Highlights A promising solar-powered environmentally friendly process for the synthesis and application of catalysts for hydrogen evolution reaction has been proposed. A delicate NiCo(OH).sub.x-Co.sub.yW catalyst with a bush-like heterostructure was realized via gas-template-assisted electrodeposition, followed by electrochemical etching process. The excellent catalytic effect of NiCo(OH).sub.x-Co.sub.yW for the hydrogen evolution reaction was systematically investigated through various physical and electrochemical analyses.
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