Assembly of highly efficient overall CO 2 + H 2 O electrolysis cell with the matchup of CO 2 reduction and water oxidation catalyst.

The exploitation of highly active and stable catalysts for reduction of CO 2 and water oxidation is one of the approaches to facilitate scalable and sustainable CO 2 reduction potentially at the industrial scale. Herein, a feasible strategy to rationally build an overall CO 2 + H 2 O electrocatalytic reaction device is the preparation and matchup of a high-performance CO 2 reduction catalyst and low-cost and highly active oxygen anode catalyst. A heterostructured nanosheet, γ-NiOOH/NiCO 3 /Ni(HCOO) 2 , exhibited superior catalytic activity in the oxygen evolution reaction, and was integrated with CoPc/Fe-N-C to build an overall CO 2 + H 2 O cell with a current density of 10 mA cm -2 at a very low cell voltage of 1.97 V, and the faradaic deficiency of CO 2 to CO was maintained at greater than 90% at 1.9 V.