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Strengthening absorption ability of Co-N-C as efficient bifunctional oxygen catalyst by modulating the d band center using MoC

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Green Energy & Environment 2023年第2期8卷 459-469页

作者： Jianwen Liu Ying Guo Xian-Zhu Fu Jing-Li Luo Chunyi Zhi shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen University518060China Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloon TongHong KongChina Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaT6G 1H9Canada

Co-N-C is a promising oxygen electrochemical catalyst due to its high stability and good ***,due to the limited adsorption ability improvement for oxygen-containing intermediates,it usually exhibits inadequate catalytic activity with 2-electron pathway and high selectivity of hydrogen ***,the adsorption of Co-N-C to these intermediates is modulated by constructing heterostructures using transition metals and their derivatives based on d-band *** heterostructured nanobelts with MoC core and pomegranate-like carbon shell consisting of Co nanoparticles and N dopant(MoC/Co-N-C)are engineered to successfully modulate the d band center of active Co-N-C sites,resulting in a remarkably enhanced electrocatalysis *** optimally performing MoC/Co-N-C exhibits outstanding bi-catalytic activity and stability for the oxygen electrochemistry,featuring a high wave-half potential of 0.865 V for the oxygen reduction reaction(ORR)and low overpotential of 370 mV for the oxygen evolution reaction(OER)at 10 mA cm^(-2).The zinc air batteries with the MoC/Co-N-C catalyst demonstrate a large power density of 180 mW cm^(-2)and a long cycling lifespan(2000 cycles).The density functional theory calculations with Hubbard correction(DFT+U)reveal the electron transferring from Co to Mo atoms that effectively modulate the d band center of the active Co sites and achieve optimum adsorption ability with"single site double adsorption"mode.

关键词： Bifunctional oxygen catalysts Pomegranate-like shell D band theory Enhanced synergistic effect Rechargeable zinc air battery

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Critical Shear Offset of Fracture in a Zr-based Metallic Glass

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Journal of Iron and Steel research International 2016年第1期23卷 53-56页

作者： Zhi-yuan LIU Yong YANG Chain-tsuan LIU shenzhen Key Laboratory of Advanced Manufacturing Technology for Mold & Die Department of Mechanical and Electronic EngineeringShenzhen University Centre for Advanced Structural Materials Department of Mechanical and Biomedical EngineeringCollege of CSECity University of Hong Kong

The nanoscale shear band operation process of Zr_（55）Pd_（10）Cu_（20）Ni_5Al_（10） metallic glass（MG）was reined in by constant force during well-designed loading-holding-unloading cyclic microcompression *** the test,it is revealed that the whole shear banding process involves three stages：shear band initiation,shear sliding and shear band *** on the energy balance principle,the size-affected speed of shear sliding is *** energy originated from the shear sliding leads to heat-up of the shear plane;therefore,the temperature in shear band increases with the size of shear offset caused by the energy accumulation during shear *** the glass transition temperature as the critical temperature of fracture for the Zr-based MG,the critical shear offset is predicted to be approximately 190μm,fully in line with the experimental *** directly proved that the fracture of the MG is caused by the temperature rise during shear sliding.

关键词： metallic glass shear band fracture temperature rise

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维普期刊数据库

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Coordination Effect-Promoted Durable Ni(OH)_(2) for Energy-Saving Hydrogen Evolution from Water/ Methanol Co-Electrocatalysis

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Nano-Micro Letters 2022年第12期14卷 176-194页

作者： Guodong Fu Xiaomin Kang Yan Zhang Xiaoqiang Yang Lei Wang Xian-Zhu Fu Jiujun Zhang Jing-Li Luo Jianwen Liu shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China School of Mechanical Engineering University of South ChinaHengyang 421001Hunan ProvincePeople’s Republic of China Institute for Sustainable Energy College of SciencesShanghai UniversityShanghai 200444People’s Republic of China

Electrocatalytic water splitting is a viable technique for generating hydrogen but is precluded from the sluggish kinetics of oxygen evolution reactions(OER).Small molecule oxidation reactions with lower working potentials,such as methanol oxidation reactions,are good alternatives to OER with faster ***,the typically employed Ni-based electrocatalysts have poor activity and ***,a novel three-dimensional(3D)-networking Modoped Ni(OH)_(2) with ultralow Ni-Ni coordination is synthesized,which exhibits a high MOR activity of 100 mA cm^(−2) at 1.39 V,delivering 28 mV dec^(−1) for the Tafel ***,hydrogen evolution with value-added formate co-generation is boosted with a current density of more than 500 mA cm^(−2) at a cell voltage of 2.00 V for 50 h,showing excellent stability in an industrial alkaline concentration(6 M KOH).Mechanistic studies based on density functional the-ory and X-ray absorption spectroscopy showed that the improved performance is mainly attributed to the ultralow Ni-Ni coordination,3D-networking structures and Mo dopants,which improve the catalytic activity,increase the active site density and strengthen the Ni(OH)_(2)3D-networking structures,*** study paves a new way for designing electrocatalysts with enhanced activity and durability for industrial energy-saving hydrogen production.

关键词： Coordination effect Methanol selective oxidation NiMoO4 Formate Energy-saving hydrogen production

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