Tandem Active Sites in Cu/Mo‐WO 3 Electrocatalysts for Efficient Electrocatalytic Nitrate Reduction to Ammonia

Abstract Electrocatalytic NO 3 − reduction to NH 3 is a promising technique for both ammonia synthesis and nitrate wastewater treatment. However, this conversion involves tandem processes of H 2 O dissociation and NO 3 − hydrogenation, leading to inferior NH 3 Faraday efficiency (FE) and yield rate. Herein, a tandem catalyst by anchoring atomically dispersed Cu species on Mo‐doped WO 3 (Cu 5 /Mo 0.6 ‐WO 3 ) for the NO 3 RR is constructed, which achieves a superior FE N H 3 of 98.6% and a yield rate of 26.25 mg h −1 mg cat −1 at −0.7 V (vs RHE) in alkaline media, greatly exceeding the performance of Mo 0.6 ‐WO 3 and Cu 5 /WO 3 counterparts. Systematic electrochemical measurement results reveal that the promoted…

• NN
  National Natural Science Foundation of China

  Awards: 22106106, 22236005
• NK
  National Key Research and Development Program of China

  Award: 2020YFA0211004