Developing earth‐abundant, highly active and long‐term durable electrocatalysts for oxygen evolution reaction (OER) is highly desirable and great challenging for large‐scale industrial application of electrochemical water splitting. Herein, in‐situ growth of uniform nanosheet arrays on nickel foam (NF) is hydrothermally achieved by varying feed ratios of Fe^III and Ni^II salts. The feed ratio of the two active metals has significantly dominated both the morphological and electronic structures of the resultant electrocatalysts, leading to feed ratio‐dependent volcano‐type OER activity. The optimized Fe_0.89Ni_0.11‐BDC/NF exhibits the best OER performance, affording a low overpotential of 220 mV to drive a current density of 50 mA·cm^–2 with small Tafel slope of 44.8 mV·dec^–1 and long‐lasting stability over 20 hours. The synergistic effect from the Fe^III and Ni^II species on both the morphological and electronic structure modulations have dramatically accelerated the reaction kinetics, responsible eventually for the enhanced OER activity. This work provides valuable information for nanostructured MOFs as efficient electrocatalysts.

中文翻译：

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自支撑金属有机骨架纳米片阵列电催化剂中杂金属进料比支配的放氧活性

对于氧分解反应的大规模工业应用，开发富氧，高活性和长期耐用的用于氧释放反应（OER）的电催化剂是非常需要的，并且是巨大的挑战。在本文中，通过改变Fe ^III和Ni ^II盐的进料比例，水热实现了在泡沫镍（NF）上均匀纳米片阵列的原位生长。两种活性金属的进料比已显着支配了所得电催化剂的形态和电子结构，从而导致了进料比依赖性的火山型OER活性。经过优化的Fe _0.89 Ni _0.11- BDC / NF具有最佳的OER性能，可提供220 mV的低过电位来驱动50 mA的电流密度· cm ^–2，Tafel斜率小，为44.8 mV · dec ^–1，在20小时内具有长期稳定性。Fe ^III和Ni ^II物种对形态和电子结构调节的协同作用极大地加快了反应动力学，最终导致增强的OER活性。这项工作为纳米结构MOF作为有效的电催化剂提供了有价值的信息。