origin=inward

担当区分：最終著者   記述言語：日本語   掲載種別：記事・総説・解説・論説等（学術雑誌）

<p>我々は、独自に開発した原子間力顕微鏡をベースとする液中局所電位分布計測技術により、触媒、金属表面においてナノスケールで生じる反応分布を可視化してきた。また、これまで測定された電位分布からその電位起源が固液界面の溶液電位差にあることを仮説とし、それを実証してきた。本講演では、それらの結果と本計測技術が電極表面において電荷蓄積のメカニズムを解析するために有用であることを新たに示す。</p>

DOI： 10.14886/jvss.2019.0_3Ca04S

CiNii Article

CiNii Research

その他リンク： https://ci.nii.ac.jp/naid/130007737728

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd In this work, a highly visible light active and reusable photocatalyst was synthesized by incorporation of sulfur cations into the lattice of titanium dioxide (TiO2). The prepared photocatalyst was immobilized on aluminum plates by polysiloxane for repetitive use in photocatalysis experiments. Suspended and attached catalysts were used for degradation of 2,4-dichlorophenol (2,4-DCP) under direct irradiation of a metal halide lamp. In contrast, the degradation of 2,4-DCP by suspended catalyst was faster than attached catalyst. However, the trends of degradation rates by attached catalyst indicate that the mineralization of 2,4-DCP could be extended for additional time to attain the same efficiency of suspended catalyst. At initial concentration of 25 mg.L−1 the degradation efficiency of 2,4-DCP was higher than 97% after 480 min. The degradation rates in five consecutive cycles were 98%, 96%, 90%, 86%, and 80.4% indicating high reusability and stability of the catalyst even after long periods of photocatalytic reaction. The photocatalytic degradation rates of 2,4-DCP by suspended and attached catalysts were described by Langmuir–Hinshelwood kinetic model.

DOI： 10.1016/j.jwpe.2018.11.001

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056239765&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd In the study, the catalytic edge reactivity on porous Zn electrode has successfully visualized through the electrochemical CO2 reduction to CO. It is well known that the activity of a CO2 reduction reaction catalyst depend on the type of material and surface nano-structure. Consequently, numerous researchers are interested in the relation between the catalyst activity and surface conditions such as morphology, oxidation state, and crystal orientation. However, it is difficult to explain the mechanisms of catalytic CO2 reduction and visualize the catalytic activity. Our results demonstrate, that this strategy not only improved the selective CO production, but also helped visualize the catalytic reactivity on the edge site via open-loop electric potential microscopy (OL-EPM). The obtained OL-EPM image strongly suggests that the edge site of porous Zn acts as an efficient reactive site in the CO2 electrochemical reduction reaction.

DOI： 10.1016/j.electacta.2018.09.080

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85054609077&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 American Chemical Society. Direct imaging of atomic-scale surface structures of TiO2 nanoparticles is a promising method for understanding the detailed mechanism of their photocatalytic activities. Atomic force microscopy (AFM) is one of the analytical tools used for direct imaging of surfaces, but atomic-scale AFM studies of TiO2 nanoparticles in liquid have not been reported. Here, we report two methods for fixing of TiO2 nanocrystals: an electrostatic method and a cross-linking method. Both methods enabled visualization of subnanoscale surface structures of brookite TiO2 nanoparticles in liquid by frequency modulation AFM (FM-AFM). The FM-AFM imaging results and density functional theory molecular dynamics calculations suggest that the subnanoscale structures in the FM-AFM images can be explained by the arrangement of the surface topmost atoms or their hydration structures on the brookite TiO2(210) surface. Our results open up various possibilities for studying atomic-scale surface structures of nanoparticles in liquids by AFM.

DOI： 10.1021/acs.jpcc.8b06262

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055266152&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The hydrothermal method is widely applied in nanomaterials synthesis, and most of the influencing factors have already been taken into account. However, the effect of atmosphere in solution on the performance of nanomaterials has been underestimated for a long time. In this article, reaction solvents were saturated with three classical gases (argon, oxygen, and carbon dioxide), and then heated at 180 °C for 24 h to obtain the cerium dioxide (CeO2) nanoparticles. The properties of the three types of CeO2 are significantly different from that of the normal CeO2 (without gas saturation). The morphologies of the prepared CeO2 particles are different, even appear the hollow structure in CeO2−CO2 (synthesized in CO2 saturated condition). The more absorbing and meaningful thing is that the photocatalytic activity of CeO2−CO2 has been greatly improved. The concordance of the CO2 atmosphere (acid gas) and CeO2 (owning substantial content of basic sites) is the key point for the excellent photocatalytic performance.

DOI： 10.1002/cctc.201800659

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85052558505&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. A hydrogen bond-based heterojunction photocatalyst, g-C 3 N 4 /melamine-cyanurate (gMC), was synthesized by a facile alkaline hydrothermal approach. The hydrogen bonds between the two substrates (N–HO[dbnd]C) provide not only an ultrafast pathway (hundreds of femtoseconds) but also an inner electric field for hole transfer from g-C 3 N 4 to melamine-cyanurate. Although only the g-C 3 N 4 moiety acts as a photocatalyst, the optimized composite presents approximately 5.4, 3 and 2.5 times higher photocatalytic activity than bulk g-C 3 N 4 in the decomposition of acetaldehyde and 2-propanol and the generation of H 2 by water splitting, respectively. In this paper, we demonstrate that hydrogen bonds can not only lower the interfacial barrier and separate redox sides but also control the direction of charge transfer, which enables the design of the photocatalytic mechanism.

DOI： 10.1016/j.apcatb.2018.04.057

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85046081031&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. Constructing heterojunction between two semiconductors is a cost-effective pathway to fabricate efficient photocatalysts for environmental remediation and energy-related applications, which is with profound significance and high desirability to contemporary era. In this work, we demonstrate an extremely facile approach to couple bismuth subcarbonate with polymeric carbon nitride (denoted as BIOC@PCN) by ion exchange between home-made rose-like Bi2O2(OH)(NO3) (denoted as BION) and PCN bulks at 433 K solvothermal condition. PCN bulks play multi-roles in this ingenious one-pot method. Firstly, PCN bulks guarantee the negatively charged surface to anchor plentiful bismuth precursor salts. More importantly, solvothermal treatment affords a weak basic and sufficient CO32−ions environment to promote the following ion exchange reaction. The evolution of morphology, components and structure from rose-like BION to BIOC@PCN were symmetrically characterized by means of SEM, HR-TEM, XRD, FTIR, TG, UV–vis, BET-BJH and XPS. The as-prepared nanohybrid photocatalyst (0.5BIOC@PCN) presents optimal photocatalytic performance for gaseous acetaldehyde removal, which is showing 10, 6.5 and 2 times higher than that of the PCN-Bulk, BION and mechanical mixed BIOC/PCN counterparts, respectively. Transient photocurrent response and EPR results further verify the validity of the established heterojunction of BIOC@PCN in facilitating the separation of charge carriers. The performance improvement gains from the efficient separation of charge carriers in BIOC@PCN heterojunction, manifested by PL spectra, transient photocurrent response and EPR results. In this study, a facile and cost-effective approach to build PCN-based nanohybrid photocatalysts for gaseous acetaldehyde efficient removal was established.

