Developing highly efficient, cost-effective and extremely stable electrocatalysts toward oxygen evolution reaction (OER) is a great challenge for their promising water splitting application to promote the sluggish kinetics. In this work, an amorphous non-noble FeCoNi trimetallic aerogel (FeCoNi AG) is prepared via a one-step in situ spontaneous gelation and reduction strategy, presenting a remarkable OER activity and stability in an alkaline medium. FeCoNi AG catalyst delivers an exceptionally low overpotential of 235 mV at a current density of 10 mA cm⁻² and features a small Tafel slope of 50 mV dec^-1 in 1 M KOH, which is superior to the state-of-the-art RuO₂ and many other reported transition FeCoNi-based catalysts. In addition, an outstanding long-term durability during 40 h chronoamperometric test and 5000 cyclic voltammetry (CV) cycles without obvious degradation of current density is achieved. This work is of high inspiration for developing transition metals-based amorphous aerogel electrocatalysts for greatly enhanced oxygen evolution.

开发用于析氧反应（OER）的高效、经济且极其稳定的电催化剂是其有前途的水分解应用以促进缓慢动力学的巨大挑战。在这项工作中，通过一步原位自发凝胶和还原策略制备了无定形非贵重 FeCoNi 三金属气凝胶（FeCoNi AG），在碱性介质中表现出显着的 OER 活性和稳定性。FeCoNi AG 催化剂在 10 mA cm ^-2的电流密度下提供了 235 mV 的极低过电位，并且在 1 M KOH 中具有 50 mV dec ^-1的小塔菲尔斜率，优于最先进的催化剂RuO ₂和许多其他报道的过渡 FeCoNi 基催化剂。此外，在 40 小时计时电流测试和 5000 次循环伏安 (CV) 循环期间，实现了出色的长期耐久性，而电流密度没有明显降低。这项工作对开发基于过渡金属的无定形气凝胶电催化剂具有很大的启发性，以大大增强析氧能力。