Solar energy powered electrochemical reduction of CO on InO nanosheets with high energy conversion efficiency at a large current density.

Electrochemical CO reduction (ECOR) to value-added chemicals offers a promising approach to both mitigate CO emission and facilitate renewable energy conversion. We demonstrate a solar energy powered ECOR system operating at a relatively large current density (57 mA cm) using InO nanosheets (NSs) as the cathode and a commercial perovskite solar cell as the electricity generator, which achieves the high solar to formate energy conversion efficiency of 6.6 %.