Co3O4@Co9S8 nanowires as a tandem catalyst for efficient electrochemical reduction of nitrate to ammonia

Co 3 O 4 @Co 9 S 8 /NF attains an NH 3 yield rate and Faraday efficiency of up to 538.09 μmol h −1 cm −2 and 85.88% at −1.1 V versus reversible hydrogen electrode in 0.1 M Na 2 SO 4 electrolyte with 0.01 M NaNO 3 .