Abstract
High deuteration yields are difficult to attain with conventional chemical synthesis methods. In this work, we demonstrate that deuterated chemicals can be produced using electrochemical CO 2 reduction in the presence of D 2 O. The absence of H 2 O enables deuteration yields over 99% for products such as ethanol-d 6 and formate-d. With a D 2 O solvent, the competing D 2 evolution reaction is completely suppressed at low current densities while being kept <10% at a higher 300 mA/cm 2 .