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Modulation of an intermediate layer between NiCoP and Ni foam substrate in a microwire array electrode for enhancing the hydrogen-evolution reaction.

A hierarchical electrode consisting of a Ni foam substrate, an intermediate layer of a Mo-doped basic cobalt carbonate microwire array, and a surface layer of NiCoP was fabricated for hydrogen evolution. The introduction of the intermediate layer accounted for the low overpotential (45 mV, 10 mA cm-2) and high solar-to-hydrogen conversion efficiency (14.9%) in a PEC water splitting application.