Bimetallic active site nuclear-shell heterostructure enables efficient dual-functional electrocatalysis in alkaline media  

作　　者：Yu Cheng Xi Zhou Qin-Min Pan Li-Fang Zhang Yu-Feng Cao Tao Qian 

机构地区：[1]School of Chemistry and Chemical Engineering,Nantong University,Nantong,226019,China [2]Institute of Chemical Industry of Forestry Products,Chinese Academy of Forestry,Key Lab.of Biomass Energy and Material,Nanjing,210000,China [3]School of Chemical and Environmental Engineering,College of Chemistry,Chemical Engineering and Material Science,Soochow University,Suzhou,215123,China [4]Department of Chemical Engineering,University of Waterloo,Waterloo,ON,N2L 3G1,Canada

出　　处：《Rare Metals》2023年第9期3024-3033,共10页稀有金属（英文版）

基　　金：financially supported by the National Science Foundation of China(Nos.52203314,52071226 and 51872193);the Natural Science Foundations of Jiangsu Province(No.BK20210847);Jiangsu Key Laboratory for Biomass Energy and Material(No.JSBEM-S-201805);the Natural Science Foundations of the Jiangsu Higher Education Institutions of China(No.21KJB430042)。

摘　　要：Hydrogen,as a green and clean next-generation fuel,is a key to achieving the goal of carbon neutrality.Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water splitting.Herein,a bimetallic active site catalyst,which possessed an edge-riched MoS_(2)nanoflakes array vertically growing on cubic CoS_(2),forming a nuclear-shell heterogeneous configuration,termed CSC-Mo S_(2)@Co S_(2).was reported The optimal CSC-Mo S_(2)@Co S_(2)-24 possessed good dualfunctional electrocatalytic activity(hydrogen evolution(HER),10 m A·cm^(-2)@241.5 m V and oxygen evolution(OER),10 m A·cm^(-2)@350 m V).Especially,CSC-Mo S_(2)@CoS_(2)-24 exhibited an extremely high mass activity for HER,and only required an overpotential of~550 m V when reaching a large current density of 1422 m A·mg^(-1),which was20.6-fold that of the bulk CoS_(2)(69 m A·mg^(-1)),as well as exhibiting stability of up to 100 h.The good electrocatalytic performance was attributed to the nuclear-shell heterostructure of Mo S_(2)@CoS_(2)hybrid could bring critical synergies,improving efficient mass transfer and electron transfer processes between Co S_(2)and Mo S_(2),which collaboratively promoted the electrocatalytic kinetics.It is foreseeable that the method proposed in this work will have guiding value for the preparation of dual-functional electrocatalysts with multi-interface heterostructures by assembling layered sulfides on cubic sulfides.

关 键 词：Dual-functional electrocatalysts Nuclearshell cubic heterostructure Edge-riched Bimetallic active site Strong interaction 

分 类 号：TQ116.2[化学工程—无机化工] TQ426