文献类型：期刊文献

英文题名：Redirecting dynamic structural evolution of nickel-contained RuO2 catalyst during electrochemical oxygen evolution reaction

作者：Zhao, Yuhan[1,2];Xi, Menghua[1];Qi, Yanbin[1];Sheng, Xuedi[2];Tian, Pengfei[3];Zhu, Yihua[1];Yang, Xiaoling[1];Li, Chunzhong[1,2];Jiang, Hongliang[2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：69

起止页码：330

外文期刊名：JOURNAL OF ENERGY CHEMISTRY

收录：;EI(收录号：20220911719810);WOS:【SCI-EXPANDED(收录号:WOS:000788228900007)】；

基金：Acknowledgments This work was supported by the National Natural Science Foun-dation of China (21978278, 21838003 and 91834301) , the Shang-hai Scientific and Technological Innovation Project (18JC1410500 and 19JC1410400) , and the Fundamental Research Funds for the Central Universities (222201718002) .

语种：英文

外文关键词：Oxygen evolution reaction; Ruthenium; Structure evolution; Electrocatalysis; Operando Raman

摘要：Electrochemical oxygen evolution reaction (OER) is a main efficiency bottleneck of water electrolysis. Commercial ruthenium oxide (RuO2) catalyst displays remarkable activities but poor stability for OER. The instability stems from lattice oxygen oxidation, resulting in the oxidation of Ru4+ to soluble Rux+ (x > 4) species. Herein, we redirect dynamic structural evolution of Ru-based catalysts through introducing oxidized nickel (Ni) components. By virtue of comprehensive structural characterizations, such as high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectroscopy (XPS), operando Raman and so forth, it is demonstrated that when the atomic content of Ni exceeds that of ruthenium (Ru), the Ni components can efficiently inhibit the Ru4+ oxidation and structural collapse. Density functional theory (DFT) calculations suggest that the introduction of Ni component hinders the formation of oxygen vacancies, and makes lattice oxygen mediated mechanism turn to adsorbate evolution mechanism, which eventually improves the stability. The optimized nickel-contained RuO2 catalyst delivers an effective reactivity with an overpotential of less than 215 mV to attain 10 mA cm(-2) and remarkable stability with only 5 mV increment after 5000 potential cycles. This work provides insights into the origin of dynamic structural evolution of transition-metal-modified RuO2 electrocatalysts. (C) 2022 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.