NiFe-based hydroxides are considered as promising nonprecious catalysts for water oxidation due to their low cost and easy preparation. However, the rational design of NiFe-based electrocatalysts remains a great challenge to address the sluggish reaction kinetics and severe deactivation problems for oxygen evolution reaction (OER). Here, the authors report a facile approach to fabricate an amorphous Ce-doped NiFe hydroxide catalyst, which enables high activity and outstanding stability toward OER in alkaline media. The overpotential of electrodeposited amorphous Ce-doped NiFe is only 195 mV at 10 mA cm⁻². Meanwhile, the durability of the amorphous Ce-doped NiFe is maintained for 300 h at 100 mA cm⁻². The comprehensive characterization results reveal that the improved electrochemical performance of the amorphous Ce-doped NiFe catalyst is originated from the favorable oxidation transition of active sites enabled by Ce-doping. It is a very good strategy to introduce highly oxidized state ions to regulate the NiFe-based catalyst to improve the catalytic activity and stability.

中文翻译：

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电沉积无定形 Ce 掺杂 NiFe 基催化剂用于电化学水氧化的活性和稳定性的提高

NiFe基氢氧化物因其低成本和易于制备而被认为是有前途的非贵金属水氧化催化剂。然而，NiFe基电催化剂的合理设计仍然是解决氧析出反应（OER）反应动力学缓慢和严重失活问题的巨大挑战。在这里，作者报告了一种制造无定形 Ce 掺杂的 NiFe 氢氧化物催化剂的简便方法，该催化剂在碱性介质中对 OER 具有高活性和出色的稳定性。^{在 10 mA cm -2}电沉积非晶 Ce 掺杂 NiFe 的过电位仅为 195 mV 。^{同时，非晶Ce掺杂NiFe的耐久性在100 mA cm -2}下保持300 h. 综合表征结果表明，非晶 Ce 掺杂 NiFe 催化剂的电化学性能改善源于 Ce 掺杂使活性位点的有利氧化转变。引入高度氧化态离子来调节NiFe基催化剂以提高催化活性和稳定性是一种非常好的策略。