研究者詳細 - 安藤　義人

論文 - 安藤　義人

分割表示185 件中 41 - 60 件目／全件表示 >>

Magnetic Domain Observation of Milled Nanocrystalline Alloy Powder 査読有り国際誌

Takezawa M., Nagaki T., Motozuka S., Sasaki I., Ando Y., Narahara H., Mori N., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T.

IEEE Transactions on Magnetics ( Institute of Electrical and Electronics Engineers (IEEE) ) 59 ( 11 ) 1 - 5 2023年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Fe-based nanocrystalline alloys have high magnetic flux density and low loss. Therefore, in this study, the magnetic domain structure of the ball-milled magnetic powders of these nanocrystalline alloys was observed using a Kerr effect microscope. The effect of strain removal heat treatment on the magnetic properties of the powder was also investigated by observing and comparing the magnetic domain structure of the milled powder before and after heat treatment during the preparation process of the nanocrystalline-milled powder. Our findings showed that the strain removal heat treatment changed the size and shape of the magnetic domains to a simple structure. In addition, the domain wall motion was found to be sensitive to the magnetic field, resulting in soft magnetic properties.

DOI： 10.1109/TMAG.2023.3283211

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Use of the Wise method as a pretreatment for the selective removal of lignin when preparing bamboo-activated carbon 査読有り国際誌

Tsubota T., Khuong D.A., Nagaoka H., Kumagai S., Andou Y.

Advances in Bamboo Science 5 2023年11月

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 Wise method, which is known in wood science as a technique for the quantitative analysis of holocellulose, was applied as a pre-treatment to prepare a porous precursor for activated carbon. The precursor has a specific pore size structure derived from the organizational architecture of the natural plant. The lignin in the plant tissue of the bamboo was successfully removed in a stepwise fashion by the Wise method treatment. All the N2 adsorption isotherms at 77 K for the carbonized samples, including the samples treated by the Wise method, were similar in shape. Specifically, they were type I as classified by IUPAC with low-pressure hysteresis, and there was no specific effect of the selective removal of lignin from the carbonized sample. However, after CO2 activation for more than 2 h, samples treated with the Wise method had slit pores, which is type H4 as classified by IUPAC. The slit width calculated by the INNES method, which is the theory for slit-type mesopores, was ca. 2.5 nm. When samples delignified by more than 60% were activated by CO2 for 3 h, the percentage of the micropores in the total pores was ca. 40%. Samples treated by the Wise method for the stepwise selective removal of lignin, should enable pore structure derived from plant tissue to be controlled in the activated carbon.

DOI： 10.1016/j.bamboo.2023.100049

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Deposition of Transparent Ag Nanowires‐Based Top Electrode for the Development of Double‐Side Green Light Hybrid Photodetector 査読有り国際誌

安藤義人, パンディシャムスディル

Physica Status Solidi. A, Applications and Materials Science ( Wiley ) 220 ( 24 ) 2300166 2023年10月

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）

Herein, various silver nanowires (AgNWs) deposition techniques, i.e., spin coating, Mayer rod coating, and spray coating are used to fabricate ZnO/P3HT-based double-side hybrid photodetectors and their photoresponse for 520 nm green light has been compared. The electrodes are coated over the polyethylene terephthalate sheet separately and laminated over the indium tin oxide (ITO)/ZnO/P3HT. Mayer rod-coated electrodes are found to have a sheet resistance (Rsh) of 24 Ω Sq.−1 and a light transmission of 91%. Additionally, spin- and spray-coated AgNW electrodes exhibit Rsh of 20 and 23 Ω Sq.−1, respectively, along with 80% and 85% transparencies. As the device consists of transparent electrodes on both sides, it can detect light from both the top and bottom sides. Mayer rod-coated AgNW electrode-based device has produced better photosensitivity of 1500 (for ITO side illumination) and 630 (for AgNWs side illumination) at λ = 525 nm. Further, the device has demonstrated the responsivity of 124 mAW−1 and specific detectivity of 3 × 1011 Jones.

