Nanoporous Cu film/Cu plate with superior catalytic performance toward electro-oxidation of hydrazine

► Nanoporous Cu formed by LSV dealloying of surface Cu-Zn alloy in short time. ► Lower onset oxidation potential of hydrazine on nanoporous Cu than smooth Cu. ► Superior activity of nanoporous Cu toward oxidation of hydrazine. ► Higher stability of nanoporous Cu than Cu nanoparticles.