DOI： 10.1016/j.cattod.2018.03.071

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85044869538&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, Springer Science+Business Media, LLC, part of Springer Nature. The cascade use of bamboo as the raw material for high-value products, that is, the production of xylo-oligosaccharide and the preparation of activated carbon for EDLC electrode, was proposed as an economically effective use of bamboo in this study. Xylo-oligosaccharides, such as xylobiose and xylotriose, were successfully produced from bamboo in a water solution by a hot compressed water process. The solid residue of bamboo after the treatment of the hot compressed water was carbonized at 400–800 °C, then activated with KOH. The KOH activation was effective for the preparation of activated carbon having a high BET specific surface area of ca. 2600 m2 g−1from the solid residue. The amount of ash drastically decreased by the hot compressed water treatment, which should be an advantage as the precursor for EDLC electrodes. The capacitance values measured in a 1 M H2SO4aqueous solution of the activated carbon derived from the solid residue compared well with those from the bamboo.

DOI： 10.1007/s10934-018-0567-6

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85040650559&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. A composite photocatalyst composed of carbonaceous material and g-C3N4is fabricated by a simple thermal treatment of melamine (hydrothermally treated melamine) with cellulose acetate. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and elemental analysis data reveal the formation of carbonaceous material in the composites. The photocatalytic activity was evaluated by the H2liberation rate from water splitting under visible-light irradiation. The optimized composite, which is prepared from the precursor of hydrothermally treated melamine with cellulose acetate, shows 35 times higher photocatalytic activity than bulk g-C3N4(melamine as the precursor) and a quantum efficiency of 1.05% (0.01 g of catalyst) under irradiation at 420 nm. The enhancement of the photocatalytic activity is ascribed to the unique electronic properties of the carbonaceous material, the enlarged specific surface area and the improved light absorption.

DOI： 10.1016/j.cattod.2018.03.012

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85043996414&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Inc. Black TiO2 samples with different concentrations of Ti3+ on the surface were fabricated by heat treatment in air. After heat treatment, the concentrations of Ti3+ on the surface of black TiO2 samples decreased and a layered structure was not observed. Oxygen vacancies were demonstrated to be the origin of visible light absorption. Ti3+ oxidation on the surface of black TiO2 samples caused the decrease of oxygen vacancies. In addition, black TiO2 samples with different Ti3+ concentrations showed differences in visible light absorbance, band gap, fate of photogenerated electrons, and photocatalytic activity. The optimum concentration of Ti3+ for achieving is shown to be the highest photocatalytic activity under the irradiation of visible light.

DOI： 10.1016/j.jcat.2018.07.018

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85052756898&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.cattod.2018.06.040

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85049619095&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 We fabricated a CZTS electrode by the sol-gel and spin-coating method on an Mo/glass substrate and performed photoelectrochemical (PEC) reduction of nitrobenzene (NB) in an aqueous environment under visible light irradiation (420 < λ < 800 nm). By using the CZTS electrode, a six-electron reduction reaction of NB to aniline (AN) proceeded in an aqueous solution under visible light irradiation. We found that NB reduction reaction was strongly dependent on the electrode potential; large cathodic polarization is kinetically favorable for hydrogen evolution over a CZTS electrode, which leads to hindrance of the PEC NB reduction reaction, resulting in a decrease in the yield of AN ( < 20%). At small cathodic polarization, conversion of NB reached to > 99% and the yield of AN was calculated to be > 50%. Moreover, we found that the proton concentration in an aqueous electrolyte had a significant effect on the PEC NB reduction reaction. In this study, we investigated the PEC NB reduction reaction over a CZTS electrode in conjunction with the structural and optical properties.

DOI： 10.1016/j.apcatb.2017.12.021

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85037990084&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Photocatalysts that are responsive to visible light are necessary to utilize solar energy. We prepared reduced CeO2−x with absorption in the visible region by a simple solvothermal method. A new absorption band appearing at λ≈500 nm (surface plasmon resonance) could be ascribed to the high content of Ce3+. To elucidate the relationship between Ce3+ and activity, the decomposition of isopropyl alcohol (IPA) to generate acetone was performed under visible‐light irradiation. CeO2−x showed activity that was superior to that of pure CeO2. Ce3+ induced oxygen vacancies in the lattice of CeO2−x, and this resulted in an improvement in the activity. In addition, the introduction of Ce3+ resulted in an improvement in the absorption of CeO2−x in the visible‐light region. Also, the appearance of small tentacles (Confeito‐like) on the surface of CeO2−x not only provided more active sites but also prevented aggregation. Owing to its visible‐light responsiveness and unique morphology, the performance of this material was significantly improved relative to that of pure CeO2.

DOI： 10.1002/cctc.201701767

Kyutacar

Scopus

その他リンク： https://onlinelibrary.wiley.com/doi/abs/10.1002/cctc.201701767

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 We synthesized two different polymorphs (monoclinic and orthorhombic phases) of CuNb 2 O 6 as a d 0 –d 9 photocatalyst by a solid-state reaction route and performed photocatalytic H 2 evolution from water under AM 1.5G solar light irradiation. The monoclinic phase (P21/c) was transformed to the orthorhombic phase (Pcna) at ambient temperature ( > 700 °C), and XRD data revealed that the direct environment of octahedral sites was occupied by Cu 2+ cations. The difference in the local crystal structure of the CuO 6 octahedral in the two polymorphs of CuNb 2 O 6 was closely related to the optical absorption property. For monoclinic CuNb 2 O 6 , the optical band gap transition was a metal-to-metal charge transfer between Cu 2+ and Nb 5+ , and d-d absorption of Cu 2+ was a forbidden transition by the Laporte selection rule due to its symmetric CuO 6 octahedral. For orthorhombic CuNb 2 O 6 , d-d absorption of Cu 2+ was partially allowed because of its distorted CuO 6 octahedral. We experimentally revealed that d-d absorption of Cu 2+ contributed a significant effect on the photocatalytic activity of both polymorphs of CuNb 2 O 6 ; the photocatalytic activity of the monoclinic phase was insensitive to d-d transition in Cu 2+ ions, while the photocatalytic activity of the orthorhombic phase was strongly influenced by d-d transition in Cu 2+ ions because an electron configuration as d 9 readily induces structural distortion by Jahn-Teller effects in an octahedral crystal field. The distortion was avoided by trapping photo-generated electrons, leading to a decrease in photocatalytic activity. We discuss the photocatalytic activities of both polymorphs of CuNb 2 O 6 in conjunction with structural, optical and electrochemical properties. We also show that a deposition of platinum nanoparticles on CuNb 2 O 6 further improved the photocatalytic activity.

