Molybdate-Mediated Self-Healing NiMoFeO/Ni Electrodes for Durable Alkaline OER

Abstract

Dynamic molybdate chemistry sustains reconstructed NiFeOOH during alkaline oxygen evolution. In self-healing NiMoFeO/Ni electrodes, reversible MoO42- leaching/redeposition helps restore Ni3+-rich active species and facilitates charge transfer, enabling an overpotential of 221 mV at 10 mA cm-2 and durable operation at 500 mA cm-2 for 300 h.