Facile design of <scp>oxide‐derived Cu</scp> nanosheet electrocatalyst for <scp>CO₂</scp> reduction reaction

Abstract

Abstract Despite of superior performance of the oxide‐derived copper (OD‐Cu) in producing valuable hydrocarbons during CO 2 RR, its fabrication process is still ambiguous and complicated. In this work, we develop a simple microwave‐assisted method to synthesize the oxide‐derived Cu nanosheet (OD‐Cu NS) and reveal that the oxidation state of Cu species is controlled by varying the Cu precursor amount. Notably, the simultaneous formation of nano‐sized Cu domains influence the surface roughness of OD‐Cu NS. The partially oxidized Cu surface exhibits a superior faradaic efficiency (FE) of C 2+ products up to 72%, along with a partial current density of 55 mA cm −2 in a neutral KHCO 3 solution. More importantly, the as‐obtained OD‐Cu NS shows a synergetic effect on dissociating of CO 2 molecules by the strong binding energy and promoting of C 2+ compounds productivity by the enlarged electrochemical surface area. This work provides a new insight for designing efficient OD‐Cu catalysts toward CO 2 RR. image