その他リンク： https://kyutech.repo.nii.ac.jp/records/2000776

Fabrication of Graphene-Based Nanofiltration Membrane from Fractionated Bamboo Lignin for Dye Removal and Desalination 査読有り国際誌

Mohammed Abdillah Ahmad Farid, Sarah Sabidi, Wang Ruozhu, Jacqueline Lease, Toshinari Maeda, Toshiki Tsubota, Yoshito Andou

ACS Applied Engineering Materials ( American Chemical Society (ACS) ) 1 2791 - 2808 2023年10月

Production of biochar and activated carbon from oil palm biomass: Current status, prospects, and challenges 査読有り国際誌

Zakaria M.R., Ahmad Farid M.A., Andou Y., Ramli I., Hassan M.A.

Industrial Crops and Products 199 2023年09月

記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

The palm oil industry produces large quantities of biomass residues that can be utilized to produce value-added products. Oil palm biomass has an average carbon content ranging from 42.7% to 57.9%, with 3.5–27% fixed carbon, making it a promising source of carbonaceous, thermogenic materials. With estimated yearly production hovering around giga-tonnes, rising interest in bio-based carbonaceous products paves the way for new commercial and scientific applications and holds the potential to be worth millions of dollars on the market as society begins to take the climate crisis gravely. Pyrolysis is the most used technique for converting lignocellulosic feedstock into carbon and energy-rich by-products, with the resulting properties being highly dependent on the feedstock and reaction conditions. This process, which occurs at high temperatures in an oxygen-free or low-oxygen environment, improves carbon content, energy density, surface functionality, and porosity. However, given the lack of a precise technical definition for carbon materials and methods available, studies of biochar and activated carbon (AC) are progressively colliding with one another. Therefore, based on their respective backgrounds and methods of synthesis, their differences are outlined in this report. The present review highlights recent progress and development of biochar and AC from oil palm biomass by looking at the technical aspects of product generation and potential applications. Considering the potential use of these biomass materials for in-house and future applications, strategies, challenges and action should be taken by all parties including government, academia, industry, and consumer to foster the sustainability and circular bioeconomy in the oil palm industry.

DOI： 10.1016/j.indcrop.2023.116767

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High field-effect mobility in oriented thin films of D-A type semiconducting polymers by engineering stable interfacial system 査読有り国際誌

Sharma S., Vats A.K., Tang L., Kaishan F., Toyoda J., Nagamatsu S., Ando Y., Tamagawa M., Tanaka H., Pandey M., Pandey S.S.

Chemical Engineering Journal 469 2023年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

Conjugated polymers (CPs) have emerged as excellent organic semiconducting materials for flexible electronic applications. CPs exhibit a notably fast carrier transport along their main π-conjugated backbone followed by inter-chain hopping compelling the need to form large and ordered domains in thin films. Therefore, the formation of larger domains, along with their orientation, is critical in controlling the electrical properties of CP-based organic electronic devices. However, controlling the molecular ordering along with the formation of large aggregates is a challenge. In this work, the unidirectional floating film transfer method (UFTM) has been utilized to prepare oriented thin films of CPs, which is a highly facile, cost-effective and material utilization efficient technique. We have demonstrated that extent and direction of molecular orientation in the fabricated thin films can be tuned along with the higher degree of aggregation. The rheological aspects, especially viscosity, play a significant role in determining molecular ordering along with the formation of these large aggregates. Active control of viscosity to achieve a stable interfacial viscous system is paramount to achieving this, resulting in a very high mobility of 12.4 cm2V−1s−1.

DOI： 10.1016/j.cej.2023.143932

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Catalytic graphitization of biomass-derived ethanosolv lignin using Fe, Co, Ni, and Zn: Microstructural and chemical characterization 査読有り国際誌

Farid M.A.A., Zheng A.L.T., Tsubota T., Andou Y.

