Nanostructuring of metal surfaces by corrosion for efficient water splitting

â¿¢Ni(OH)2-based nanostructures were produced on a Ni substrate by a simple corrosion process.â¿¢Ni(OH)2-based nanostructures were highly active for hydrogen and oxygen evolution reactions.â¿¢The water-splitting current density was more than three times that obtained on Pt electrodes.