研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

分割表示453 件中 141 - 160 件目／全件表示 >>

Theoretical study of the mechanism of methanol oxidation on PtNi catalyst 査読有り

Liu A., Yang Y., Shi D., Ren X., Ma T.

Inorganic Chemistry Communications 123 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The anodic methanol oxidation reaction (MOR) generates a toxic intermediate CO in direct methanol fuel cell (DMFC), where the Pt catalyst is easily deactivated and the catalytic activity will be inevitably lowered. Alloying modification is an important approach to improve the anti-CO ability of Pt catalyst. In this work, MOR mechanism on PtNi catalyst is theoretically studied on four crystal planes doped with one-to-three Ni atoms. The main path of CO poisoning on the catalyst surface: CH3OH → CH2OH → CHOH → CHO → CO was studied. Meanwhile, the adsorption of PtNi catalyst on the reaction intermediate was carried out. Based on the relative energy ΔE, the four optimal catalysts were compared for MOR. Building on the above comprehensive evaluations the appropriate catalysts were finally selected by the activation effect. It is proved by calculation that the selected 1,2,3Ni-Pt (2 0 0) reduces the relative energy of the overall reaction path, possessing good catalytic effect on MOR with certain anti-CO toxicity.

DOI： 10.1016/j.inoche.2020.108362

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Electrocatalytic Synthesis of Ammonia Using a 2D Ti<inf>3</inf>C<inf>2</inf> MXene Loaded with Copper Nanoparticles 査読有り

Liu A., Liang X., Yang Q., Ren X., Gao M., Yang Y., Ma T.

ChemPlusChem 86 ( 1 ) 166 - 170 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

As an energy-saving and environmentally friendly ammonia synthesis method, electrocatalytic nitrogen reduction reaction (NRR) has received a great deal of attention. There is thus an urgent need to find high-efficiency electrocatalysts for the NRR. In this work, a Cu/Ti3C2 composite catalyst was prepared and demonstrated excellent selectivity under environmental conditions, which could efficiently convert N2 into NH3 electrochemically. In 0.1 M KOH, Cu/Ti3C2 can achieve a high Faradaic efficiency of 7.31 % and a high NH3 production rate of 3.04 μmol h−1 cm−2 at −0.5 V vs. RHE. Moreover, the material also exhibits superior electrochemical stability and durability. At the same time, density functional theory (DFT) shows that, compared with Ti3C2, Cu/Ti3C2 exhibits a wider conduction and valence band and a larger Fermi level, thus indicating that Cu plays a vital role in the enhancement of the catalytic activity and conductivity of Ti3C2-based materials. This work provides a feasible strategy for designing high-efficiency MXene-based NRR electrocatalysts.

DOI： 10.1002/cplu.202000702

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Double shelled hollow CoS<inf>2</inf>@MoS<inf>2</inf>@NiS<inf>2</inf> polyhedron as advanced trifunctional electrocatalyst for zinc-air battery and self-powered overall water splitting 査読有り

Liu X., Yin Z., Cui M., Gao L., Liu A., Su W.N., Chen S., Ma T., Li Y.

Journal of Colloid and Interface Science 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Electrocatalysts play important role in various energy conversion and storage devices. The catalytic performance of electrocatalysts can be enhanced through the increasement of intrinsic catalytic activity by optimizing electronic structure and the improvement of exposed active sites by designing proper nanostructures. In this work, CoS2@MoS2@NiS2 nano polyhedron with double-shelled structure was prepared using metal organic framework as a precursor. Due to the rational integration of multifunctional active center, the strong electronic interaction of the various component, the high electrochemical surface area and shortened mass transport induced by the special structure, CoS2@MoS2@NiS2 exhibits high catalytic activity for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Specifically, low overpotentials of 156 and 200 mV was achieved to deliver a current density of 10 mA cm−2 for HER and OER, and a high half-wave potential of 0.80 V was observed for ORR. More importantly, the Zn-air battery assembled by CoS2@MoS2@NiS2 exhibits a high-power density of 80.28 mW cm−2 and could effectively drive overall water splitting. This work provides a new platform for designing multifunctional catalysts with high activity for energy conversion and storage.