Journal of Analytical and Applied Pyrolysis 173 2023年08月

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）

Bamboo has just recently emerged as a sustainable source of lignin extraction, paving the way for the development of sophisticated nano- and biomaterials based on lignin. Catalytic pyrolysis effectively synthesized graphitic carbon from biomass resources. This article investigates the influence of various metals (Fe, Co, Ni, and Zn) as catalysts in the catalytic graphitization of bamboo biomass-derived lignin. The graphitization process was carried out through thermal treatments conducted in a tightly closed muffle furnace at 1100 ℃ for a duration of 4 hrs. The metals-catalyzed graphitic carbons appeared flake-like microstructures under SEM with > 80 wt% graphitized carbon composition detected by XPS. Enhancement in the degree of graphitization, crystallite size, interlayer distance, and structural order was achieved within the order of Fe>Co>Ni>Zn. These are corroborated by XRD, indicating Fe-catalyst resulted in lignin graphite with a degree of graphitization of 92.07%, crystallite size (Lc) of 230.2 nm, and interlayer distances of 0.336 nm that are closer to commercial graphite. Raman revealed the Fe-catalysed lignin graphite has a lower defective ratio (ID/IG) of 0.55, while all graphitized lignin showed IG/I2D of > 1.0, indicating multiple layers of graphitic carbon. These findings might pave the way for future high-value graphite-based materials made from low-cost biomass, making it an intriguing prospect.

DOI： 10.1016/j.jaap.2023.106064

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Enhancing the Performance of Organic Phototransistors Based on Oriented Floating Films of P3HT Assisted by Al-Island Deposition 査読有り国際誌

Lahane T.K., Sharma S., Desu M., Ando Y., Pandey S.S., Singh V.

Materials 16 ( 15 ) 2023年08月

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 fabrication of high-performance Organic Phototransistors (OPTs) by depositing Al-islands atop Poly(3-hexylthiophene) (P3HT) thin film coated using the unidirectional floating-film transfer method (UFTM) has been realized. Further, the effect of Al-island thickness on the OPTs’ performance has been intensively investigated using X-ray photoelectron spectroscopy, X-ray Diffraction, Atomic force microscopy and UV-Vis spectroscopy analysis. Under the optimized conditions, OPTs’ mobility and on–off ratio were found to be 2 × 10−2 cm2 V−1 s−1 and 3 × 104, respectively. Further, the device exhibited high photosensitivity of 105, responsivity of 339 A/W, detectivity of 3 × 1014 Jones, and external quantum efficiency of 7.8 × 103% when illuminated with a 525 nm LED laser (0.3 mW/cm2).

DOI： 10.3390/ma16155249

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High field-effect mobility in oriented thin films of D-A type semiconducting polymers by engineering stable interfacial system 査読有り国際誌

永松秀一, 安藤義人, 玉川雅章, 田中啓文, パンディシャムスディル

Chemical Engineering Journal ( Elsevier ) 469 143932 2023年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

Conjugated polymers (CPs) have emerged as excellent organic semiconducting materials for flexible electronic applications. CPs exhibit a notably fast carrier transport along their main π-conjugated backbone followed by inter-chain hopping compelling the need to form large and ordered domains in thin films. Therefore, the formation of larger domains, along with their orientation, is critical in controlling the electrical properties of CP-based organic electronic devices. However, controlling the molecular ordering along with the formation of large aggregates is a challenge. In this work, the unidirectional floating film transfer method (UFTM) has been utilized to prepare oriented thin films of CPs, which is a highly facile, cost-effective and material utilization efficient technique. We have demonstrated that extent and direction of molecular orientation in the fabricated thin films can be tuned along with the higher degree of aggregation. The rheological aspects, especially viscosity, play a significant role in determining molecular ordering along with the formation of these large aggregates. Active control of viscosity to achieve a stable interfacial viscous system is paramount to achieving this, resulting in a very high mobility of 12.4 cm2V−1s−1.

その他リンク： https://kyutech.repo.nii.ac.jp/records/2000734

Optimization of Cellulose Nanofiber Loading and Processing Conditions during Melt Extrusion of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) Bionanocomposites 査読有り国際誌

Shazleen S.S., Sabaruddin F.A., Ando Y., Ariffin H.