DOI： 10.1016/j.jphotochem.2017.12.039

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85040246074&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 the Owner Societies. Brookite TiO 2 attracts considerable attention in photocatalysis owing to its superior performance in several photocatalytic reactions. In this work, we investigated the behavior of charge carriers in brookite, rutile, and anatase TiO 2 by using photoluminescence (PL) and transient absorption (TA) spectroscopies. PL measurements revealed that brookite TiO 2 exhibits a visible and a NIR emission at ∼520 nm and ∼860 nm, respectively. Addition of methanol vapor quenched both the visible and NIR emissions by the hole-consuming reaction of methanol. However, exposure to O 2 shows curious behaviors: the visible emission was quenched but the NIR emission was enhanced. These results can be accounted for by the enhancement of upward band bending resulting in the effective separation of electrons and holes into the bulk and the surface, respectively. Furthermore, the shallowly trapped electrons, which are responsible for visible PL, are consumed by O 2 ; hence, the visible emission is quenched. However, in the case of NIR emission, the deeply trapped electrons are responsible and they are mainly located at the surface defects. The O 2 adsorption promotes the hole accumulation at the surface and then assists the recombination of these deeply trapped electrons, resulting in the enhancement of the NIR emission. We also found that the lifetime of NIR emission (τ 1 = 43 ± 0 ns and τ 2 = 589 ± 1 ns) was much longer than that of visible emission (τ 1 = 15 ± 0 ns and τ 2 = 23 ± 0 ns), since the mobility of these deeply trapped electrons to encounter with holes is lower than that of the shallowly trapped electrons. However, even for this slow NIR emission, the actual lifetime of the deeply trapped electrons estimated by TA (1.5 ± 0.0 μs and 17 ± 0 μs) was one or two orders of magnitude longer, confirming that non-radiative recombination is dominant and it is much slower than radiative recombination: TAS and PL provide detailed information on the radiative and non-radiative recombination processes. The PL of anatase and rutile TiO 2 powders was also measured and the difference from brookite TiO 2 was discussed.

DOI： 10.1039/c7cp06975h

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85041649226&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017, Springer Science+Business Media New York. The electrochemical performances of an electrical double layer capacitor were investigated regarding the activated carbon prepared from bamboo by a new approach, that is, the combination of delignification, addition of guanidine phosphate, and CO 2 activation. In this study, a 1 M H 2 SO 4 aqueous solution was used as the electrolyte of the capacitor. The physical properties, such as the BET specific surface area of the carbon material, depend on the preparation conditions of the activated carbon. A TEM image indicated that the addition of guanidine phosphate did not facilitate the graphitization and did not prevent activation by CO 2 . The apparent reaction equation for the CO 2 activation was first-order, which is reasonable for physical activation. The electrochemical performances of the carbon material depended on the preparation conditions of the carbon material, such as the heat treatment temperature, amount of added guanidine phosphate, and CO 2 activation time. The sample prepared under the following conditions (the amount of added guanidine phosphate: 9 wt%, the heat treatment temperature: 800 °C, CO 2 activation time: 3 h) had the highest performance (153 F g −1 at 1000 mA g −1 ) because the sample had the highest BET specific surface area (2001 m 2  g −1 ).

DOI： 10.1007/s10934-017-0390-5

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85014008784&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 American Chemical Society. The interface of TiO 2 and water has been heavily researched due to the photocatalytical capabilities of this system. Whereas the majority of existing work has targeted the rutile and anatase phases of TiO 2 , much less is known about the brookite phase. In this work, we use first-principles molecular dynamics simulations to find the hydration structure of the brookite (210) surface. We find both pure water and an aqueous solution of KCl to order laterally at the sites of surface Ti cations due to electrostatic and chemical considerations, qualitatively in agreement with experimental high-resolution atomic force microscopy measurements. A significant fraction of surface oxygens is hydroxylated for all cases, with up to 40% realized for the aqueous solution at bulk coverage, a result originating in orientational constraints placed on water near the solvated K and Cl ions. Proton transfer is nearly equally frequent between the surface and liquid regions and within the liquid region, but the presence of K and Cl ions makes proton transfer less efficient.

DOI： 10.1021/acs.jpcc.7b05524

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85030455157&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V.We prepared Au-Ag nanoparticles (NPs) with two different morphologies over SrTiO3 to investigate the effect of composite nanostructure on surface plasmon-induced photocatalytic activity; core@shell (Au@Ag) NPs were synthesized by a multi-step citric reduction method, and Au-Ag bimetallic NPs were prepared by a photo-reduction method. (Au@Ag)/SrTiO3 and Au-Ag/SrTiO3 showed strong photoabsorption in the visible light response due to a localized surface plasmon resonance (LSPR) of Ag. Moreover, they could oxidize 2-propanol to acetone and CO2 under visible light irradiation (440 < λ < 800 nm). From a comparison of action spectra for acetone evolution and the Kubelka-Munk function, it was confirmed that photocatalytic activities of (Au@Ag)/SrTiO3 and Au-Ag/SrTiO3 were induced by photoabsorption based on LSPR excitation of Ag. Interestingly, the rate of acetone evolution over (Au@Ag)/SrTiO3 was 1.5-times higher than that of over Au-Ag/SrTiO3, suggesting that the core@shell (Au@Ag) nanostructure contributes to the efficient surface plasmon-induced photocatalytic activity.

DOI： 10.1016/j.apcatb.2017.04.028

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85017555019&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 The Ceramic Society of Japan. Inorganic phosphors that emit near-infrared (NIR) light are highly valued as fluorescent probes for in vivo imaging of biological tissue. NIR-imaging, however, is limited by the paucity of probes that emit over the NIR-II window (1000-1400nm). We are interested in exploring the potential of doubl e-layered perovskite structures harboring lanthanide ions as NIR-II fluorescent probes. In this report, we describe the synthesis, and characterization of the photoluminescence, afterglow and thermoluminescence of Nd 3+ -doped Sr 3 Sn 2 O 7 together with an analysis of its structural properties. Sr 3 Sn 2 O 7 :Nd 3+ has a double-layered perovskite structure with oxygen octahedral tilt and rotation, which leads to an intense NIR-II luminescence from 4f-4f transition in Nd 3+ ions; the intensity of NIR-II photoluminescence of Sr 3 Sn 2 O 7 :Nd 3+ is 10 2 times higher than that of an ordinary perovskite structure, namely SrSnO 3 :Nd 3+ . Moreover, we show the intra-layer planar defect in Sr 3 Sn 2 O 7 :Nd 3+ contributes to the long-lived NIR-II afterglow. Finally, we show time-resolved imaging of the long-lived NIR-II fluorescence of Sr 3 Sn 2 O 7 :Nd 3+ generate highcontrast images of probes embedded within a model tissue.

