3D hierarchical CuO/Co3O4 core–shell nanowire array on copper foam for on-demand hydrogen generation from alkaline NaBH4 solution

Abstract

In this work, we demonstrate the first use of a 3D hierarchical CuO/Co₃O₄ core–shell nanowire array in situ grown on copper foam as a robust and highly active catalyst toward the hydrolytic dehydrogenation of NaBH₄ for on-demand hydrogen generation in alkaline solutions. This monolithic catalyst exhibits a maximum hydrogen generation rate of 6162.55 mL min⁻¹ g_(CuO/Co3O4)⁻¹ under ambient conditions, which is higher than that of most reported Co-based catalysts, with an activation energy of 56.38 kJ mol⁻¹. It also shows good durability and reusability and can be used as an on/off switch for on-demand hydrogen generation.