Self-supported CuCo/Cu Nanowires as A Bifunctional Catalyst for Efficient Ammonia Synthesis

Ammonia (NH 3 ) is one of the important chemicals in human society. Conversion of air and water to NH 3 by plasma treatment and electrocatalytic reduction is a prospective approach. Herein, a self-supported CuCo/Cu nanowires (NWs) catalyst is prepared through simple electrochemical methods, achieving exceptional eNO x - RR performance: 99.8% Faradaic efficiency and 230.3   mg   h -1 cm -2 NH 3 yield rate at -0.7   V vs. RHE in 1   M NaOH with 0.2   M NO x - . The 3D NWs architecture provides abundant exposed active sites, significantly improving the catalyst's NO x - reduction activity. Besides, the introduction of Co modulates the electronic structure of Cu while serving as a complementary site for active hydrogen (*H) supply, thereby synergistically promoting the eNO x - RR process. Finally, CuCo/Cu NWs serve as a bifunctional catalyst coupled with the anodic hydrazine oxidation reaction (HzOR) instead of the oxygen evolution reaction (OER), effectively reducing the energy consumption of the eNO x - RR system and achieving a greener and energy conservation route for the synthesis of NH 3 .