Heterophase junction engineering-induced Co spin-state modulation of CoSe_(2) for large-current hydrogen evolution reaction  

作　　者：Bao-Chai Xu Ya-Ping Miao Min-Qin Mao Dong-Lian Li Song Xie Wei-Hong Jin Shu Xiao Jing Wen Zaenab Abd-Allah Zhi-Tian Liu Xiang Peng Paul K.Chu 

机构地区：[1]Hubei Key Laboratory of Plasma Chemistry and Advanced Materials,School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China [2]School of Textile Science and Engineering,Xi'an Polytechnic University,Xi'an 710048,China [3]Institute of Advanced Wear and Corrosion Resistant and Functional Materials,Jinan University,Guangzhou 510632,China [4]Institute of Safety Science and Engineering,South China University of Technology,Guangzhou 510641,China [5]Department of Engineering,Manchester Metropolitan University,Manchester M156BH,UK [6]Department of Physics,Department of Materials Science and Engineering,and Department of Biomedical Engineering,City University of Hong Kong,Hong Kong 999077,China

出　　处：《Rare Metals》2024年第6期2660-2670,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52002294 and 52202111);the Key Research and Development Program of Hubei Province(No.2021BAA208);the Knowledge Innovation Program of Wuhan-Shuguang Project(No.2022010801020364);City University of Hong Kong Donation Research Grant(No.DON-RMG 9229021);City University of Hong Kong Donation Grant(No.9220061);City University of Hong Kong Strategic Research Grant(SRG)(No.7005505)。

摘　　要：Efficient electrocatalysts are vital to large-current hydrogen production in commercial water splitting for green energy generation.Herein,a novel heterophase engineering strategy is described to produce polymorphic CoSe_(2)electrocatalysts.The composition of the electrocatalysts consisting of both cubic CoSe_(2)(c-CoSe_(2))and orthorhombic CoSe_(2)(o-CoSe_(2))phases can be controlled precisely.Our results demonstrate that junction-induced spin-state modulation of Co atoms enhances the adsorption of intermediates and accelerates charge transfer resulting in superior large-current hydrogen evolution reaction(HER)properties.Specifically,the CoSe_(2)based heterophase catalyst with the optimal c-CoSe_(2)content requires an overpotential of merely 240 mV to achieve 1,000 mA·cm^(-2)as well as a Tafel slope of 50.4 mV·dec^(-1).Furthermore,the electrocatalyst can maintain a large current density of 1,500 mA·cm^(-2)for over 320 h without decay.The results reveal the advantages and potential of heterophase junction engineering pertaining to design and fabrication of low-cost transition metal catalysts for large-current water splitting.

关 键 词：Heterophase junction SPIN-STATE Hydrogen evolution reaction Large current electrochemical hydrogen production Water splitting 

分 类 号：TQ426[化学工程] TQ116.2