DOI： 10.1016/j.jcis.2021.11.115

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Two-Dimensional Cu<inf>2</inf>MoS<inf>4</inf>-Loaded Silicon Nanospheres as an Anode for High-Performance Lithium-Ion Batteries 査読有り

Liu H., Chen Y., Zhao Y., Liu K., Guo X., Meng X., Ma T.

ACS Applied Energy Materials 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Silicon-based anode materials have a theoretical capacity 10 times that of commercial graphite and have attracted attention. Herein, a creative and effective strategy is elaborated for the synthesis of composite Cu2MoS4/SiNS materials through the self-assembly of silicon nanospheres and a two-dimensional Cu2MoS4 material. The porous silicon dispersed in the two-dimensional layered structure can effectively release the volume expansion and mechanical stress generated, which can also provide further active sites and fast channels for Li+ transmission, and improve the conductivity of the material. As expected, when used as the anode of lithium-ion batteries, the Cu2MoS4/SiNS material exhibited a highly improved electrochemical performance. Benefitting from the unique structural features, the Cu2MoS4/SiNS material showed a discharge specific capacity of 1920 mAh g-1 at 100 mA g-1 and an excellent rate capability of 1330 mAh g-1 at 1.0 A g-1 after 100 cycles. When the current density was further increased to 2.0 A g-1 to test the fast charging performance of the Cu2MoS4/SiNS material, we obtained a specific capacity of 1180 mAh g-1 with 69.2% capacity retention that could still be maintained after 400 cycles. The ultrastable properties and superior capacity of the composite material provide the potential direction for the construction of high-performance lithium-ion batteries.

DOI： 10.1021/acsaem.1c02697

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Highly Reversible Zn Metal Anode Stabilized by Dense and Anion-Derived Passivation Layer Obtained from Concentrated Hybrid Aqueous Electrolyte 査読有り

Olbasa B.W., Huang C.J., Fenta F.W., Jiang S.K., Chala S.A., Tao H.C., Nikodimos Y., Wang C.C., Sheu H.S., Yang Y.W., Ma T.L., Wu S.H., Su W.N., Dai H., Hwang B.J.

Advanced Functional Materials 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Zinc metal is considered a promising anode material for aqueous zinc ion batteries. However, it suffers from dendrite growth, corrosion, and low coulombic efficiency (CE) during plating/stripping. Herein, a concentrated hybrid (4 m Zn(CF3SO3)2 + 2 m LiClO4) aqueous electrolyte (CHAE) to overcome the challenges facing the Zn anode is reported. The developed electrolyte achieves dendrite-free Zn plating/stripping and obtains an excellent CE of ≈100%, surpassing the previously reported values. The combination of synchrotron-based in operando transmission X-ray microscopy, X-ray diffraction, and ex situ X-ray photoelectron spectroscopy analyses indicate that the denser, anion-derived passivation layer formed using the CHAE facilitates homogeneous current distribution and better prevents freshly deposited Zn from directly contacting the electrolyte than the looser, solvent-derived layers formed from a dilute hybrid aqueous electrolyte (DHAE). The beneficial effects of the CHAE on the compact, dense, and stable salt-anion-derived passivation layer can be attributed to its unique solvation structure, which suppresses the water-related side reactions and widens the electrochemical potential window. In the hybrid Zn||LiFePO4 configuration, the CHAE-based cell delivered a stable performance of CE >99% and capacity retention >90% after 285 cycles. In contrast, the DHAE-based cell exhibits capacity retention of <65% after 170 cycles.

