Core-Shell ZnO@Cu2O as Catalyst to Enhance the Electrochemical Reduction of Carbon Dioxide to C2 Products

The copper-based catalyst is considered to be the only catalyst for electrochemical carbon dioxide reduction to produce a variety of hydrocarbons, but its low selectivity and low current density to C2products restrict its development. Herein, a core-shell xZnO@yCu2O catalysts for electrochemical CO2reduction was fabricated via a two-step route. The high selectivity of C2products of 49.8% on ZnO@4Cu2O (ethylene 33.5%, ethanol 16.3%) with an excellent total current density of 140.1 mA cm−2was achieved over this core-shell structure catalyst in a flow cell, in which the C2selectivity was twice that of Cu2O. The high electrochemical activity for ECR to C2products was attributed to the synergetic effects of the ZnO core and Cu2O shell, which not only enhanced the selectivity of the coordinating electron, improved the HER overpotential, and fastened the electron transfer, but also promoted the multielectron involved kinetics for ethylene and ethanol production. This work provides some new insights into the design of highly efficient Cu-based electrocatalysts for enhancing the selectivity of electrochemical CO2reduction to produce high-value C2products.Keywords:CO2electrochemical reduction;core-shell structure;ZnO@Cu2O;synergy effect;C2products selectivity