Hydrothermal Synthesized Co-Ni₃S₂ Ultrathin Nanosheets for Efficient and Enhanced Overall Water Splitting

Abstract

We used the one-step hydrothermal controlled synthesis method for Co-Ni₃S₂ ultrathin nanosheets grown directly on nickel foam(NF). The as-synthesized Co-Ni₃S₂/NF showed enhanced activities in the hydrogen evolution reaction(HER), oxygen evolution reaction(OER) and better overall water splitting(OWS) efficiency than the un-doped Ni₃S₂/NF. The voltage of Co-Ni₃S₂/NF for OWS was only 1.58 V at the current density of 10 mA/cm² and with long time(>30 h) current output during the current-density(i-t) test. The good i-t performance was also observed in both HER and OER processes. Additionally, the Co-Ni₃S₂/NF showed a large current density(>1 A/cm²) for both HER and OER. When the current densities reached 100 and 1000 mA/cm², the required overpotentials for Co-Ni₃S₂/NF were 0.35 and 0.75 V for OER and 0.30 and 0.85 V for HER. Therefore, after introducing Co, th e activity of Ni₃S₂-based material was strongly enhanced.

Keywords

Co-Ni₃S₂/nickel foam(NF) / Ultrathin nanosheet / Water splitting / Hydrogen evolution reaction / Oxygen evolution reaction

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