Methanol Steam Mediated Corrosion Engineering Towards High-Entropy NiFe Layered Double Hydroxide for Ultra-Stable Oxygen Evolution

Rational design of viable routes to obtain efficient and stable oxygen evolution reaction (OER) electrocatalysts remains challenging, especially under industrial conditions. Here, we provide a solvent-steam assisted corrosion engineering strategy to directly fabricate high-entropy NiFe-LDH with spatially resolved structural order. Ammonium fluoride in methanol steam enables the formation of nanosheets while Fe 3+ effectively enhances their adhesion to the semi-sacrificial nickel-iron foam (NFF), thereby conjuring up a NiFe-LDH@NFF catalyst that exhibits remarkable adaptability to robust electrochemical activation yet with excellent stability. Comprehensive measurements reveal the in-situ formation of high-valance metal oxyhydroxide and the enhancement of adsorption-desorption process. Under the industrial condition (6mol/L KOH, 60 degrees C), the NiFe-LDH@NFF exhibits excellent activity of 50mA/cm2 at 1.55 V and high durability of over 120 h at 200 mA/cm2. We anticipate that the steam assisted strategy could promote the development of efficient non-precious electrocatalysts for hydrogen energy. (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.