Polymers 15 ( 3 ) 2023年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

This present study optimized the cellulose nanofiber (CNF) loading and melt processing conditions of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) P(HB-co-11% HHx) bionanocomposite fabrication in twin screw extruder by using the response surface methodology (RSM). A face-centered central composite design (CCD) was applied to statistically specify the important parameters, namely CNF loading (1–9 wt.%), rotational speed (20–60 rpm), and temperature (135–175 °C), on the mechanical properties of the P(HB-co-11% HHx) bionanocomposites. The developed model reveals that CNF loading and temperature were the dominating parameters that enhanced the mechanical properties of the P(HB-co-11% HHx)/CNF bionanocomposites. The optimal CNF loading, rotational speed, and temperature for P(HB-co-11% HHx) bionanocomposite fabrication were 1.5 wt.%, 20 rpm, and 160 °C, respectively. The predicted tensile strength, flexural strength, and flexural modulus for these optimum conditions were 22.96 MPa, 33.91 MPa, and 1.02 GPa, respectively, with maximum desirability of 0.929. P(HB-co-11% HHx)/CNF bionanocomposites exhibited improved tensile strength, flexural strength, and modulus by 17, 6, and 20%, respectively, as compared to the neat P(HB-co-11% HHx). While the crystallinity of P(HB-co-11% HHx)/CNF bionanocomposites increased by 17% under the optimal fabrication conditions, the thermal stability of the P(HB-co-11% HHx)/CNF bionanocomposites was not significantly different from neat P(HB-co-11% HHx).

DOI： 10.3390/polym15030671

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Removal of leachate pollutants using flocculation method at simultaneous factors of optimum pH and Tacca leontopetaloides biopolymer flocculant (TBPF) dosage via face-centred central composite design 査読有り国際誌

Mohd Makhtar N.S., Idris J., Musa M., Andou Y., Ku Hamid K.H., Puasa S.W., Husen R.

Water and Environment Journal 37 ( 3 ) 412 - 427 2023年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

The effect of the interaction factor between pH and dosage is important in leachate wastewater treatment. This study aims to remove leachate pollutants such as turbidity, total suspended solid (TSS), chemical oxygen demand (COD) and colour using simultaneous factors of plant-based Tacca leontopetaloides biopolymer flocculant (TBPF) dosage and leachate pH. The flocculation process was carried out through jar test by applying the perikinetic theory and statical analysis (face-centred central composite design). The results found that the optimum leachate pH and TBPF dosage were pH 3 and 150 mg/L, respectively. The highest removal of leachate pollutants reached up to 69% with a second-order perikinetic model; R2 = 0.9545 and k = 9 × 10−6 L/mg/min were obtained. Simultaneous interaction factors between leachate pH and TBPF dosage on turbidity and TSS removal were found significant and hence can be applied in the actual leachate wastewater treatment industry, particularly at the primary stage using the proposed model.

DOI： 10.1111/wej.12846

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Porous Graphene-Based Materials for Enhanced Adsorption Towards Emerging Micropollutants (EMs) 査読有り

Farrag H.N. a, b; Zheng A.L.T. c; Sabidi S. b; Wu Y. b; Ikeno S. b; Maeda T. b, d; Andou Y. b, d; Kato T. b

Materials Horizons: From Nature to Nanomaterials ( Institute for Ionics ) 547 - 570 2023年01月

Novel cyclic undecapeptides immobilized on reduced graphene oxide surface for enhanced antibacterial properties 査読有り国際誌

Farrag H.N., Zheng A.L.T., Sabidi S., Wu Y., Ikeno S., Maeda T., Andou Y., Kato T.

International Journal of Environmental Science and Technology 21 ( 2 ) 1481 - 1492 2023年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

The incorporation of antimicrobial peptides (AMPs) in graphene-based materials is a growing strategy to overcome the shortcomings presented by conventional antimicrobial nanomaterials derived from metal/metal oxide. In this study, novel cyclic undecapeptides CH1 and CW2 (KRQRFYFRQRK and QNKRFYFRKNQ, respectively) were successfully synthesized. The cyclic peptides were then immobilized on the reduced graphene oxide (rGO) surface using a water-soluble carbodiimide (EDCI/HCl) linker. The structural, morphology, and chemical characterizations of the antimicrobial graphene material were carried out using SEM, Raman, FTIR, XRD, and XPS. From our result, the peptide/rGO composite showed an improved antibacterial effect towards gram-positive (Staphylococcus aureus) and gram-negative (Pseudomonas aeruginosa). The enhanced antibacterial property is attributed to the synergistic effect of the sharp edges of rGO and the amphipathic moieties of the cyclic peptides.

