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Frontiers of Optoelectronics

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Front. Optoelectron.    2022, Vol. 15 Issue (1) : 8    https://doi.org/10.1007/s12200-022-00014-7
RESEARCH ARTICLE
Hydrothermal synthesized delafossite CuGaO2 as an electrocatalyst for water oxidation
Han Gao1,2, Miao Yang1, Xing Liu1, Xianglong Dai1, Xiao-Qing Bao3, Dehua Xiong1,2()
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
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Abstract

Hydrogen production from water splitting provides an effective method to alleviate the ever-growing global energy crisis. In this work, delafossite CuGaO2 (CGO) crystal was synthesized through hydrothermal routes with Cu(NO3)2·3H2O and Ga(NO3)3·xH2O used as reactants. The addition of cetyltrimethylammonium bromide (CTAB) was found to play an important role in modifying the morphology of CuGaO2 (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 1–2 µm and a thickness 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/cm2. 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 introduction of CTAB was found to help to improve their electrocatalytic activity for OER.
Keywords Hydrothermal      Water splitting      Delafossite      CuGaO2 (CGO)      Electrocatalyst     
Corresponding Author(s): Dehua Xiong   
Issue Date: 06 May 2022
 Cite this article:   
Han Gao,Miao Yang,Xing Liu, et al. Hydrothermal synthesized delafossite CuGaO2 as an electrocatalyst for water oxidation[J]. Front. Optoelectron., 2022, 15(1): 8.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-022-00014-7
https://academic.hep.com.cn/foe/EN/Y2022/V15/I1/8
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