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Journal of Materials Science & Technology 2020年第3期38卷 221-236页

作者： Mengmeng Zhang Xiaopeng Li Jun Zhao Xiaopeng Han Cheng Zhong Wenbin Hu Yida Deng School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)Tianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China

surface/interface engineering plays an important role in improving the performance and economizing the cost and usage of electrocatalysts.In recent years,substantial progress has been achieved in designing and developing highly active electrocatalysts with the deepening understanding of surface and interface enhanced mechanism.In this review,recent development about optimizing the surface and interfacial structure in promoting the electrocatalytic activity of noble-metals and transition metal compounds is presented and the chemical enhancements are also described in detail.The relationship between the surface/interface structures(both atomic and electronic configuration)and the electrochemical behaviors has been discussed.Finally,personal perspectives have been proposed,highlighting the challenges and opportunities for future development in tuning the surface/interface active sites of electrocatalysts.We believe that this timely review will be beneficial to the construction of highly active and durable electrode materials through optimizing surface atomic arrangement and interfacial interaction,which can largely promote the development of next-generation clean energy conversion technologies.

关键词： surface/interface engineering Noble metals Transition metals compounds Electrocatalytic reactions

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在析氧反应中,直接动态观测Ni_(3)N-Co_(3)N/CC表面重构和活性物质

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Science China Materials 2022年第9期65卷 2445-2452页

作者：秦萍宋豪阮庆东黄陟峰徐月黄超 Department of Physics Hong Kong Baptist UniversityKowloon TongKowloonHong Kong SARChina Department of Physics City University of Hong KongTat Chee AvenueKowloonHong KongChina The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

电解水反应包括析氢和析氧反应.相对于2电子转移的析氢反应,4电子转移的析氧反应比较缓慢.因此,理解析氧反应机制有助于设计高效电催化剂.其中析氧反应机制可以分为传统吸附机制和直接氧析出机制.在本文中,我们将蜂窝状Ni_(3)N-Co_(3)N... 详细信息

电解水反应包括析氢和析氧反应.相对于2电子转移的析氢反应,4电子转移的析氧反应比较缓慢.因此,理解析氧反应机制有助于设计高效电催化剂.其中析氧反应机制可以分为传统吸附机制和直接氧析出机制.在本文中,我们将蜂窝状Ni_(3)N-Co_(3)N生长在碳布上来调研其直接氧析出机制.密度泛函理论和原位拉曼证明了Ni_(3)N-Co_(3)N在反应过程中是直接氧析出机制,其中Ni_(3)N和Co_(3)N共同拉拽OH^(-)、劈裂H-O和吸附另外的OH^(-)基团,从而降低了反应活化能.不仅如此,蜂窝状结构和导电基体有助于结构稳定和提高氧气释放速率.因此,Ni_(3)N-Co_(3)N/CC在10和100 mA cm^(-2)电流密度下提供了320和495 mV的小过电势.同时,它也拥有更好的长期稳定性.

关键词： oxygen evolution reaction Ni_(3)N-Co_(3)N/CC surface/interface direct O_(2)evolution mechanism

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Analytic solution for a circular nano-inhomogeneity in a finite matrix

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Nano Materials Science 2019年第2期1卷 116-120页

作者： Shuang Wang Zengtao Chen Cunfa Gao State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Mechanical Engineering University of Alberta Edmonton AB T6G 1H9 Canada

The Gurtin-Murdoch model has found wide applications in analyzing the mechanical behaviors of nanocomposites with surface/interface effect. In the existing literature, the matrix is usually assumed to be infinite and the surface/interface effect is considered only at the inhomogeneity-matrix interface. This assumption is indeed valid as the matrix is usually at macroscale rather than nanoscale. However, if the size of the matrix decreases to the nanoscale too, the surface/interface effect will have to be considered at the outer boundary of the matrix. In this paper, the plane deformation of a circular nano-inhomogeneity embedded inside a finite circular matrix (which implies the matrix is also at nanoscale) is investigated. The stress boundary conditions are given at the inhomogeneity-matrix interface and the outer boundary of the matrix by the G-M model. The analytic solution for the stress field is finally obtained through the complex variable method. The results show that the stress field inside the inhomogeneity is still uniform (size-dependent) when the surface/interface effect is considered. In addition, the stress field inside the bulk (including the inhomogeneity and the matrix) can be influenced not only by the size and elastic constant of the inhomogeneity, but also by those of the matrix.

关键词： Plane problem Nanoscale inhomogeneity Finite matrix surface/interface effect Complex variable methods

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Regulating interfacial chemistry and kinetic behaviors of F/Mo co-doping Ni-rich layered oxide cathode for long-cycling lithium-ion batteries over -20°C–60°C

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Journal of Energy Chemistry 2024年第7期94卷 449-457页

作者： Siqi Guan Lin Tao Pei Tang Ruopian Fang Huize Wu Nan Piao Huicong Yang Guangjian Hu Xin Geng Lixiang Li Baigang An Feng Li Institute of Energy Materials and Electrochemistry Research University of Science and Technology Liaoning Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China School of Chemical Engineering The University of New South Wales Shenyang King Power Tech.Co. Ltd.

Ni-rich layered oxide cathodes have shown promise for high-energy lithium-ion batteries (LIBs) but are usually limited to mild environments because of their rapid performance degradation under extreme temperature conditions (below 0°C and above 50°C).Here,we report the design of F/Mo co-doped LiNi0.8Co0.1Mn0.1O2(FMNCM) cathode for high-performance LIBs from-20 to 60°C.F~–doping with high electronegativity into the cathode surface is found to enhance the stability of surface lattice structure and protect the interface from side reactions with the electrolyte by generating a LiF-rich surface layer.Concurrently,the Mo6+doping suppresses phase transition,which blocks Li+/Ni2+mixing,and stabilizes lithium-ion diffusion pathway.Remarkably,the FMNCM cathode demonstrates excellent cycling stability at a high cutoff voltage of 4.4 V,even at 60°C,maintaining 90.6%capacity retention at 3 C after 150cycles.Additionally,at temperatures as low as-20°C,it retains 77.1%of its room temperature capacity,achieving an impressive 97.5%capacity retention after 500 cycles.Such stable operation under wide temperatures has been further validated in practical Ah-level pouch-cells.This study sheds light on both fundamental mechanisms and practical implications for the design of advanced cathode materials for wide-temperature LIBs,presenting a promising path towards high-energy and long-cycling LIBs with temperature adaptability.

关键词： Anion-cation co-doping Ni-rich layered cathode Phase transition surface/interface Wide temperature operation