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In-situ tracking of phase conversion reaction induced metal/metal oxides for efficient oxygen evolution

Science China Materials 2021年第2期64卷 362-373页

作者： Shahid Khan Chao Wang Haoliang Lu Yufeng Cao Zeyang Mao Chenglin Yan Xianfu Wang Soochow Institute for Energy and Materials Innovations College of EnergySoochow UniversitySuzhou215006China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China School of Chemical and Environmental Engineering College of ChemistryChemical Engineering and Material ScienceSoochow UniversitySuzhou215123China

Due to the unique interface and electronic structure,metal/metal oxide composite electrocatalysts have been designed and exploited for electrocatalytic oxygen evolution reaction(OER)in alkaline ***,how to fabricate metal/metal oxides with abundant interfaces and well-dispersed metal phases is a challenge,and the synergistic effect between metal and metal oxides on boosting the electrocatalytic activities is still ***,by controlling the lithium-induced conversion reaction of metal oxides,metal/metal oxide composites with plentiful interfaces and excellent electrical interconnection are fabricated,which can enhance the active sites,and accelerate the mass transfer during the electrocatalytic *** a result,the electrocatalytic oxygen evolution activities of the as-fabricated metal/metal oxide composite catalysts including NiCo/NiCo2O4,NiMn/NiMn2O4 and CoMn/CoMn2O4 are greatly *** catalytic mechanism is also explored using the in-situ X-ray and Raman spectroscopic tracking to uncover the real active centers and the synergistic effect between the metal and metal oxides during water *** functional theory plus U(DFT+U)calculation confirms the metal in the composite can optimize the catalytic reaction path and reduce the reaction barrier,thus boosting the electrocatalytic kinetics.

关键词： in-situ tracking electrochemical conversion reaction metal/metal oxide interfaces electrocatalytic mechanism oxygen evolution

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Ni0.85 Se hexagonal nanosheets as an advanced conversion cathode for Mg secondary batteries

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Journal of Energy Chemistry 2020年第9期29卷 226-232,I0007页

作者： Dong Chen Jingwei Shen Xue Li Shun-an Cao Ting Li Wei Luo Fei Xu Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072HubeiChina Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission Ministry of EducationCollege of Chemistry and Materials ScienceSouth-Central University for NationalitiesWuhan 430074HubeiChina College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072HubeiChina

Mg secondary batteries are promising scalable secondary batteries for next-generation energy ***,Mg-storage cathode materials are greatly demanded to construct high-performance Mg *** conversion reaction provides plenty of cathode options,and strategy for cathode selection and performance optimization is of special *** this work,Ni0.85Se with nanostructures of dispersive hexagonal nanosheets(D-Ni0.85Se)and flower-like assembled nanosheets(F-Ni0.85Se)is synthesized and investigated as Mg-storage *** with F-Ni0.85Se,D-Ni0.85Se delivers a higher specific capacity of 168 mAh g^-1 at 50 mA g^-1 as well as better rate performance,owing to its faster Mg^2+-diffusion and lower resistance.D-Ni0.85Se also exhibits a superior cycling stability over *** investigation on mechanism indicates an evolution of Ni0.85Se towards NiSe with cycling,and the Mg-storage reaction occurs between NiSe and metallic Ni^*** present work demonstrates that advanced conversion-type Mg battery cathode materials could be constructed by soft selenide anions,and the electrochemical properties could be manipulated by rational material morphology optimization.

关键词： Mg secondary batteries electrochemical conversion reaction Ni0.85Se Hexagonal nanosheets Diffusion kinetics

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Carbon Encapsulated Nickel Nanocomposites for the Cathode in Advanced Lithium Sulfur Batteries

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China Petroleum Processing & Petrochemical Technology 2021年第4期23卷 1-6页

作者： Yang Yuxiang Xie Jingxin Wu Genghuang Zhu Na Li Huan Rong Junfeng SINOPEC Research Institute of Petroleum Processing Beijing 100083

Lithium sulfur(Li-S)batteries are poised to be the next generation of high-density energy storage *** recent years,the concept of“electrocatalysis”has been introduced into the field of Li-S batteries,and some transition metals have been proved to catalyze the electrochemical conversion reaction of sulfur *** this study,carbon encapsulated nickel nanoparticles(Ni@C)with a specific surface area of 146 m^(2)/g are shown to play a definitive electrocatalytic role for the sulfur *** Ni@C incorporated,the Ni@C/G-S electrode achieved a better electrochemical performance than the G-S ***,the reversible capacity and cycle stability were further improved through chemical modifications of the carbon *** influence of doping with different elements on the Li-S battery performance was also investigated in *** specific capacities of 1229 mA·h/g,927 mA·h/g,and 830 mA·h/g were achieved at 0.2 C,0.5 C,and 1.0 C for the N-Ni@C-G/S ***,the B-Ni@C-G/S electrode possessed a best cycle stability.

关键词： lithium sulfur batteries electrocatalysis electrochemical conversion reaction Ni@C chemical modifications

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