We prepare three-dimensional honeycomb-like CuCoO nanosheet arrays supported by Ni foam via electrochemical codeposition of cobalt and copper hydroxides on Ni foam followed by thermal oxidation. The codeposition with Cu changes the morphology of the cobalt hydroxide deposit to form honeycomb-like nanostructures, significantly decreasing the onset potential for oxygen evolution. The CuCoO anode displays an exceptionally low overpotential of 290 mV at a current density of 10 mA cm in 1 M KOH, and an anion-exchange membrane water electrolysis cell employing the above anode achieves a current density of 100 mA cm at 1.68 V in 0.1 M KOH.
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