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 

机构地区：[1]Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications,Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Key Laboratory for Matter Microstructure and Function of Hunan Province,Hunan Normal University,Changsha 410081,China [2]Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan University,Changsha 410082,China

出　　处：《Chinese Chemical Letters》2023年第1期469-473,共5页中国化学快报（英文版）

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)。

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 production.In 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 spectroscopy.Due 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 dehydrogenation.The 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.

关 键 词：Hydrogen evolution reaction Transition metal hydroxide In-situ electrochemical dehydrogenation In-plane heterostructure Water splitting 

分 类 号：TB33[一般工业技术—材料科学与工程]