The development of efficient and low‐cost oxygen evolution reaction (OER) catalysts is essential for the generation of clean hydrogen energy from water splitting. Herein, a novel hierarchical urchin‐like cobalt‐copper (hydr)oxide in situ grown on copper foam (CoCuO_x H_y (S)/CF) was synthesized through the electrochemical transformation of cobalt‐copper sulfides (Co₉S₈‐Cu_1.81S) via anodization process. This CoCuO_x H_y (S)/CF anode exhibited a low overpotential (η ) of 274 mV at a current density of 100 mA cm⁻² with a robust durability over a period of 40 h when operated at 10 mA cm⁻². Further investigations imply that the unique nanowires aggregated urchin‐like structure of CoCuO_x H_y (S) derived from the in situ anion exchange process could facilitate the exposure of active sites and accelerate electron transfer. More importantly, the incorporation of copper resulted in an electronic delocalization around the cobalt species, which contributed to reach a high‐valent catalytically active cobalt species and further improved the OER performance.

中文翻译：

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像Urchin一样的钴-铜（Hydr）氧化物可作为高效的水氧化电催化剂。

开发高效低成本的氧气析出反应（OER）催化剂对于从水分解中产生干净的氢能至关重要。在此，通过钴-铜硫化物（Co ₉ S ₈ -Cu ）的电化学转化，合成了一种新型的在铜泡沫上原位生长的类似海胆状的钴-铜（氢）氧化物（CoCuO _x H _y（S）/ CF）。_1.81 S）通过阳极氧化工艺。该CoCuO _x H _y（S）/ CF阳极在100 mA cm ^-2的电流密度下表现出274 mV的低过电势（η），并且在10 mA cm ^{-2的条件下}在40 h内具有很强的耐久性。进一步的研究表明，独特的纳米线聚集了原位阴离子交换过程产生的CoCuO _x H _y（S）的顽童状结构，可以促进活性位点的暴露并加速电子转移。更重要的是，铜的掺入导致钴物种周围的电子离域，这有助于达到高价催化活性钴物种，并进一步提高了OER性能。