Tremella-like manganese dioxide complex (Fe,Ni)_3S_4 hybrid catalyst for highly efficient oxygen evolution reaction

摘要

Exploring high-efficiency and low-cost electrocatalysts with outstanding durableness for oxygen evolution reaction (OER) is the key to practical production of eco-friendly hydrogen energy by water electrolysis technology, which remains challenging. In this paper, the tremella-like MnO2/(Fe,Ni)(3)S-4 hybrid nanostructures are supported on nickel foam matrix by a facile and governable method, with predominant OER properties in 1.0 M KOH solution. Profiting from the synergistic effect between MnO2 and (Fe,Ni)(3)S-4, this optimal MnO2/(Fe,Ni)(3)S-4 catalyst only requires 220 and 325 mV to fulfill current densities of 10 and 500 mA cm(-2), respectively. Through the inheritance and optimization of MnO2 and (Fe,Ni)(3)S-4 nanostructures, this hybrid catalyst possesses a large specific surface area, appropriate exposure active site and favorable electrical conductivity. Besides, the selfsupported MnO2/(Fe,Ni)(3)S-4 electrode exhibits eminent stability at 10 and 100 mA cm(-2) during the 20 h OER process.