To overcome the limited potency of energy devices such as alkaline water electrolyzers, the construction of active materials with dramatically enhanced oxygen evolution reaction (OER) performance is of great importance. Herein we developed an ion diffusion-induced doping strategy that is capable of producing Ni²⁺/Co²⁺ doped two-dimensional (2D) Au-Fe₇S₈ nanoplatelets (NPLs) with exceptionally high OER activity outperforming the benchmark RuO₂ catalyst. The co-existence of Co and Ni in Au-Fe₇S₈ NPLs led to the lowest OER overpotential of 243 mV at 10 mA cm^-2 and fast kinetics with a Tafel slope of 43 mV dec^-1. Density functional theory (DFT) calculations demonstrated that Ni²⁺/Co²⁺ doping improves the binding of OOH species on the {001} surfaces of Au-Fe₇S₈ NPLs and lowers the Gibbs free energy of the OER process, which are beneficial to outstanding OER activity of the nanoplatelets.

为了克服碱性水电解槽等能源设备的有限效力，构建具有显着增强的析氧反应（OER）性能的活性材料非常重要。在此，我们开发了一种离子扩散诱导掺杂策略，该策略能够产生 Ni ²⁺ /Co ²⁺掺杂的二维（2D）Au-Fe ₇ S ₈纳米片（NPL），其 OER 活性非常高，优于基准 RuO ₂催化剂. Co 和 Ni 在 Au-Fe ₇ S ₈ NPL 中的共存导致在 10 mA cm ^{-2 时}的最低 OER 过电位为 243 mV，并且具有 43 mV dec ^-1的 Tafel 斜率的快速动力学. 密度泛函理论 (DFT) 计算表明，Ni ²⁺ /Co ²⁺掺杂改善了 OOH 物质在 Au-Fe ₇ S ₈ NPL的 {001} 表面上的结合并降低了 OER 过程的吉布斯自由能，这是有利于纳米血小板出色的 OER 活性。