DOI： 10.1007/s13762-023-05035-z

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Magnetic Domain Observation of Milled Nanocrystalline Alloy Powder 査読有り国際誌

Takezawa M., Nagaki T., Motozuka S., Sasaki I., Ando Y., Narahara H., Mori N., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T.

2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings 2023年01月

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）

Fe-based nanocrystalline alloys have high magnetic flux density and low loss. So, in this study, the magnetic domain structure of ball-milled magnetic powders of these nanocrystalline alloys was observed using a Kerr effect microscope. The effect of strain removal heat treatment on the magnetic properties of the powder was also investigated by observing and comparing the magnetic domain structure of the milled powder before and after heat treatment during the preparation process of the nanocrystalline milled powder. Our findings showed that the strain removal heat treatment changed the size and shape of the magnetic domains to a simple structure. In addition, the magnetic wall motion was found to occur quickly, resulting in soft magnetic properties.

DOI： 10.1109/INTERMAGShortPapers58606.2023.10228715

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85172725611&origin=inward

Microstructure and Magnetic Characterization on Ball-milled Fe-based Nanocrystalline Alloy Sheet 査読有り国際誌

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings 2023年01月

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）

To realize the effective utilization of the end material and its application to a soft magnetic composite, Fe-based nanocrystalline alloy sheets were ball-milled, and platelet particles were obtained, in this work. Instrumental analyses revealed that although a micro strain was introduced into the nanocrystalline α-Fe grains in the achieved alloy powder, almost no changes were found in the amorphous part filled among the grains. The ball-milling treatment greatly increased the coercive force of the pulverized nanocrystalline sheet. Although the coercive force of the alloy powder decreased after the heat treatment, the coercive force remained to be approximately 10 times higher than that of the heat-treated alloy sheet without the ball-milling treatment, even after the heat treatment. The magnetic process of the ball-milled and heat treated nanocrystalline alloy powder will be discussed in detail in the conference based on the obtained results and Lorentz transmission electron microscopy.

DOI： 10.1109/INTERMAGShortPapers58606.2023.10228768

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Microstructure and Magnetic Characterization on Ball-Milled Fe-Based Nanocrystalline Alloy Sheet 査読有り国際誌

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

Digests of the Intermag Conference 2023-May 2023年01月

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）

In this work, ball-milled iron (Fe)-based nanocrystalline alloy sheets and obtaining platelet particles are used to effectively utilize the end material and apply it to a soft magnetic composite. The instrumental analysis results reveal that, although a microstrain is introduced into the nanocrystalline α-Fe grains in the achieved alloy powder, the amorphous part filled among the grains experiences almost no change. The ball-milling treatment greatly increases the coercive force of the pulverized nanocrystalline sheet. Although the coercive force of the alloy powder decreases after the heat treatment, it remained approximately 10 times higher than that of the heat-Treated alloy sheet without the ball-milling treatment, even after the heat treatment. The magnetic process of the ball-milled and post-Annealed nanocrystalline alloy powder is discussed based on the results of the synchrotron radiation X-ray analysis and transmission electron microscopy with the Lorentz technique.

DOI： 10.1109/INTERMAG50591.2023.10265082

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A route towards graphene from lignocellulosic biomass: Technicality, challenges, and their prospective applications 査読有り国際誌

Ahmad Farid M.A., Andou Y.