DOI： 10.2109/jcersj2.17051

Scopus

CiNii Article

CiNii Research

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85021719859&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 Elsevier B.V.Hydrogen bond based visible-light-response heterojunction photocatalyst Melam/WO3 (MW) has been fabricated for the first time by facile planetary milling treatment. Fourier transform infrared spectroscopy (FTIR) and Thermogravimetric (TG) analysis reveal the formation of hydrogen bonds (NH···O) between melam and WO3. As compared to WO3, the MW not only complete decomposes acetaldehyde, but also shows 10 times and 12 times higher photocatalytic activity for photo-degradation of 2-propanol and photo-generation of H2O2, respectively, under the visible-light irradiation. X-ray photoelectron spectroscopy suggests that the potential difference between N and O (N+H⋯O−) in the heterojunction provides the driving force for the charge transfer from WO3 to melam. Furthermore, hydrogen bonds offer an ultrafast electron pathway for heterojunction. This study demonstrates that hydrogen bond based heterojunction could be a promising approach for developing a new photocatalyst with efficient visible-light photocatalytic activity.

DOI： 10.1016/j.apcatb.2016.12.069

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85008697998&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.Utilization of semiconductor photocatalysts has been proved to be a cost-effective means for realizing environmental remediation. In this study, visible light-driven Bi2O2CO3/g-C3N4 nanosheets-coupled heterojunction photocatalysts were successfully fabricated via a facile planetary ball milling approach for the first time. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) revealed that an intimate contact interface formed definitely. The crystal phase, characteristic function groups, optical absorption, surface area/porosity, separation of charge carriers, and surface chemical state of the composites were symmetrically investigated by XRD, FTIR, UV-vis, BET-BJH, PL and XPS. It was found that the as-prepared photocatalysts pull double duty to promote the photocatalytic redox activity of CH3CHO, RhB and Cr (VI) degradation, showing 5.6, 4.0 and 2.5 times higher than that of g-C3N4 counterpart, respectively. Such a remarkable enhancement of photocatalytic activity was mainly attributed to the highly efficient separation of charge carriers between the nanosheets-coupled heterojunction interface, enlarged specific surface area and porosity volume, and high content of generated activated oxygen species (H2O2). The results indicate that this universal photocatalyst is a preferential option for photocatalytic degradation of various environmental contaminants.

DOI： 10.1016/j.cattod.2016.10.027

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85006067146&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 American Chemical Society.Brookite TiO2 is a promising material for active photocatalysts. However, the principal mechanism that determines the distinctive photocatalytic activity between anatase, rutile, and brookite TiO2 has not yet been fully elucidated. Therefore, in this work, we studied the behavior of photogenerated electrons and holes in these TiO2 powders by using femtosecond to millisecond time-resolved visible to mid-IR absorption spectroscopy. We found that most of the photogenerated electrons in brookite TiO2 are trapped at powder defects within a few ps. This electron trapping decreases the number of surviving free electrons, but it extends the lifetime of holes as well as the trapped electrons because the probability of electrons to encounter holes is decreased by this electron-trapping. As a result, the number of surviving holes increases, which is beneficial for photocatalytic oxidation. In contrast, the reactivity of electrons is decreased to some extent by trapping, but they still remain active for photocatalytic reductions. Electron trapping also takes place on anatase and rutile TiO2 powders, but the trap-depth in anatase is too shallow to extend the lifetime of holes and that of rutile is too deep than the thermal energy (kT) at room temperature for the electron-consuming reactions. As a result of the moderate depth of the electron trap in brookite, both electrons and holes are reactive for photocatalytic reductions and oxidations. These results have clearly demonstrated that the presence of an appropriate depth of the electron trap can effectively contribute to enhance the overall photocatalytic activity.

DOI： 10.1021/acscatal.7b00131

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85019654841&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Elsevier B.V.We report a facile and novel approach to prepare yttrium-doped CeO2 with a hollow sphere hierarchical structure by a simple hydrothermal method with cerium nitrate hexahydrate and yttrium nitrate hexahydrate as original materials and polystyrene microsphere as a soft-template. Through systematic experiments, the effects of experimental parameters such as doping and morphology on photocatalytic characteristics of the ceria were examined in detail. The morphology and element distribution of the as-prepared samples were characterized by field emission scanning electron microscopy and high-resolution transmission electron microscopy. Structure information with Rietveld refined data were obtained by using an X-ray diffractometer. Intrinsic oxygen vacancies and extrinsic oxygen vacancies caused by doping were analyzed from Raman spectra. Analyses of elements and chemical valence analysis were carried out by X-ray photoelectron spectroscopy, and changes in reactive oxygen species were determined by calculation. Based on structural information, element valence states, and the results of photocatalytic decomposition of acetaldehyde, we can draw the conclusion that Y-doped CeO2 with a hollow sphere hierarchical structure has high photocatalytic activity, attributed to more oxygen vacancies and surface active oxygen species. Yttrium doped ceria with hollow sphere structure has a maximum rate constant of 0.0267 h−1 and an oxidation quantum efficiency of 0.3610%, which are about 2 times as high as that of pure CeO2 with octahedral structure.

DOI： 10.1016/j.cattod.2016.06.049

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84997509313&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

Copyright © 2017 American Scientific Publishers All rights reserved.For the pretreatment in order to nano prepare porous carbon from biomass such as bamboo, a mixture of acetic acid and hydrogen peroxide was used for the partial delignification of bamboo. The pretreatment should be effective for the removal of lignin because the lignin percentage after the pretreatment depended on the treatment time and the treatment temperature. For the concentration of the mixture used for the pretreatment in this study, a small amount of lignin (ca. 2 wt%) remained even after a sufficiently-long treatment time. The BET specific surface area of the carbon material prepared by the heat treatment at 800 degrees C for 1 h under flowing N2 was related to the pretreatment conditions, and the specific surface areas of the samples were found to be related to the lignin percentage. The removal of lignin while maintaining the microstructure derived from plant tissue could be the reason for the local maximum of the specific surface area at ca. 5%of the lignin.

