Simultaneously enriching active sites and enhancing intrinsic activity in a simple way is of great importance for the design of highly active electrocatalysts for the oxygen evolution reaction (OER), but it still faces challenges. Herein, g-C₃N₄ quantum dot decorated amorphous hollow CoFe bimetallic phosphate nanocubes (a-CoFePO_x@CNQD) are prepared as an efficient OER electrocatalyst by a simple in situ etching–phosphating process. Research shows that their unique hollow architecture and amorphous structure can help provide generous exposed active sites for OER, and the incorporation of g-C₃N₄ quantum dots can effectively adjust the electronic structure to improve the intrinsic activity. Therefore, a-CoFePO_x@CNQD exhibits excellent OER performance with a low overpotential (239 mV) at 10 mA cm⁻² and a small Tafel slope (58.4 mV dec⁻¹), surpassing the commercial RuO₂. Furthermore, a-CoFePO_x@CNQD as an electrode catalyst for a water electrolyzer and zinc–air battery also shows higher performance and stability than RuO₂ + Pt/C catalysts. This study provides a feasible strategy for preparing efficient and stable amorphous hollow heterostructure OER electrocatalysts.

中文翻译：

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用 g-C3N4 量子点装饰的非晶态 CoFePOx 空心纳米立方体，可在析氧反应中实现高效的电催化性能


以简单的方式同时富集活性和增强内禀活性对于设计用于析氧反应 （OER） 的高活性电催化剂非常重要，但它仍然面临挑战。在此，g-C₃N₄ 量子点装饰的非晶空心 CoFe 双金属磷酸盐纳米立方体 （a-CoFePO_x@CNQD） 通过简单的原位蚀刻-磷化工艺制备为高效的 OER 电催化剂。研究表明，它们独特的空心结构和非晶结构有助于为 OER 提供大量暴露的活性位点，而 g-C₃N₄ 量子点的加入可以有效调整电子结构以提高本征活性。因此，a-CoFePO_x@CNQD 表现出优异的 OER 性能，在 10 mA ^cm-2 时具有低过电位 （239 mV） 和小塔菲尔斜率 （58.4 mV ^dec-1），超过了商用 RuO₂。此外，a-CoFePO_x@CNQD 作为水电解槽和锌空气电池的电极催化剂也表现出比 RuO₂ + Pt/C 催化剂更高的性能和稳定性。本研究为制备高效稳定的非晶空心异质结构 OER 电催化剂提供了一种可行的策略。