DOI： 10.1002/adfm.202103959

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Carrier Transport Layer-Free Perovskite Solar Cells 査読有り

Wang L., Yang S., Han Q., Yu F., Zhang H., Cai X., Zhang C., Gao L., Ma T.

ChemSusChem 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Power conversion efficiencies (PCEs) of up to 25.5 % have been reported for perovskite solar cells (PSCs). Thus, they have shown great potential for commercial applications. Therefore, simplifying technological process and reducing production costs have been a widespread concern among scientific and industrial communities. In this study, PSCs are prepared with the simplest device architecture (FTO/MAPbI3/carbon). A high-quality perovskite film with few interface defects and good carrier transport is obtained by tuning the p-n properties, matching energy levels, and enhancing carrier collection and transport. A PCE of 12.01 % is achieved, which is the best reported to date for this device structure. The device also shows excellent long-term stability, owing to the elimination of charge transport layers and the usage of hydrophobic materials. This study provides a new approach to reduce production costs and simplify production of PSCs.

DOI： 10.1002/cssc.202101592

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Bimetallic Sulfide SnS<inf>2</inf>/FeS<inf>2</inf>Nanosheets as High-Performance Anode Materials for Sodium-Ion Batteries 査読有り

Chen Y., Liu H., Guo X., Zhu S., Zhao Y., Iikubo S., Ma T.

ACS Applied Materials and Interfaces 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Transition-metal sulfide SnS2 has aroused wide concern due to its high capacity and nanosheet structure, making it an attractive choice as the anode material in sodium-ion batteries. However, the large volume expansion and poor conductivity of SnS2 lead to inferior cycle stability as well as rate performance. In this work, FeS2 was in situ introduced to synchronously grow with SnS2 on rGO to prepare a heterojunction bimetallic sulfide nanosheet SnS2/FeS2/rGO composite. The composition and distinctive structure facilitate the rapid diffusion of Na+ and improve the charge transfer at the heterogeneous interface, providing sufficient space for volume expansion and improving anode materials' structural stability. SnS2/FeS2/rGO bimetallic sulfide electrode boasts a capacity of 768.3 mA h g-1 at the current density of 0.1 A g-1, and 541.2 mA h g-1 at the current density of 1 A g-1 in sodium-ion batteries, which is superior to that of either single metal sulfide SnS2 or FeS2. TDOS calculation further confirms that the binding of FeS2/SnS2-Na is more stable than FeS2 and SnS2 alone. The superior electrochemical performance of the SnS2/FeS2/rGO composite material makes it a promising candidate for sodium storage.

DOI： 10.1021/acsami.1c08801

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Surface Management for Carbon-Based CsPbI<inf>2</inf>Br Perovskite Solar Cell with 14% Power Conversion Efficiency 査読有り

Yu F., Han Q., Wang L., Yang S., Cai X., Zhang C., Ma T.

Solar RRL 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Carbon-based hole transport material (HTM)-free CsPbI2Br perovskite solar cells (C-PSCs) have garnered considerable attention due to their super thermal stability. The energy-level mismatch between the CsPbI2Br perovskite and carbon electrodes, however, results in major energy loss and reduced power conversion efficiency (PCE) of C-PSCs. Herein, 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) is used to manage the energy level, reduce defect densities, and improve the interface quality between CsPbI2Br and carbon electrodes. Preliminary results demonstrate that the BMIMBF4 modifier can passivate the surface defects of the perovskite film and reduce the energy-level mismatch between the CsPbI2Br layer and the carbon electrode. A PCE of 14.03% is achieved by introducing BMIMBF4 which is improved by 23% compared with the control device (11.37%). Moreover, stability—whether in the case of C-PSCs or CsPbI2Br films—is also improved.

DOI： 10.1002/solr.202100404

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Recent Progresses in Carbon Counter Electrode Materials for Perovskite Solar Cells and Modules 査読有り

Xu C., Zhao X., Ma J., Guo J., Ma T., Wu M.