DOI： 10.1166/jnn.2017.12534

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85007543331&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 The Royal Society of Chemistry. A polycrystalline Cu 3 BiS 3 film as a photoelectrode was fabricated by an electrodeposition method on a molybdenum-coated glass substrate for photoelectrochemical hydrogen evolution. The Cu 3 BiS 3 film was composed of dense crystallites with thicknesses of ca. 0.65 μm, and the optical bandgap was estimated to be ca. 1.6 eV. Photoelectrochemical characterization revealed that the Cu 3 BiS 3 film was a p-type semiconductor with a flat band potential of ca. +0.1 V (vs. Ag/AgCl at pH 6), which is suitable for water reduction but cannot be used for water oxidation. Deposition of an In 2 S 3 buffer layer, by which effective contact between p-type Cu 3 BiS 3 and n-type In 2 S 3 was formed, resulted in a significant increase in the photocurrent and a large shift of the photocurrent onset to the positive region. H 2 evolution under AM 1.5G simulated solar light was demonstrated using the Pt-In 2 S 3 /Cu 3 BiS 3 electrode combined with a Pt electrode under an applied bias (0 V vs. RHE).

DOI： 10.1039/c7ta02740k

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85021684457&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 The Royal Society of Chemistry. Graphitic carbon nitride (g-C 3 N 4 ) was synthesized with a new precursor (thiourea oxide) by a simple one-pot calcination method. Sulphur-oxygen co-doping could modulate the band structure of pristine g-C 3 N 4 , resulting in an absorption edge of up to 600 nm, which is well consistent with DFT calculation. Thus, its photocatalytic properties were enhanced.

DOI： 10.1039/c7cy00213k

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85022188474&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2015 Elsevier B.V.We synthesized (core@shell)@shell ((Au@Ag)@Au) nanoparticles (NPs) by a multistep citrate reduction method for utilization as photosensitizers of TiO2. The (Au@Ag)@Au NPs exhibited strong photoabsorption in visible light response due to LSPR excitation of the Ag shell, and its LSPR characteristics were stable under visible light irradiation for a long time because oxidation of the Ag shell was prevented by the outermost Au shell. Furthermore, we successfully loaded (Au@Ag)@Au NPs on rutile TiO2 by an impregnation method. (Au@Ag)@Au/TiO2 could oxidize 2-propanol into acetone and CO2 under visible light irradiation (λ>440nm), and its acetone evolution rate was approximately 15-times higher than that of Au/TiO2. From a comparison of action spectra for acetone evolution and the Kubelka-Munk function, it was confirmed that photocatalytic activity of (Au@Ag)@Au/TiO2 was induced by photoabsorption based on LSPR excitation of the Ag shell. In addition, photoelectrochemical measurements revealed electron injection from LSPR-excited (Au@Ag)@Au NPs into TiO2 under visible light irradiation. We proposed the photocatalytic reaction process of (Au@Ag)@Au/TiO2 in conjunction with optical, structural and photoelectrochemical properties.

DOI： 10.1016/j.apcatb.2015.06.037

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84947742261&origin=inward

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry.Cu2ZnSnS4 (CZTS) electrodes modified with different n-type buffer layers (CdS and In2S3) were used as photocathodes for CO2 reduction under visible light irradiation (420 < λ < 800 nm) in aqueous media. Compared to a bare CZTS electrode, CZTS electrodes modified with n-type buffer layers (CdS and In2S3), by which a p-n heterojunction between CZTS and the n-type buffer layer is formed, showed a significant increase in the photocurrent assigned to CO2 reduction. In addition, product selectivity of CO2 reduction was improved by surface modification with an n-type buffer layer: that is, selective CO2 reduction into CO was achieved by using a CdS/CZTS electrode, while HCOOH selectivity was observed over an In2S3/CZTS electrode. In this study, we investigated the photoelectrochemical properties of CZTS electrodes modified with n-type buffer layers (CdS and In2S3) in conjunction with the structural and optical properties, and we investigated their activity for PEC CO2 reduction.

DOI： 10.1039/c6ra22546b

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84999098055&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

The behavior of photocarriers in anatase, rutile, and brookite TiO₂ was studied by using transient absorption and FT-IR spectroscopy. In anatase, free electrons survive > 1 ms. In contrast, most of the electrons in rutile are deeply trapped at the defects. In brookite, some of the electrons are deeply trapped, but some also survive in the conduction band. FT-IR results revealed that the rate of charge accumulation is faster in anatase but slower in rutile and brookite.

DOI： 10.14886/sssj2008.36.0_217

CiNii Article

CiNii Research

その他リンク： http://ci.nii.ac.jp/naid/130005175571

記述言語：英語   掲載種別：研究論文（学術雑誌）

The thermoelectric properties, such as the Seebeck coefficient value, S, electrical conductivity, σ, and thermal conductivity, κ, of Sb- and Cu-doped SnO2, that is, (Sn1-x-y Cu x Sb y )O2, were investigated in detail. The addition of a small amount of CuO significantly improved the relative density of the SnO 2 ceramics. However, the relative density slightly decreased with the excessive addition of CuO (more than x = 0.03). The addition of Sb 2O5 should cause an increase in the number of charge carriers, resulting in an increased σ value, and the addition of both CuO and Sb2O5 caused an increase in σ and |S| at high temperature. The improvement of the sintering performance caused the enhancement of the thermoelectric performance. As the temperature region measured in this study (293-1073 K), the maximum ZT value was 0.29 at 1073 K for (Sn 0.985Cu0.005Sb0.01)O2. © 2014 TMS.

DOI： 10.1007/s11664-014-3227-x

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84906306966&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

A rhodium(III) ion (Rh3+)-modified TiO2 (Rh 3+/TiO2) photocatalyst, prepared by a simple adsorption method and exhibiting high levels of photocatalytic activity in degradation of organic compounds, was investigated by using X-ray absorption fine structure (XAFS) measurements, (photo)electrochemical measurements, double-beam photoacoustic (DB-PA) spectroscopic measurements, and photoluminescence measurements. Based on the results, the features of the Rh3+ modifier and the working mechanism of the Rh3+/TiO2 photocatalyst are discussed. XAFS measurements revealed that the Rh3+ species were highly dispersed and almost atomically isolated on TiO2. The (photo)electrochemical measurements, DB-PA spectroscopic measurements, and photoluminescence showed a unique bifunction of the Rh3+ modifier as a promoter for O2 reductions and an electron injector to the conduction band of TiO2 for response to visible light. The reasons for the Rh3+/TiO2 photocatalyst exhibiting higher levels of photocatalytic activity than those of TiO2 photocatalysts modified with other metal ions are also discussed on the basis of obtained results. © 2013 American Chemical Society.

DOI： 10.1021/jp311801e

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84878347742&origin=inward

記述言語：日本語   掲載種別：記事・総説・解説・論説等（学術雑誌）

DOI： 10.5796/electrochemistry.81.103

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10031139466

記述言語：日本語   掲載種別：記事・総説・解説・論説等（学術雑誌）

Diamond film and ultrananocrystalline diamond (UNCD) film were synthesized on BeCu alloy substrate by using hot filament CVD apparatus. We succeed in the synthesis of diamond film and Boron-doped electrically conductive diamond film on the substrate. Moreover, UNCD film was successfully synthesized by the CVD apparatus, although this film was not electrically conductive electrically conductive. At the first stage of the CVD process for UNCD, needle-shape deposits appeared. A two-step process, that is, the synthesis of UNCD and then boron-doped diamond, was effective for the synthesis of the electrically conductive diamond film having smooth surface.

