Ni₃Fe/Ni₄S₃/Ni/C Mixed Crystal Composite Nanofibers Prepared by Electrospinning and Heat Treatment Methods for Oxygen Evolution Reaction

Abstract

OER catalyst of Ni₃Fe/Ni₄S₃/Ni/C (NiFeSC series) mixed crystal composite nanofibers was prepared by electrospinning and atmospheric heat treatment process. The testing results indicate that the diameters of Ni₃Fe/Ni₄S₃/Ni/C composite nanofibers is about 200 nm, the grains size is about 1–3 nm, and the fiber surface is rough. The electrochemical test results show that the heterojunction of the prepared Ni₃Fe/Ni₄S₃/Ni/C hybrid crystal composite nanofiber has synergistic effect with sulfide, and exhibits good electrocatalytic activity of water decomposition and OER in alkaline system. The OER electrocatalytic performance of Ni₃Fe/Ni₄S₃/Ni/C composite electrode prepared via a heat treatment at 1 000 °C process was tested in 1 mol/L KOH electrolytes. The results show that the overpotential is about 298 mV, the Tafel slope is about 74 mV·dec⁻¹, and the surface resistance is about 1.69 Ω·cm², at the current density of 10 mA·cm⁻².

Keywords

mixed crystal / composite material / nanofiber / NiFeSC / oxygen evolution reaction(OER)