Hierarchical nickel oxide nanosheet@nanowire arrays on nickel foam: an efficient 3D electrode for methanol electro-oxidation

Abstract

In this work, we report the first fabrication of hierarchical nickel oxide nanosheet@nanowire arrays on nickel foam (NiO NS@NW/NF) through a hydrothermal process followed by annealing treatment. When directly used as a 3D anode for electro-oxidation of methanol in alkaline media, the NiO NS@NW/NF electrode exhibits high electrocatalytic activity and stability. It can afford a current density of 89 mA cm⁻² at 1.62 V (vs. RHE) in 1 M KOH with 0.5 M methanol.