DOI： 10.2109/jcersj2.121.187

Kyutacar

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130004950807

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Fluorescent poly(St-co-Eu(MAA)3Phen) microspheres have been facilely fabricated via copolymerization of styrene and Eu(MAA)3Phen with using the mixture of water and methanol as the dispersing medium in presence of sodium p-styrenesulfonate (NaSS). Strong photoluminescent europium coordination compound was inherited in the resulting polystyrene composite The microstructures and morphologies of the obtained poly(St-co-Eu(MAA) 3Phen) were characterized by using FT-IR, SEM-EDS, ICP-MS and TEM. Their fluorescence properties were measured by the fluorescence spectrometer. © the authors.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84871288912&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.4032/9789814364515

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84880190266&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.diamond.2012.01.012

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1166/jnn.2012.6142

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.jpowsour.2011.07.025

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.diamond.2011.03.009

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.jpowsour.2011.02.043

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.apcatb.2011.01.015

Kyutacar

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.catcom.2010.10.012

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Shape-controlled rutile titanium(IV) oxide (TiO2) nanorods with various aspect ratios were prepared by two-step synthesis in the presence of two kinds of inorganic anions. The first synthesis step from titanium(III) chloride solution induced the formation of aggregated needlelike rutile TiO2, the shape of which largely depended on the inorganic anion used. Moreover, shape-controlled rutile TiO2 rods with {110} side crystal faces and {111} and/or {001} edge crystal faces were obtained by hydrothermal treatment of the needlelike rutile TiO2. Their aspect ratios were largely influenced by the starting material used in the hydrothermal treatment. The photocatalytic activity for decomposition of acetaldehyde increased with decreasing aspect ratio because the surface area ratio of {111} and/or {001} to {110} exposed crystal faces, which are attributed to oxidation and reduction sites respectively, became more optimal. © 2010 American Chemical Society.

DOI： 10.1021/jp109057s

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78651459703&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

{1 1 1} exposed crystal faces of shape-controlled rutile titanium(IV) oxide (TiO2) were site-selectively modified with trivalent iron(III) (Fe3+) ions by utilizing adsorption property of iron(III)/iron(II) (Fe3+/Fe2+) ions. The rutile TiO2 with site-selective modification of Fe3+ ions showed high photocatalytic activity under visible-light irradiation as a result of separation of redox sites, i.e., oxidation and reduction proceed over Fe3+ ions on {1 1 1} faces and the bare TiO2 surface on {1 1 0} faces, respectively. Double-beam photoacoustic spectroscopic analyses suggest that the high activity of TiO2 with site-selective modification of Fe3+ ions is attributed to not efficient electron injection from Fe3+ ions but efficient reduction by injected electrons on {1 1 0} faces. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apcatb.2010.03.030

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77953136825&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Rutile TiO2 nanorods synthesized by hydrothermal treatment were etched by addition of H2O2-NH3 or H 2SO4 solution. The etched rutile TiO2 nanorods were characterized by TEM, SEM, XRD, and specific surface area measurements. New crystal faces were generated on rutile TiO2 nanorods by means of chemical etching. In the case of treatment with H2O 2-NH3 solution, the shape of the rutile TiO2 nanorod changed to a sepal-like structure with reaction time. The dissolution of rutile TiO2 nanorod mainly proceeded along [001] direction. When treated with sulfuric acid, the end [(111) face] of the rutile TiO2 nanorod was gradually etched. The rutile TiO2 nanorod finally exposed (001) and (021) faces during prolonged treatment time. In both cases, rutile TiO2 nanorods were differently etched. The etched rutile TiO 2 nanorod showed higher photocatalytic activity for degradation of toluene in gas phase than the original particles. © 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.apcata.2010.03.029

Kyutacar

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77954184696&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Crystal transformation of a titanate nanotube (TNT) into titanium(IV) oxide (TiO2) particles proceeded under various hydrothermal conditions with an inorganic acid. The contents of the crystal structure of TiO 2, i.e., anatase, rutile and brookite, and the particle shape were greatly influenced by the type and concentration of inorganic acid, hydrothermal duration and temperature. TiO2 particles with larger contents of brookite structure (more than 0.9 of the relative fraction of the crystal structures) were obtained by 50 h of hydrothermal treatment with 2 mol dm -3 of perchloric acid at a hydrothermal temperature of 200 °C. © The Royal Society of Chemistry.

DOI： 10.1039/b913586n

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77950270640&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.2174/138527210790963386

Kyutacar

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.diamond.2010.03.006

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：日本語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2007年04月  -  2007年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2007年04月  -  2007年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2003年04月  -  2003年04月

Kyutacar

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2003年04月  -  2003年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2003年04月  -  2003年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：日本語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Kyutacar

