Chinese Journal of Catalysis ›› 2023, Vol. 55: 182-190.DOI: 10.1016/S1872-2067(23)64554-1

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A Bi-doped RuO2 catalyst for efficient and durable acidic water oxidation

Liqing Wua, Qing Liangb, Jiayi Zhaoa, Juan Zhua, Hongnan Jiaa, Wei Zhangb,*(), Ping Caia,*(), Wei Luoa,*()   

  1. aCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, China
    bKey Laboratory of Automobile Materials MOE, and School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, and Electron Microscopy Center, and International Center of Future Science, Jilin University, Changchun 130012, Jilin, China
  • Received:2023-09-27 Accepted:2023-10-25 Online:2023-12-18 Published:2023-12-07
  • Contact: *E-mail: weizhang@jlu.edu.cn (W. Zhang), applecaiping@163.com (P. Cai), wluo@whu.edu.cn (W. Luo).
  • Supported by:
    National Natural Science Foundation of China(22272121);National Natural Science Foundation of China(21972107);National Natural Science Foundation of China(51872115)

Abstract:

Ruthenium oxide-based electrocatalysts have been regarded as promising alternatives to the state-of-the-art Iridium oxide (IrO2) towards acidic oxygen evolution reaction (OER). However, their practical applications of proton exchange membrane water electrolyzer (PEMWE) are severely limited by the lack of efficient strategy to balance the seesaw relation between stability and activity of ruthenium oxide (RuO2)-based catalysts. Herein, we report that both the activity and stability of RuO2 can be significantly boosted though bismuth (Bi) doping. We find that the introduction of Bi can increase the initial valance state of Ru in Bi0.15Ru0.85O2, which can promote the activation of Ru active sites, and facilitate the reaction kinetics of acidic OER. Besides, the presence of Bi can strengthen the electron interaction to maintain the structure stability and improve the electrocatalytic performance by reducing the energy barriers and avoiding the overoxidation of active species. The obtained Bi0.15Ru0.85O2 catalyst shows a low overpotential of 200.0 mV to reach a current density of 10 mA cm-2 under acidic media, and a long-term stability for over 100 hours. Our work provides an important inspiration to rational design RuO2-based electrocatalysts with high activity and durability toward acidic OER.

Key words: Oxygen evolution reaction, RuO2-based catalyst, Bismuth doping, Activity, Stability