Developing stable and highly active electrocatalysts for the oxygen evolution reaction (OER) in acidic media holds significant importance for proton-exchange membrane water electrolysis. Here, we report a carbon-protected, low Ru-doped cobalt oxide nanosheet array electrode (C–Ru–Co₃O₄) for acid OER. The doping of Ru adjusts the electronic structure, optimizing the adsorption of reaction intermediates. Additionally, amorphous carbon, derived from polydopamine, effectively inhibits the overoxidation of Ru–Co₃O₄. Furthermore, the sheetlike structure and strong interplay between the catalyst and support promote mass and charge transfer while extending the long-term durability. Compared to Co₃O₄ and commercial RuO₂ catalysts, C–Ru–Co₃O₄ catalyst exhibits enhanced OER performance and stability. The optimized catalyst shows an overpotential of 252 mV at 10 mA cm^–2 and can operate continuously in acidic media for more than 30 h, while the activity of commercial RuO₂ sharply decreases within 1 h. Notably, C–Ru–Co₃O₄ also exhibits good hydrogen evolution reaction (HER) activity, with an overpotential of 125 mV at 10 mA cm^–2. Furthermore, the acid water splitting electrolyzer, based on bifunctional C–Ru–Co₃O₄, can be effectively driven by a solar panel, revealing its potential for converting solar energy into clean chemical energy.

中文翻译：

---

碳封装 Ru-Co3O4 纳米片作为酸性水氧化电催化剂


开发用于酸性介质中析氧反应（OER）的稳定且高活性的电催化剂对于质子交换膜水电解具有重要意义。在这里，我们报道了一种用于酸性 OER 的碳保护、低 Ru 掺杂氧化钴纳米片阵列电极 (C–Ru–Co ₃ O ₄ )。 Ru 的掺杂调整了电子结构，优化了反应中间体的吸附。此外，源自聚多巴胺的无定形碳可有效抑制 Ru–Co ₃ O ₄ 的过度氧化。此外，片状结构以及催化剂和载体之间的强相互作用促进了质量和电荷转移，同时延长了长期耐久性。与Co ₃ O ₄ 和商业RuO ₂ 催化剂相比，C–Ru–Co ₃ O ₄ 催化剂表现出增强的 OER 性能和稳定性。优化后的催化剂在10 mA cm ^–2 下表现出252 mV的过电势，可以在酸性介质中连续运行30 h以上，而商业RuO ₂ 的活性在1年内急剧下降。 H。值得注意的是，C–Ru–Co ₃ O ₄ 还表现出良好的析氢反应 (HER) 活性，在 10 mA cm 下的过电势为 125 mV ^–2 。此外，基于双功能C-Ru-Co ₃ O ₄ 的酸性水分解电解槽可以由太阳能电池板有效驱动，揭示了其将太阳能转化为清洁能源的潜力化学能源。