Hierarchical Porous Fe3O4/Co3S4 Nanosheets as Efficient Electrocatalysts for Oxygen Evolution Reaction
Transition-metal sulfides have attracted extensive interest as oxygen evolution reaction (OER) catalyst alternatives to noble metal based catalysts but generally exhibit limited electrocatalytic activity. We here report hierarchical porous Fe3O4/Co3S4 composite nanosheets for highly efficient electrocatalytic OER in alkaline electrolyte. The preparation of the composite involves a hydrothermal syntheses and subsequent sulfurization process. The prepared porous Fe3O4/Co3S4 composites show strong synergetic coupling effects, facilitated active sites exposure, and facile charge transfer. Remarkably, Fe3O4/Co3S4 nanosheets afforded electrocatalytic OER with a current density of 10 mA cm−2 at a low potential of 1.50 V and a small Tafel slope of about 56 mV/dec. This indicates that the composite of porous Fe3O4/Co3S4 nanosheets is promising as an efficient electrocatalyst of OER that can be used in the fields of fuel cells, metal-air batteries and water splitting for hydrogen production.