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

開催期間： 2023年07月01日   記述言語：日本語   開催地：北九州国際会議場   国名：日本国  

開催期間： 2023年07月01日   記述言語：日本語   開催地：北九州国際会議場   国名：日本国  

開催期間： 2023年07月01日   記述言語：日本語   開催地：北九州国際会議場   国名：日本国  

開催期間： 2023年07月01日   記述言語：英語   開催地：北九州国際会議場   国名：日本国  

開催期間： 2023年07月01日   記述言語：英語   開催地：北九州国際会議場   国名：日本国  

開催期間： 2023年03月27日 - 2023年03月29日   記述言語：日本語   開催地：東北工業大学八木山キャンパス   国名：日本国  

開催期間： 2023年03月27日 - 2023年03月29日   記述言語：日本語   開催地：東北工業大学八木山キャンパス   国名：日本国  

開催期間： 2023年03月27日 - 2023年03月29日   記述言語：日本語   開催地：東北工業大学八木山キャンパス   国名：日本国  

開催期間： 2023年03月16日 - 2023年03月17日   記述言語：英語   開催地：神奈川大学　みなとみらいキャンパス   国名：日本国  

開催期間： 2023年03月16日 - 2023年03月17日   記述言語：日本語   開催地：神奈川大学　みなとみらいキャンパス   国名：日本国  

開催期間： 2023年03月16日 - 2023年03月17日   記述言語：日本語   開催地：神奈川大学　みなとみらいキャンパス   国名：日本国  

開催期間： 2023年03月16日 - 2023年03月17日   記述言語：日本語   開催地：神奈川大学　みなとみらいキャンパス   国名：日本国  

開催期間： 2022年12月12日 - 2022年12月14日   記述言語：英語   開催地：On Line   国名：日本国  

開催期間： 2022年12月12日 - 2022年12月14日   記述言語：英語   開催地：On Line   国名：日本国  

開催期間： 2022年09月12日 - 2022年09月14日   記述言語：英語   国名：中華人民共和国  

開催期間： 2022年06月06日 - 2022年06月09日   記述言語：英語   国名：イタリア共和国  

開催期間： 2022年03月28日 - 2022年03月30日   記述言語：日本語   開催地：On Line   国名：日本国  

開催期間： 2022年03月28日 - 2022年03月30日   記述言語：日本語   開催地：On Line   国名：日本国  

開催期間： 2022年03月28日 - 2022年03月30日   記述言語：日本語   開催地：On Line   国名：日本国  

開催期間： 2021年12月16日 - 2021年12月21日   記述言語：英語   開催地：On Line   国名：アメリカ合衆国  

開催期間： 2021年12月16日 - 2021年12月21日   記述言語：英語   開催地：On Line   国名：アメリカ合衆国  

開催期間： 2021年12月16日 - 2021年12月21日   記述言語：英語   開催地：On Line   国名：アメリカ合衆国  

開催期間： 2021年12月16日 - 2021年12月21日   記述言語：英語   開催地：On Line   国名：アメリカ合衆国  

開催期間： 2021年07月16日   記述言語：英語   国名：日本国  

開催期間： 2021年07月16日   記述言語：英語   国名：日本国  

開催期間： 2021年07月16日   記述言語：英語   国名：日本国  

開催期間： 2021年07月03日   記述言語：英語   国名：日本国  

開催期間： 2021年07月03日   記述言語：日本語   国名：日本国  

開催期間： 2021年07月03日   記述言語：日本語   国名：日本国  

開催期間： 2021年07月03日   記述言語：日本語   国名：日本国  

開催期間： 2021年07月03日   記述言語：英語   国名：日本国  

開催期間： 2021年07月03日   記述言語：英語   国名：日本国  

開催期間： 2020年11月27日   記述言語：英語   国名：日本国  

開催期間： 2020年11月27日   記述言語：英語   国名：日本国  

開催期間： 2020年11月27日   記述言語：英語   国名：日本国  

開催期間： 2020年09月16日 - 2020年09月18日   記述言語：日本語   開催地：静岡大学　浜松キャンパス   国名：日本国  

開催期間： 2020年09月16日 - 2020年09月18日   記述言語：英語   開催地：静岡大学　浜松キャンパス   国名：日本国  

開催期間： 2019年09月11日 - 2019年09月14日   記述言語：英語  

開催期間： 2019年09月10日 - 2019年09月12日   記述言語：日本語  

開催期間： 2019年09月10日 - 2019年09月12日   記述言語：日本語  

開催期間： 2019年07月13日   記述言語：日本語  

開催期間： 2019年07月13日   記述言語：日本語  

開催期間： 2019年07月13日   記述言語：日本語  

開催期間： 2019年06月21日   記述言語：英語  

開催期間： 2019年06月21日   記述言語：英語  

開催期間： 2019年03月27日 - 2019年03月29日   記述言語：日本語  

開催期間： 2019年03月20日 - 2019年03月21日   記述言語：英語  

開催期間： 2019年03月20日 - 2019年03月21日   記述言語：英語  

開催期間： 2018年09月23日 - 2018年09月25日   記述言語：日本語  

開催期間： 2018年09月23日 - 2018年09月25日   記述言語：日本語  

開催期間： 2018年09月23日 - 2018年09月25日   記述言語：日本語  

開催期間： 2018年09月23日 - 2018年09月25日   記述言語：日本語  

開催期間： 2018年07月07日   記述言語：日本語  

開催期間： 2018年07月07日   記述言語：日本語  

開催期間： 2018年07月07日   記述言語：日本語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2012年10月07日 - 2012年10月12日   記述言語：英語  

開催期間： 2011年12月12日   記述言語：英語  

開催期間： 2011年12月04日 - 2011年12月07日   記述言語：英語  

開催期間： 2011年10月07日 - 2011年10月10日   記述言語：英語  

開催期間： 2011年10月07日 - 2011年10月10日   記述言語：英語  

開催期間： 2011年10月07日 - 2011年10月10日   記述言語：英語  

開催期間： 2011年09月29日 - 2011年09月30日   記述言語：英語  

開催期間： 2011年09月20日 - 2011年09月22日   記述言語：日本語  

開催期間： 2011年09月20日 - 2011年09月22日   記述言語：日本語  

開催期間： 2011年09月09日 - 2011年09月11日   記述言語：日本語  

開催期間： 2011年09月09日 - 2011年09月11日   記述言語：日本語  

開催期間： 2011年09月06日 - 2011年09月08日   記述言語：日本語  

開催期間： 2011年09月06日 - 2011年09月08日   記述言語：日本語  

開催期間： 2011年07月21日   記述言語：日本語  

開催期間： 2011年06月10日   記述言語：日本語  

開催期間： 2011年03月29日 - 2011年03月31日   記述言語：日本語   開催地：日本 横浜市  

開催期間： 2011年03月29日 - 2011年03月31日   記述言語：日本語   開催地：日本 横浜市  

開催期間： 2011年03月29日 - 2011年03月31日   記述言語：日本語   開催地：日本 横浜市  

開催期間： 2011年03月29日 - 2011年03月30日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2011年03月26日 - 2011年03月29日   記述言語：日本語   開催地：日本 横浜市  

開催期間： 2011年03月26日 - 2011年03月29日   記述言語：日本語   開催地：日本 横浜市  

開催期間： 2011年03月01日   記述言語：日本語   開催地：日本 京都府  

開催期間： 2010年12月15日 - 2010年12月20日   記述言語：英語   開催地： America  

開催期間： 2010年12月15日 - 2010年12月20日   記述言語：英語   開催地： America  

開催期間： 2010年12月15日 - 2010年12月20日   記述言語：英語   開催地： America  

開催期間： 2010年12月15日 - 2010年12月20日   記述言語：英語   開催地： America  

開催期間： 2010年12月15日 - 2010年12月20日   記述言語：英語   開催地： America  

開催期間： 2010年12月02日   記述言語：日本語   開催地：日本 川崎市  

開催期間： 2010年11月15日 - 2010年11月18日   記述言語：英語   開催地： America  

開催期間： 2010年11月15日 - 2010年11月18日   記述言語：英語   開催地： America  

開催期間： 2010年09月15日 - 2010年09月18日   記述言語：日本語   開催地：日本 甲府市  

開催期間： 2010年09月02日 - 2010年09月03日   記述言語：日本語   開催地：日本 厚木市  

開催期間： 2010年09月02日 - 2010年09月03日   記述言語：日本語   開催地：日本 厚木市  

開催期間： 2010年09月02日 - 2010年09月03日   記述言語：日本語   開催地：日本 厚木市  

開催期間： 2010年07月25日 - 2010年07月30日   記述言語：英語   開催地： Korea  

開催期間： 2010年07月25日 - 2010年07月30日   記述言語：英語   開催地： Korea  

開催期間： 2010年07月25日 - 2010年07月30日   記述言語：英語   開催地： Korea  

開催期間： 2010年06月13日 - 2010年06月16日   記述言語：英語   開催地： CZECH REPUBLIC Prague, CZECH REPUBLIC チェコ共和国  