ChemElectroChem 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

Though perovskite solar cells (PSCs) or modules (PSMs) are being developed at an unprecedented speed, several obstacles remain to their commercialization. One of the difficult problems is the expensive and unstable Au and Ag counter electrode. Therefore, highly effective, stable, and low-cost counter electrode materials should be explored. Among various counter electrode materials, carbon is one of the most promising substitutes for their rich sources, low cost, outstanding electrochemical performance, and diversified surface functions. This review summarizes recent achievements of carbon counter electrode materials, which included commercial carbon paste, carbon black, graphite, graphene, carbon nanotubes and their synthetic approaches, modifications, and structure-function relationships. Moreover, large-scale carbon counter electrode in PSCs or PSMs are specifically discussed. Hopefully, this recapitulative analysis will draw the attention of relevant researchers to re-understand the importance of counter electrode and clarify what should be noticed to develop qualified counter electrode materials for PSCs or PSMs.

DOI： 10.1002/celc.202100811

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Mechanism of Enhancement in Perovskite Solar Cells by Organosulfur Amine Constructed 2D/3D Heterojunctions 査読有り

He Z., Zhou Y., Xu C., Su Y., Liu A., Li Y., Gao L., Ma T.

Journal of Physical Chemistry C 2021年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Constructing a 2D/3D heterojunction perovskite that could remain highly efficient and improve the stability of perovskite solar cells (PSCs) is explored. In this paper, we compared 2D/3D heterojunction perovskite films passivated by organosulfur and commonly used organic amine salts. Results indicated that the perovskite film passivated by organosulfur amine salts had a lower trap state density, longer carrier lifetime, improved energy level alignment, and higher thermal and moisture stability. An approximate 21% power conversion efficiency (PCE) was obtained in the champion device. After the comparison, the passivation mechanism of the organosulfur 2D/3D heterojunction was proposed.

DOI： 10.1021/acs.jpcc.1c04343

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Metal-Organic-Framework-Derived Cobalt-Doped Carbon Material for Electrochemical Ammonia Synthesis under Ambient Conditions 査読有り

Liu A., Liang X., Yang Q., Ren X., Gao M., Yang Y., Ma T.

ChemElectroChem 7 ( 24 ) 4900 - 4905 2020年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Electrocatalytic nitrogen reduction reaction (NRR), as a potential alternative to industrial ammonia synthesis (Haber-Bosch method), can achieve “green” and sustainable ammonia production under environmental conditions. However, the NRR process is still limited by the slow cleavage of the N≡N triple bond and the existence of a competitive hydrogen evolution reaction. For this reason, many researchers have studied the construction and synthesis of high-efficiency nitrogen reduction electrocatalysts. Herein, a Co-based metal-organic framework (ZIF-67) was used to prepare Co/C-900 composites through high-temperature pyrolysis (900 °C) for ammonia synthesis under environmental conditions. The Co/C-900 catalysts exhibited excellent NRR performance, with a high NH3 yield of 4.66 μmol cm−2 h−1 at −0.3 V (vs. RHE) and a faradaic efficiency of 11.53 % in 0.1 M potassium hydroxide. This work provides a simple strategy for the design of porous, non-noble-metal electrocatalysts for electrochemical NRR.

DOI： 10.1002/celc.202001332

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Hierarchical porous architectures derived from low-cost biomass equisetum arvense as a promising anode material for lithium-ion batteries 査読有り

Chen Y., Liu H., Jiang B., Zhao Y., Meng X., Ma T.

