Synergistic catalysis of CuO/In2O3 composites for highly selective electrochemical CO2 reduction to CO

The development of low-cost, selective, and active catalysts for electrochemical CO2 reduction (ECR) remains an ongoing challenge. Here, we demonstrate for the first time, efficient ECR by exploiting interaction of CuO and In2O3. The catalytic properties of the composite catalysts can be readily tuned by manipulation of the metal oxide composition and interface, enabling remarkably high CO2-to-CO conversion with a CO faradaic efficiency of about 93.0% at -0.7 V versus reversible hydrogen electrode, outperforming many previously reported metal-based electrocatalysts.