開催期間： 2010年04月12日 - 2010年04月14日   記述言語：英語   開催地： Scotland  

開催期間： 2010年04月12日 - 2010年04月14日   記述言語：英語   開催地： Scotland  

開催期間： 2010年03月24日 - 2010年03月25日   記述言語：日本語   開催地：日本 京都府  

開催期間： 2010年03月24日 - 2010年03月25日   記述言語：日本語   開催地：日本 京都府  

開催期間： 2010年03月24日 - 2010年03月25日   記述言語：日本語   開催地：日本 京都府  

開催期間： 2009年12月15日   記述言語：日本語   開催地：日本 福岡市  

開催期間： 2009年12月02日   記述言語：日本語   開催地：日本 福岡市  

開催期間： 2009年10月16日   記述言語：日本語   開催地：日本 福岡市  

開催期間： 2009年09月27日 - 2009年09月30日   記述言語：日本語   開催地：日本 宮崎市  

開催期間： 2009年09月27日 - 2009年09月30日   記述言語：日本語   開催地：日本 宮崎市  

開催期間： 2009年09月27日 - 2009年09月30日   記述言語：日本語   開催地：日本 宮崎市  

開催期間： 2009年09月14日 - 2009年09月15日   記述言語：英語   開催地： Turkey  

開催期間： 2009年09月14日 - 2009年09月15日   記述言語：英語   開催地： Turkey  

開催期間： 2009年09月10日 - 2009年09月11日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2009年09月10日 - 2009年09月11日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2009年07月15日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2009年06月15日   記述言語：英語   開催地：日本 Germany  

開催期間： 2009年03月30日 - 2009年04月02日   記述言語：英語   開催地： Germany  

開催期間： 2009年03月30日 - 2009年04月02日   記述言語：英語   開催地： Germany  

開催期間： 2009年01月19日 - 2009年01月20日   記述言語：英語   開催地： Korea  

開催期間： 2008年10月12日 - 2008年10月17日   記述言語：英語   開催地： America  

開催期間： 2008年10月12日 - 2008年10月17日   記述言語：英語   開催地： America  

開催期間： 2008年10月12日 - 2008年10月17日   記述言語：英語   開催地： America  

開催期間： 2008年10月04日 - 2008年10月08日   記述言語：英語   開催地： Italy  

開催期間： 2008年10月04日 - 2008年10月08日   記述言語：英語   開催地： Italy  

開催期間： 2008年10月04日 - 2008年10月08日   記述言語：英語   開催地： Italy  

開催期間： 2008年09月23日 - 2008年09月26日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2008年07月27日 - 2008年08月01日   記述言語：英語   開催地： Australia  

開催期間： 2008年07月27日 - 2008年08月01日   記述言語：英語   開催地： Australia  

開催期間： 2008年07月27日 - 2008年08月01日   記述言語：英語   開催地： Australia  

開催期間： 2008年07月16日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2008年05月23日 - 2008年05月24日   記述言語：英語   開催地：日本  

開催期間： 2008年05月23日 - 2008年05月24日   記述言語：英語   開催地：日本  

開催期間： 2008年05月23日 - 2008年05月24日   記述言語：英語   開催地：日本  

開催期間： 2008年05月23日 - 2008年05月24日   記述言語：英語   開催地：日本  

開催期間： 2008年05月23日 - 2008年05月24日   記述言語：英語   開催地：日本  

開催期間： 2008年03月29日 - 2008年03月31日   記述言語：日本語   開催地：日本 甲府市  

開催期間： 2008年03月29日 - 2008年03月31日   記述言語：日本語   開催地：日本 甲府市  

開催期間： 2008年03月29日 - 2008年03月31日   記述言語：日本語   開催地：日本 甲府市  

開催期間： 2008年03月28日 - 2008年03月29日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2008年03月28日 - 2008年03月29日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2008年03月26日 - 2008年03月30日   記述言語：日本語   開催地：日本 東京都  

開催期間： 2007年12月04日   記述言語：日本語   開催地：日本 神奈川  

開催期間： 2007年11月26日 - 2007年11月27日   記述言語：日本語   開催地：日本 大阪府  

開催期間： 2007年11月22日 - 2007年11月26日   記述言語：英語   開催地： Korea  

開催期間： 2007年10月25日 - 2007年10月26日   記述言語：日本語   開催地：日本 北九州市  

開催期間： 2007年09月24日 - 2007年09月27日   記述言語：英語   開催地： Amerika  

開催期間： 2007年09月24日 - 2007年09月27日   記述言語：英語   開催地： America Niagara Falls, New York, USA  

開催期間： 2007年09月19日 - 2007年09月20日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年09月19日 - 2007年09月20日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年09月19日 - 2007年09月20日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年09月17日 - 2007年09月21日   記述言語：日本語   開催地：日本 北海道  

開催期間： 2007年09月17日 - 2007年09月21日   記述言語：日本語   開催地：日本 北海道  

開催期間： 2007年07月10日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年06月08日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年05月31日   記述言語：英語   開催地：日本 北九州市  

開催期間： 2007年03月29日 - 2007年03月31日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年03月29日 - 2007年03月31日   記述言語：日本語   開催地：日本 東京  

開催期間： 2007年03月28日 - 2007年03月29日   記述言語：日本語   開催地：日本 神戸  

開催期間： 2007年03月25日 - 2007年03月28日   記述言語：日本語   開催地：日本 大阪  

開催期間： 2006年12月13日   記述言語：日本語   開催地：日本 東京  

開催期間： 2006年09月20日 - 2006年09月22日   記述言語：日本語   開催地：日本 北九州市  

開催期間： 2006年09月14日 - 2006年09月15日   記述言語：日本語   開催地：日本 京都  

開催期間： 2006年06月09日   記述言語：日本語  

開催期間： 2006年04月   記述言語：英語   開催地：日本 京都  

開催期間： 2006年04月   記述言語：英語   開催地： Germany Goslar  

開催期間： 2006年04月   記述言語：英語   開催地：日本 京都  

開催期間： 2006年04月   記述言語：英語   開催地：日本 京都  

開催期間： 2006年04月   記述言語：英語   開催地： Sweden Uppsala  

開催期間： 2006年04月   記述言語：英語   開催地：日本 Japan 東京  

開催期間： 2006年04月   記述言語：日本語   開催地：日本 東京