Journal of Molecular Structure 1221 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Biomass-derived carbonaceous materials as anodes for Lithium-ion batteries have been paid much attention due to the low cost and Environmental-friendly. So far, Equisetum Arvense (EQ), wide grass as anode electrodes of Li-ion battery has not been reported. The Equisetum Arvense (>30 wt% silica) is one of the highest Si accumulators in the plant kingdom with a widely distributed and strong reproductive ability. In this work, we used ZnCl2 as an activator during carbonization and obtained a hierarchically porous structure with a high specific surface area. When taken as an anode in Li-ion batteries, it exhibits remarkable capacities (773 mA h g−1 at 0.1 A g−1) following 100 cycles and desirable rate performance (472 mA h g−1 at 1 A g−1). The hierarchical structure and naturally dispersed carbon network in this SiOx/C composite can provide stable solid electrolyte interphase, maintain its structural integrity and improve the electronic and ionic conductivity, thus ensuring an excellent electrochemical performance. The proposed SiOx/C composite has a bright future for next-generation LIBs anodes with environmental-friendly and large-scale (low-cost) production.

DOI： 10.1016/j.molstruc.2020.128794

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Bimetallic cobalt molybdenum carbide–cobalt composites as superior bifunctional oxygen electrocatalysts for Zn–air batteries 査読有り

Li Y., Yin Z., Cui M., Chen S., Ma T.

Materials Today Energy 18 2020年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Designing composite material that contains high-active oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) species is an effective strategy for synthesizing bifunctional electrocatalysts for Zn–air batteries. In this work, we first reported the preparation of the Co6Mo6C2–Co@NC nanorod composite by using the Mo-polydopamine@ZIF-67 composite as the precursor. Because of the highly active Co6Mo6C2 for OER and the high-active Co for ORR, the Co6Mo6C2–Co@NC exhibits superior OER activity, with a low overpotential of 268 mV at 10 mA cm−2, and high ORR performance. When used as bifunctional electrocatalysts for the Zn–air battery, the battery exhibits a high open-circuit voltage of 1.38 V and a specific capacity of 760 mA/h/g, as well as very high stability of up to 300 h with no obvious increase in charge–discharge voltage gap.

DOI： 10.1016/j.mtener.2020.100565

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Metal-organic framework based bifunctional oxygen electrocatalysts for rechargeable zinc-air batteries: Current progress and prospects 査読有り

Li Y., Cui M., Yin Z., Chen S., Ma T.

Chemical Science 11 ( 43 ) 11646 - 11671 2020年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 The Royal Society of Chemistry. Zinc-air batteries (ZABs) are regarded as ideal candidates for next-generation energy storage equipment due to their high energy density, non-toxicity, high safety, and environmental friendliness. However, the slow oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) kinetics on the air cathode limit their efficiency and the development of highly efficient, low cost and stable bifunctional electrocatalysts is still challenging. Metal-Organic Framework (MOF) based bifunctional oxygen electrocatalysts have been demonstrated as promising alternative catalysts due to the regular structure, tunable chemistry, high specific surface area, and simple and easy preparation of MOFs, and great progress has been made in this area. Herein, we summarize the latest research progress of MOF-based bifunctional oxygen electrocatalysts for ZABs, including pristine MOFs, derivatives of MOFs and MOF composites. The effects of the catalysts' composites, morphologies, specific surface areas and active sites on catalytic performances are specifically addressed to reveal the underlying mechanisms for different catalytic activity of MOF based catalysts. Finally, the main challenges and prospects for developing advanced MOF-based bifunctional electrocatalysts are proposed.

DOI： 10.1039/d0sc04684a

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Comparison of interfacial bridging carbon materials for effective carbon-based perovskite solar cells 査読有り

Gao L., Hu J., Meng F., Zhou Y., Li Y., Wei G., Ma T.

