Highly Active and Durable FeNiCo Oxyhydroxide Oxygen Evolution Reaction Electrocatalysts Derived from Fluoride Precursors

Developing highly active and durable electrocatalysts, consisting of earth-abundant elements, for oxygen evolution reaction (OER) is pivotal large-scale water splitting hydrogen production. Herein, we report that the commercially available FeNiCo alloy can be converted to a electrocatalyst OER by galvanostatic anodizing in fluoride-containing ethylene glycol electrolyte. Anodizing develops porous film (FeNiCo)F2 phase, which readily oxyhydroxide during anodic polarization KOH The anodized exhibits high activity durability with an overpotential as low 0.26 V at current density 10 mA cm–2. present study demonstrates simple cost-effective process used form electrode from low-cost, practical, iron-based alloy. In addition, found fluorides containing Fe, Ni, Co are excellent precursors formation oxyhydroxides exhibiting durability.