Porous NiCu Nanoarrays Decorated by Hydr(oxy)oxides As Highly Active Catalyst for Hydrogen Evolution Reaction

The design of non-precious metals catalyst as electrode for efficient hydrogen evolution reaction (HER) is in crucial demand. A porous NiCu/hydr(oxy)oxides nanoarrays electrode ( p -NiCu(O x H y )) was prepared with electrochemical dealloying followed by anodization method. The p -NiCu(O x H y ) exhibits excellent HER performance in 0.1 M KOH solution at room temperature, which only require 92 mV to obtain the current density of 10 mA cm –2 and the Tafel slope is 66 mV dec –1 . Such catalytic activity is attributed to the porous nanoarrays structure and the decoration of NiCu corresponding hydr(oxy)oxides. Overall, this study provides a superior strategy to fabricate HER catalyst material.