Journal of Colloid and Interface Science 579 425 - 430 2020年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier Inc. As a hole transport materials (HTMs) and noble-metal free perovskite solar cells (PSCs), carbon-based PSCs (C-PSCs) have drawn much attention due to its low cost and excellent stability. The interfacial engineering, between perovskite and counter electrodes (CEs), played a crucial role in charge collection and affected the performance of C-PSCs. Herein, the systematic investigation of interfacial bridging carbon materials has been carried out to improve the interfacial contact. Results demonstrated that the morphology of interfacial bridging carbon materials played more important role than their energy band and conductivity, where carbon nanotube (CN) showed much better interfacial bridging effect and energy level alignment than other carbon materials. We achieved both the high power conversion efficiency (PCE) (15.09%) and stability in C-PSCs without HTMs due to the optimal interfacial bridging carbon material. It could retain 67% of their initial PCE after storing for 340 h under the rigorous environmental condition without any encapsulation (air atmosphere, 85 °C, 65% RH).

DOI： 10.1016/j.jcis.2020.06.090

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Bifunctional organic disulfide for high-efficiency and high-stability planar perovskite solar cells 査読有り

Wang L., Yang S., Han Q., Yu F., Cai X., Liu F., Zhang C., Ma T.

ACS Applied Energy Materials 3 ( 10 ) 9724 - 9731 2020年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, we used a bifunctional organic disulfide, di-5-(1-methyltetrazole) disulfide (T2), in perovskite films to improve the performance and stability of planar perovskite solar cells (PSCs). The results indicate two major functions of T2 in PSCs: improving the perovskite crystal quality due to the interaction between T2 and perovskite and eliminating Pb0 and I0 defects by redox reaction, allowing for the regeneration of T2 in the process. We achieved a power conversion efficiency (PCE) of PSCs with T2 of 20.67%, a 15% increase compared to the control device (17.9%). Furthermore, PSC devices with T2 exhibited enhanced operational stability and storage stability. During 140 s of operation, there was no evident decrease of PCE. The device maintained 95% of its initial efficiency without encapsulation under ambient conditions (20 °C, 40% humidity) for 2 months.

DOI： 10.1021/acsaem.0c01329

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Novel Lead-Free Material Cs<inf>2</inf>PtI<inf>6</inf>with Narrow Bandgap and Ultra-Stability for Its Photovoltaic Application 査読有り

Yang S., Wang L., Zhao S., Liu A., Zhou Y., Han Q., Yu F., Gao L., Zhang C., Ma T.

ACS Applied Materials and Interfaces 12 ( 40 ) 44700 - 44709 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2020 American Chemical Society. Lead halide perovskite has in recent years gained widespread interest due to its excellent physical and chemical properties, as well as superior optoelectronic performance. However, some restrictions still preclude full industrialization of the material, in particular toxicity issues and instability as a result to sensitivity to humidity. Lead-free all-inorganic double perovskite materials have thus recently become a focus of research. Herein, a new narrow bandgap lead-free double perovskite solar cell with a high-quality Cs2PtI6 film is proposed. It exhibits an optical bandgap of 1.37 eV, absorption within a wide range of wavelengths, and a high absorption coefficient. Following optimization, the device displays a best power conversion efficiency of 0.72% with an open-circuit voltage of 0.73 V, a short-circuit current of 1.2 mA/cm2, and a fill factor of 0.82. Crucially, it also demonstrates excellent stability when exposed to extreme conditions such as high humidity, high temperature, and UV-light irradiation. Stability tests show that the PSCs can retain almost 80% of the original efficiency over 60 days stored in ambient temperature without any encapsulation, boosting prospects for applications of lead-free perovskite solar cells.

DOI： 10.1021/acsami.0c11429

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DFT study of Ru/graphene as high-performance electrocatalyst for NRR 査読有り

Liu A., Gao M., Gao Y., Ren X., Yang Y., Yang Q., Li Y., Gao L., Liang X., Ma T.

