Electrodeposition of nanoporous Ni0.85Se arrays anchored on rGO promotes high-efficiency oxygen evolution reaction

Highly efficient and low-cost electrocatalyst is much desirable for oxygen evolution reaction (OER) to enhance the water splitting efficiency. In this work, a self-supported nanoporous Ni 0.85 Se/rGO was electrodeposited on NF and used as OER catalyst. The synthesized Ni 0.85 Se/rGO exhibits a low overpotential of 280 mV to afford 100 mA cm −2 , a small Tafel slope of 40.2 mV dec −1 , and a high stability with nearly negligible potential fluctuation at a large current density of 100 mA cm −2 during 24-h long-term test, which is at the top level among recently reported OER electrocatalyst. The mechanism reason for the outstanding stability of Ni 0.85 Se/rGO was revealed. It is mainly attributed to its well-maintained nanoporous structure, larger ECSA, high electrical conductivity, and most importantly its superaerophobic surface.