Sustainable at both ends: electrochemical CO2utilization paired with electrochemical treatment of nitrogenous waste

We discuss the environmental and energetic benefits of coupling nitrogenous waste treatment with the electrochemical conversion of CO(2)to value-added productsviadirect reduction or electrocarboxylation. In particular, we demonstrate that co-electrolysis of urea or ammonia with CO(2)requires significantly lower cell voltages than CO(2)electrolyzers relying on the oxygen evolution reaction as an anodic process.