Enhancing Industrial Oxygen Evolution Reaction Activity and Corrosion Resistance through Multielement Synergy of FeCoNiOx-MOF

Metal-organic framework (MOF) materials have been widely used for water electrolysis with their high-quality structural features and many active sites, while the corrosion resistance of the industrial oxygen evolution reaction (OER) anode is a significant challenge in water electrolysis for hydrogen production. We prepared a series of MOF materials (FeOx-MOF, CoOx-MOF, NiOx-MOF, FeNiOx-MOF, FeCoOx-MOF, CoNiOx-MOF, and FeCoNiOx-MOF) by doping transition metals Fe, Co, and Ni as polymetallic elements. As an OER catalyst, FeCoNiOx-MOF exhibits the best electrocatalytic activity with an overpotential of 290 mV at 10 mA cm^-2 current density among all the materials. It exhibits superior catalytic activity compared to RuO₂. In addition, the current density and stability of FeCoNiOx-MOF are superior to those of CoNiOx-MOF and CoOx-MOF under the same constant potential (1.57 V vs RHE) conditions. Within 48 h, the corrosion current density change of FeCoNiOx-MOF (15.0%) was significantly lower than that of industrial-grade nickel foam (30.0%) in the same group, indicating a significant improvement in corrosion resistance, which may be attributed to the synergistic effect of multiple elements in FeCoNiOx-MOF. This study prepared a multielement FeCoNiOx-MOF with enhanced OER activity and corrosion resistance, providing a partial theoretical basis for its industrial applications.