Self-supported Ni2P nanoarrays as efficient electrocatalysts for oxygen evolution reaction and hydrogen evolution reaction

Developing bifunctional electrocatalysts with good stability and high electroactivity is of vital importance for overall water splitting. Herein, three-dimensional self-supporting Ni2P nanosheet arrays on stainless steel mesh (Ni2P/SSM) electrocatalysts were synthesized and evaluated for both oxygen evolution reactions (OER) and hydrogen evolution reactions (HER). The Ni2P/SSM exhibited excellent OER performance in alkaline media with only an overpotential of 0.35 V to drive a current density of 100 mA cm−2. In addition, the Ni2P/SSM electrodes delivered a current density of 10 mA cm−2 for HER at the overpotential of 0.12 V.