Ni3S2 nanostrips@FeNi-NiFe2O4 nanoparticles embedded in N-doped carbon microsphere: An improved electrocatalyst for oxygen evolution reaction

•Ni3S2 nanostrips@FeNi-NiFe2O4nanoparticles embedded in N-doped carbon microspheres (Ni3S2@FeNi-NiFe2O4/C) were synthesized using a facile heat-treatment method.•Ni3S2@FeNi-NiFe2O4/C catalyst displays improved OER performance.•The outstanding OER performance is mainly attributed due to the synergetic effect between FeNi-NiFe2O4nanoparticles and Ni3S2nanostrips.