In-situ electrodeposited flower-like NiFeO_xH_y/rGO on nickel foam for oxygen evolution reaction

Developing cost-effective electrocatalysts for oxygen evolution reaction (OER) in basic media is critical to hydrogen production from renewable energy. Herein, in-situ electrodeposited flower-like NiFeO_xH_y and NiFeO_xH_y/rGO composite electrocatalysts on Ni foam for OER are reported. The active sites of the flower-like electrocatalysts are increased significantly due to the enhanced NiFeO_xH_y surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeO_xH_y/rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeO_xH_y. The optimized NiFeO_xH_y/rGO exhibits superior OER performance with a Tafel slope of 29.11 mV/decade, an overpotential of 200 mV at 10 mA/cm² in 1 mol/L KOH and favorable long-term stability.