In situ electrochemical dehydrogenation of ultrathin Co(OH)_(2) nanosheets for enhanced hydrogen evolution

作     者：Qian Zhou Qihang Bian Liling Liao Fang Yu Dongyang Li Dongsheng Tang Haiqing Zhou Qian Zhou;Qihang Bian;Liling Liao;Fang Yu;Dongyang Li;Dongsheng Tang;Haiqing Zhou

作者机构：Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsKey Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of EducationKey Laboratory for Matter Microstructure and Function of Hunan ProvinceHunan Normal UniversityChangsha 410081China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第1期

页      面：469-473页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：mainly funded by National Science Foundation of China(Nos.12074116 and 52172197) the Youth 1000 Talent Program of China,Undergraduate Scientific Research Innovation Project of China(No.202110542037) Science and Technology Innovation Platform(No.2019RS1032) Major Program of Natural Science Foundation of Hunan Province of Hunan Province,and Hunan Normal University(Nos.2021133,21CSZ004 and 21CSZ029) the support from Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy(No.2020CB1007) the support from Science and Technology Innovation Program of Hunan Province(No.2021RC2075) 

主　　题：Hydrogen evolution reaction Transition metal hydroxide In-situ electrochemical dehydrogenation In-plane heterostructure Water splitting 

摘      要：Transition metal hydroxides/oxyhydroxides have recently emerged as highly active electrocatalysts for oxygen evolution reaction in alkaline water electrolysis,while have not yet been widely investigated for hydrogen evolution electrocatalysts owing to their unfavorable H*-adsorption,making it difficult to construct an overall-water-splitting cell for hydrogen *** this work,we proposed a straightforward and effective approach to develop an efficient in-plane heterostructured CoOOH/Co(OH)_(2) catalyst via in-situ electrochemical dehydrogenation method,in which the dehydrogenated–CoOOH and Co(OH)_(2) at the surface synergistically boost the hydrogen evolution reaction(HER)kinetics in base as confirmed by high-resolution transmission electron microscope,synchrotron X-ray absorption spectroscopy,and electron energy loss *** to the in-situ dehydrogenation of ultrathin Co(OH)_(2) nanosheets,the catalytic activity of the CoOOH/Co(OH)_(2) heterostructures is progressively improved,which exhibit outstanding hydrogen-evolving activity in base requiring a low overpotential of 132 m V to afford 10 m A/cm^(2)with very fast reaction kinetics after 60 h *** gradually improved catalytic performance for the CoOOH/Co(OH)2is probably due to the enhanced H*-adsorption induced by the synergistic effect of heterostructures and better conductivity of Co OOH relative to electrically insulating Co(OH)_(2).This work will open the opportunity for a new family of transition metal hydroxides/oxyhydroxides as active HER catalysts,and also highlight the importance of using in situ techniques to construct precious metal-free efficient catalysts for alkaline hydrogen evolution.