Controlled synthesis of Fe-Ni-S@CoSe2 on nickel foam as an efficient electrocatalyst for oxygen evolution reaction

Serious environmental pollution caused by fossil fuel consumption and urgent energy demand caused by human social development have forced mankind to develop green and reusable energy. Hydrogen energy has received significant attention and because of its eco-friendly, pure and carbon-free. In this paper, OER electrocatalyst Fe-Ni-S@CoSe2/NF covered by nanoparticles Fe-Ni-S (Fe4.005Ni4.995S8) on CoSe2 ultra-thin nanosheets was prepared with a two-step electrodeposition taking nickel foam (NF) into account as the substrate. On the basis of maintaining the CoSe2 electrocatalytic performance, the participation of Fe-Ni-S has greatly improved the OER and water electrolysis performance of Fe-Ni-S@CoSe2/NF composite. Electrochemical assay revealed that Fe-Ni-S@CoSe2/NF-700 possessed superb OER activity for 1 M KOH solution. The overpotential was 180 mV at 10 mA cm−2. In addition, overpotential showed no obvious variation over 20 h stability test, indicating remarkable overall water electrolysis performance and excellent term resistance of electrocatalyst. This work gives constructive ideas for the preparation of cost-effective green water electrolysis catalyst.