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RuO2 clusters derived from bulk SrRuO3: Robust catalyst for oxygen evolution reaction in acid

Muwei Ji1,2,§, Xin Yang3,§, Shengding Chang3,§, Wenxing Chen4,§, Jin Wang1,3,§ (✉), Dongsheng He5, Yao Hu3, Qian Deng3, You Sun3, Bo Li3, Jingyu Xi3, Tomoaki Yamada6, Jiatao Zhang4, Hai Xiao7, Caizhen Zhu2, Jia Li3 (✉), and Yadong Li7 (✉)

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1 College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
2 Institute of Low-Dimensional Materials Genome Initiative, College of Chemistry and Environmental Engineering of Shenzhen University, Shenzhen 518060, China
3 Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
4 Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
5 Materials Characterization and Preparation Center, Southern University of Science and Technology, Shenzhen 518055, China
6 Department of Energy Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
7 Department of Chemistry, Tsinghua University, Beijing 100084, China
§ Muwei Ji, Xin Yang, Shengding Chang, Wenxing Chen, and Jin Wang contributed equally to this work.

Keywords: oxygen evolution reaction, RuO2 cluster, electrochemical leaching, acid solution
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Developing highly efficient oxygen evolution reaction (OER) catalyst for the acidic corrosive operating conditions is a challenging task. Herein, we report the synthesis of uniform RuO2 clusters with ~ 2 nm in size via electrochemical leaching of Sr from SrRuO3 ceramic in acid. The RuO2 clusters exhibit ultrahigh OER activity with overpotential of ~ 160 mV at 10 mA·cmgeo−2 in 1.0 M HClO4 solution for 30-h testing. The extended X-ray absorption fine structure measurement reveals enlarged Jahn-Teller distortion of RuO octahedra in the RuO2 clusters compared to its bulk counterpart. Density function theory calculations show that the enhanced Jahn-Teller distortion can improve the intrinsic OER activity of RuO2.
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RuO2 clusters derived from bulk SrRuO3: Robust catalyst for oxygen evolution reaction in acid. Nano Res.

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