Three-dimensional Fe3S4@NiS hollow nanospheres as efficient electrocatalysts for oxygen evolution reaction

Due to outstanding performance in energy conversion and storage, transition metal sulfides as well as hollow microstructure have become possible alternatives to noble metal electrocatalyst and become a hot issue. Therefore, we successfully synthesized Fe3S4@NiS hollow nanospheres (HSs) by a one-step solvothermal process, applied in oxygen evolution reactions (OER) to provide sustainable energy. Owing to particular microstructure and proper elemental composition ratio, Fe3S4@NiS HSs (partially been oxidized) show an outstanding OER performance with the overpotential and Tafel slope of only 338 mV at 10 mA cm−2 and 73 mV dec−1 in 0.1 M KOH solution, respectively.