Bias-free electrocatalytic nitrite-to-ammonia synthesis by coupling with anodic hydrazine oxidation over a low-coordination Ru nanocluster catalyst.

By coupling anodic HzOR with NO2RR, a bias-free NH3 electrosynthesis system was developed. The highly exposed active sites and unsaturated coordination structures significantly enhance the reactivity of HzOR and NO2RR over the Ru nanocluster, providing an approach for energy-efficient ammonia synthesis coupled with hazardous waste degradation.