Hydrothermal synthesized delafossite CuGaO_(2) as an electrocatalyst for water oxidation  

作　　者：Han Gao Miao Yang Xing Liu Xianglong Dai Xiao-Qing Bao Dehua Xiong 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [3]State Key Laboratory of Optical Technologies on Nanofabrication and Microengineering,Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China

出　　处：《Frontiers of Optoelectronics》2022年第1期80-91,共12页光电子前沿（英文版）

基　　金：The authors would like to express their sincere thanks for the financial support provided by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF018);the Fundamental Research Funds for the Central Universities(WUT:2020III012JL);X.Liu acknowledges the National Innovation and Entrepreneurship Training Program for College Students in WUT(No.S202110497022)。

摘　　要：Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy crisis.In this work,delafossite CuGaO_(2)(CGO)crystal was synthesized through hydrothermal routes with Cu(NO_(3))_(2)·3H_(2)O and Ga(NO_(3))_(3)·xH_(2)O used as reactants.The addition of cetyltrimethylammonium bromide(CTAB)was found to play an important role in modifying the morphology of CuGaO_(2)(CGO-CTAB).With the addition of CTAB,the morphology of CGO-CTAB samples changed from irregular flake to typical hexagonal sheet microstructure,with an average size of 1-2μm and a thick-ness of around 100 nm.Furthermore,the electrocatalytic activity of CGO-CTAB crystals for oxygen evolution reaction(OER)was also studied and compared with that of CGO crystals.CGO-CTAB samples exhibited better activity than CGO.An overpotential of 391.5 mV was shown to be able to generate a current density of 10 mA/cm^(2).The as-prepared samples also demonstrate good stability for water oxidation and relatively fast OER kinetics with a Tafel slope of 56.4 mV/dec.This work highlights the significant role of modification of CTAB surfactants in preparing CGO related crystals,and the introduc-tion of CTAB was found to help to improve their electrocatalytic activity for OER.

关 键 词：HYDROTHERMAL Water splitting DELAFOSSITE CuGaO_(2)(CGO) ELECTROCATALYST 

分 类 号：O64[理学—物理化学]