Efficient and durable S-doped Ni/FeOOH electrocatalysts for oxygen evolution reactions

Abstract

It is important to develop highly efficient and durable Earth-abundant oxygen evolution reaction (OER) electrocatalysts by an energy- and time-saving strategy. Herein, a facile strategy was used to synthesize S-doped nickel–iron oxyhydroxide (S–Ni/FeOOH) nanoparticles on nickel–iron foam (NFF) (S–Ni/FeOOH@NFF), which exhibits a striking enhancement of OER performance compared to Ni/FeOOH@NFF. The free-standing S–Ni/FeOOH@NFF electrode possesses a low overpotential of 229 mV at a current density of 10 mA cm⁻², which is 180 mV lower than that of Ni/FeOOH@NFF. In addition, the electrode was also remarkably stable. The current density still remains at 95% after 150 h at a high current density of 100 mA cm⁻².