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 introduc-ing 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 photo-electron spectroscopy(XPS),operando Raman and so forth,it is demonstrated that when the atomic con-tent 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 mecha-nism 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.

Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;Key Laboratory for Ultrafine Materials of Ministry of Education,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China

[1]Yuhan Zhao;Menghua Xi;Yanbin Qi;Xuedi Sheng;Pengfei Tian;Yihua Zhu;Xiaoling Yang;Chunzhong Li;Hongliang Jiang-.Redirecting dynamic structural evolution of nickel-contained RuO2 catalyst during electrochemical oxygen evolution reaction)[J].能源化学,2022(06):330-337

Redirecting,Ru4+to,Rux+,redirect,Ru4+oxidation

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