Abstract In the pursuit of stable, high performance Ni-based oxygen evolution reaction (OER) electrocatalysts, modifying the local chemical compositions or fabricating hybrid nanostructures to generate abundant interfaces for improving the water oxidation activity of electrocatalysts has emerged as an effective strategy. Herein, we report the facile development of a Ni3S2-CeO2 hybrid nanostructure via an electrodeposition method. Benefiting from the strong interfacial interaction between Ni3S2 and CeO2, the electron transfer is notably improved and the water oxidation activity of Ni3S2 nanosheets is significantly enhanced. In 1.0 M KOH, the Ni3S2-CeO2 electrocatalyst achieves a current density of 20 mA cm–2 at a low overpotential of 264 mV, which is 92 mV lower than that of Ni3S2. Moreover, Ni3S2-CeO2 exhibits superior electrochemical stability. Density functional theory calculations demonstrate that the enhanced OER electrocatalytic performance of Ni3S2-CeO2 can be ascribed to an increase in the binding strength of the reaction intermediates at the Ni3S2-CeO2 interface.

中文翻译：

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通过在 Ni3S2 纳米片上装饰 CeO2 促进活性物种的高效水氧化电催化

摘要 在追求稳定、高性能的 Ni 基析氧反应 (OER) 电催化剂的过程中，改变局部化学成分或制造杂化纳米结构以产生丰富的界面以提高电催化剂的水氧化活性已成为一种有效的策略。在此，我们报告了通过电沉积方法轻松开发 Ni3S2-CeO2 混合纳米结构。受益于 Ni3S2 和 CeO2 之间强的界面相互作用，电子转移显着改善，Ni3S2 纳米片的水氧化活性显着增强。在 1.0 M KOH 中，Ni3S2-CeO2 电催化剂在 264 mV 的低过电位下实现了 20 mA cm-2 的电流密度，比 Ni3S2 低 92 mV。此外，Ni3S2-CeO2 表现出优异的电化学稳定性。