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<p>Ruthenium dioxide has attracted extensive attention as a promising catalyst for oxygen evolution reaction in acid. However, the over-oxidation of RuO<sub>2</sub> into soluble H<sub>2</sub>RuO<sub>5</sub> species results in a poor durability, which hinders the practical application of RuO<sub>2</sub> in proton exchange membrane water electrolysis. Here, we report a confinement strategy by enriching a high local concentration of in-situ formed H<sub>2</sub>RuO<sub>5</sub> species, which can effectively suppress the RuO<sub>2</sub> degradation by shifting the redox equilibrium away from the RuO<sub>2</sub> over-oxidation, greatly boosting its durability during acidic oxygen evolution. Therefore, the confined RuO<sub>2</sub> catalyst can continuously operate at 10 mA cm<sup>–2</sup> for over 400 h with negligible attenuation, and has a 14.8 times higher stability number than the unconfined RuO<sub>2</sub> catalyst. An electrolyzer cell using the confined RuO<sub>2</sub> catalyst as anode displays a notable durability of 300 h at 500 mA cm<sup>–2</sup> and at 60 °C. This work demonstrates a promising design strategy for durable oxygen evolution reaction&#xa0;catalysts in acid via confinement engineering.</p>

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Boosting the durability of RuO2 via confinement effect for proton exchange membrane water electrolyzer

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年1月2日

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  • Wen-Xing Zheng,
  • Xuan-Xuan Cheng,
  • Ping-Ping Chen,
  • Lin-Lin Wang,
  • Ying Duan,
  • Guo-Jin Feng,
  • Xiao-Ran Wang,
  • Jing-Jing Li,
  • Chao Zhang,
  • Zi-You Yu,
  • Tong-Bu Lu

摘要

Ruthenium dioxide has attracted extensive attention as a promising catalyst for oxygen evolution reaction in acid. However, the over-oxidation of RuO2 into soluble H2RuO5 species results in a poor durability, which hinders the practical application of RuO2 in proton exchange membrane water electrolysis. Here, we report a confinement strategy by enriching a high local concentration of in-situ formed H2RuO5 species, which can effectively suppress the RuO2 degradation by shifting the redox equilibrium away from the RuO2 over-oxidation, greatly boosting its durability during acidic oxygen evolution. Therefore, the confined RuO2 catalyst can continuously operate at 10 mA cm–2 for over 400 h with negligible attenuation, and has a 14.8 times higher stability number than the unconfined RuO2 catalyst. An electrolyzer cell using the confined RuO2 catalyst as anode displays a notable durability of 300 h at 500 mA cm–2 and at 60 °C. This work demonstrates a promising design strategy for durable oxygen evolution reaction catalysts in acid via confinement engineering.