Inorganic Chemistry Communications 120 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier B.V. As a more common catalyst material in nitrogen reduction reactions (NRR), Ru has high activity and considerable catalytic performance, but it is expensive with scarce reserves. These factors limit the development of Ru in NRR, how to reduce costs and increase the utilization of precious metals is a problem facing the development of Ru-based catalysts. Graphene is considered as a promising carrier material, which can increase the specific surface area and dispersibility of the catalyst, thereby improving the utilization rate of materials. Therefore we combined these two materials and studied the mechanism of NRR occurred on Ru/graphene (Gr) catalysts by density functional theory (DFT) method. The effects of different numbers of Ru atoms and Ru atom distribution on the catalytic activity of Ru/Gr catalyst were calculated. A series of data such as the adsorption free energy and reaction path were obtained. The final results show that the double Ru supported graphite nitrogen doped Gr with single adsorption process and the three Ru supported pyrrole nitrogen doped Gr with double adsorption process have the best NRR activity. Compared with catalyst-free process, the presence of the catalyst effectively reduces the reaction energy barrier and improves the reaction activity. The research results provide guidance for the design and preparation of high-performance NRR catalysts to a certain extent.

DOI： 10.1016/j.inoche.2020.108169

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Two-dimensional CuAg/Ti<inf>3</inf>C<inf>2</inf>catalyst for electrochemical synthesis of ammonia under ambient conditions: a combined experimental and theoretical study 査読有り

Liu A., Yang Q., Ren X., Gao M., Yang Y., Gao L., Li Y., Zhao Y., Liang X., Ma T.

Sustainable Energy and Fuels 4 ( 10 ) 5061 - 5071 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Royal Society of Chemistry 2020. The Haber-Bosch process is one of the most widely utilized approaches for the synthesis of ammonia, and has many disadvantages, such as the high energy consumption and generation of large amounts of greenhouse gases. Therefore, the electrochemical nitrogen reduction reaction (NRR) has received significant attention, as it is more sustainable and environmentally friendly. In this study, we report a CuAg/Ti3C2MXene catalyst for the electrocatalytic NRR. This MXene-based composite material exhibits remarkable performance for electrochemical synthesis of ammonia under ambient conditions. When measured in a 0.1 M KOH solution at an applied potential of −0.5 Vvs.reversible hydrogen electrode (RHE), the catalyst achieved an ammonia production rate and faradaic efficiency of 4.12 μmol cm−2h−1and 9.77%, respectively. These values indicate excellent stability and selectivity compared with the previously reported 2D NRR electrocatalysts. Moreover, the results of density functional theory calculations illustrate that with preferable adsorption of N2, desorption of NH3, and suppression of the HER, CuAg/Ti3C2is a promising catalyst for the NRR. The excellent electrical conductivity and fast electron transport in the CuAg/Ti3C2catalyst are favorable for the evaluated electrocatalytic reaction. Both experimental results and DFT calculations reveal that CuAg plays a crucial role in the catalytic activity and electrical conductivity enhancement for Ti3C2based materials.

DOI： 10.1039/d0se00915f

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85090941665&origin=inward

A facile and general procedure to hyperporous carbons: carbonization of organic zinc salts 査読有り

Chen S., Huang H., Li Y., Ma T.

Materials Today Energy 17 2020年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier Ltd A facile, one step procedure is proposed to prepare hyperporous carbons by using zinc organic salts as precursors. The volatile character of zinc at high temperature not only leads to high specific surface area, but also avoids the post-washing step after carbonization. The pore texture of the carbons can be easily turned by using different precursor and the factors that affect the porosity are examined in detail. It is found that a precursor with a high Zn/C ratio and chain-like structure tends to form high specific surface area carbons. The carbons show high potential when used for CO2 capture and electrode material of supercapacitor. Especially for Zn–C–C derived from zinc citrate, shows a high specific surface area of 2933 cm3 g−1, a high CO2 uptake of 88 cm3 g−1 at 298 K and a high capacitance of 260 F g−1 at a current density of 1 A g−1. We believe that by choosing proper Zn organic salts precursors, carbonaceous materials with properties that surpass those reported here can be prepared and more application fields are waited to be extended by these carbons.

DOI： 10.1016/j.mtener.2020.100446

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85086071092&origin=inward

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