Journal of Cleaner Production 380 2022年12月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

As a result of its carbon-dense structure and renewable nature, lignocellulosic biomass has emerged as a novel source for the production of graphene. At sufficient heat, biopolymers (cellulose, hemicellulose, and lignin) can be disintegrated into three-dimensional turbostratic crystallites, consisting of partially defective carbon sheets of aromatic rings (graphite-like material) via pyrolysis, where it may serve as a precursor in graphene synthesis. There are several techniques employed for graphene synthesis from lignocellulosic biomass; carbonization, graphitization, hydrothermal carbonization, chemical activation, chemical blowing technique, template-based confinement, mechanical and chemical exfoliation, and carbon growth via chemical vapor deposition. This review offers an insight into lignocellulosic biomass compositions and those aforementioned mechanisms to produce graphene-based materials, which cover various parameters and properties outcomes. A summary of their applications prospect, environmental impacts, economic concerns and production challenges is also presented.

DOI： 10.1016/j.jclepro.2022.135090

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Surface Modification of a Regenerated Cellulose Film Using Low-Pressure Plasma Treatment with Various Reactive Gases 査読有り国際誌

Kawano T., Wang M.J., Andou Y.

ACS Omega ( American Chemical Society (ACS) ) 7 ( 48 ) 44085 - 44092 2022年12月

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）

There is a growing interest in the fabrication of membranes and packaging materials from natural resources for a sustainable society. A regenerated cellulose (RC) film composed solely of cellulose has outstanding advantages including biodegradability, transparency, mechanical strength, and thermal stability. To expand the application of the RC film, various surface modification methods have been proposed. However, conventional chemical methods have disadvantages such as environmental burden and difficulty in controlling the reaction. In this work, low-pressure plasma treatment, a green, solvent-free, and easily controllable approach, was performed for surface modification of the RC film. The effects of three different plasma species (O2, N2, and CF4) and treatment conditions on the surface properties of RC films were investigated based on water contact angle measurements, chemical composition analysis, and surface topography. O2and N2plasma treatment slightly enhanced the surface wettability of RC films due to the etching by the plasma reactive species and the formation of new hydrophilic functional groups. In CF4plasma treatments, the hydrophobic surface with a contact angle of 120.6° was obtained in a short treatment time (60 s) owing to the deposition of fluorocarbon groups on the surface. However, the treated surface in a longer reaction time resulted in increased wettability due to the diffusion and degradation of fluorine-containing bonds. The new insights could be valuable for further studies of surface modification and functionalization of RC films.

DOI： 10.1021/acsomega.2c05499

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Surface Modification of a Regenerated Cellulose Film Using Low-Pressure Plasma Treatment with Various Reactive Gases 査読有り国際誌

Tessei Kawano, Meng-Jiy Wang, Yoshito Andou

ACS Omega 2022年11月

Investigation on the Redox Properties of a Novel Cu-Based Pr-Modified Oxygen Carrier for Chemical Looping Combustion 査読有り国際誌

Qasim M., Ayoub M., Aqsha A., Ghazali N.A., Ullah S., Ando Y., Farrukh S.

ACS Omega 7 ( 45 ) 40789 - 40798 2022年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

CO2levels in the atmosphere are growing as a result of the burning of fossil fuels to meet energy demands. The introduction of chemical looping combustion (CLC) as an alternative to traditional combustion by transporting oxygen emphasizes the need to develop greener and more economical energy systems. Metal oxide, also defined as an oxygen carrier (OC), transports oxygen from the air to the fuel. Several attempts are being made to develop an OC with a reasonable material cost for superior fuel conversion and high oxygen transport capacity (OTC). This study aims to synthesize a potential OC using the wet impregnation method for the CLC process. Thermogravimetric analysis (TGA) was used to determine the cyclic redox properties using 5% CH4/N2and air as reducing and oxidizing gases, respectively. The 10CuPA-based OC retained a high OTC of about 0.0267 mg O2/mg of OC for 10 cycles that was higher than 10CuA-based OC. Furthermore, the oxygen transfer rate for 10CuPA-based OC was relatively higher compared to 10CuA-based OC over 10 cycles. In comparison to 10CuA-based OC, the 10CuPA-based OC presented a steady X-ray diffraction (XRD) pattern after 10 redox cycles, implying that the phase was stably restored due to praseodymium-modified γalumina support.

DOI： 10.1021/acsomega.2c02993

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