In-situ electrodeposited flower-like NiFeO H /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 NiFeOxHy and NiFeOxHy/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 NiFeOxHy surface areas and numerous exposed layered edges and edge defects. Reduced graphene oxide (rGO) has been introduced to fabricate NiFeOxHy/rGO composite film, further improving the conductivity and OER performance of the flower-like NiFeOxHy. The optimized NiFeOxHy/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.