The exploitation of highly active and stable catalysts for reduction of CO and water oxidation is one of the approaches to facilitate scalable and sustainable CO reduction potentially at the industrial scale. Herein, a feasible strategy to rationally build an overall CO + HO electrocatalytic reaction device is the preparation and matchup of a high-performance CO reduction catalyst and low-cost and highly active oxygen anode catalyst. A heterostructured nanosheet, γ-NiOOH/NiCO/Ni(HCOO), exhibited superior catalytic activity in the oxygen evolution reaction, and was integrated with CoPc/Fe-N-C to build an overall CO + HO cell with a current density of 10 mA cm at a very low cell voltage of 1.97 V, and the faradaic deficiency of CO to CO was maintained at greater than 90% at 1.9 V.
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