Fig. 1: Current state-of-the-art to access carbon isotopologues of carbon monoxide.

a Three general strategies for formal CO2-to-CO reduction. b Our work and opportunities on the rapid and full CO2-to-CO photoreduction and direct valorisation of CO.

a Three general strategies for formal CO2-to-CO reduction. b Our work and opportunities on the rapid and full CO2-to-CO photoreduction and direct valorisation of CO.