Iron-nickel-based electrocatalysts are a group of noble-metal-free and high-performance candidate for oxygen evolution reaction (OER), and autoxidation always occurs in their OER process. Autoxidation is a double-edged sword: it could in-situ generate high-catalytic activity sites to accelerate OER, but it also results in the attenuation of conductivity and the dissolution of active components. In this work, we propose a new strategy to relieve the negative impacts of autoxidation on OER through designing three-dimensional (3D) iron-nickel sulfide nanosheets/reduced graphene oxide (FeNiS₂ NS/rGO) nanohybrids via a one-pot colloidal method, which enabled the well dispersion and strong coupling of FeNiS₂ NS on the rGO. Such an interconnected 3D architecture could facilitate excellent electron transport, provide large amounts of active sites and prevent the dissolution of active components. The FeNiS₂ NS/rGO delivered extremely low overpotentials of 270 mV and 200 mV to reach a current density of 10 mA cm⁻², and rapid kinetics with Tafe slope of 38 mV dec⁻¹ and 40 mV dec⁻¹ for OER in 0.1 and 1.0 M KOH, respectively. Moreover, they could retain a great stability without activity loss over long-term continuous electrolysis and long-ageing time under air conditions. This work provides an efficient approach to resolve the autoxidation problem of FeNiS₂ NS in the OER process and develops a promising earth-abundant OER electrocatalyst towards practical applications.

铁镍基电催化剂是一组不含贵金属的高性能氧气释放反应（OER）候选物，并且自氧化总是发生在其OER过程中。自氧化是一把双刃剑：它可以在原位产生高催化活性的部位来加速OER，但也会导致电导率降低和活性成分溶解。在这项工作中，我们提出了一种新的策略，通过一锅式胶体方法设计三维（3D）铁-镍硫化物纳米片/氧化石墨烯（FeNiS ₂ NS / rGO ）纳米杂化物，减轻了自氧化对OER的不利影响。，可以实现FeNiS ₂的良好分散和强耦合NS在rGO上。这种互连的3D架构可以促进出色的电子传输，提供大量的活性位点并防止活性成分的溶解。FeNiS ₂ NS / rGO的超低电势分别为270 mV和200 mV，以达到10 mA cm ^-2的电流密度，并且在0.1的OER中Tafe斜率为38 mV dec ^-1和40 mV dec ^-1的快速动力学和1.0 M KOH分别。而且，它们可以在空气中长期连续电解和长时间老化的情况下保持良好的稳定性而不会损失活性。这项工作为解决FeNiS ₂的自氧化问题提供了一种有效的方法。 NS在OER过程中发展，并有望在实际应用中开发出前景广阔的OER电催化剂。