Designing hierarchical electrocatalysts with superior water oxidation performance is highly desirable for the production of renewable chemical fuels. Here, we report the development of a CuO@CoFe layered double hydroxide core–shell heterostructure supported on Cu foil (CuO@CoFe-LDH/CF) as a highly active catalyst electrode for water oxidation under mild alkaline conditions. In a 0.2 M carbonate buffer solution (pH 11), it only needs a small overpotential of 213 mV to achieve 10 mA cm^–2, outperforming all reported electrocatalysts at comparable testing conditions. It also shows outstanding long-term durability.

中文翻译：

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CuO @ CoFe层状双氢氧化物核-壳异质结构作为轻度碱性条件下的高效水氧化电催化剂。

设计具有优异水氧化性能的分级电催化剂是生产可再生化学燃料的高度期望。在这里，我们报道了在铜箔上支撑的CuO @ CoFe层状双氢氧化物核-壳异质结构的发展（CuO @ CoFe-LDH / CF），作为在弱碱性条件下用于水氧化的高活性催化剂电极。在0.2 M碳酸盐缓冲溶液（pH 11）中，仅需一个213 mV的小过电位即可达到10 mA cm ^–2，在可比较的测试条件下胜过所有报道的电催化剂。它还具有出色的长期耐用性。