Cobalt Doped Iron Based Perovskite Catalysts for Efficient Reduction of Nitrate to Ammonia

Abstract Electrochemical nitrate reduction reaction (NO 3 RR) has received universal attention to synthesize value‐added ammonia, which requires high‐efficiency catalysts to reduce the reaction barrier. Herein, cobalt doped SrFeO 3 nanofibers (SCFO) with abundant oxygen vacancies via electrospinning technique is proposed to convert nitrate to ammonia. Such catalyst achieves an optimum Faradaic efficiency of 81.5 % and a high NH₃ yield of 16.1 mg h −1 mg −1 cat. in a 0.1 M PBS + 0.1 M NaNO₃ solution at −0.9 V reversible hydrogen electrode (RHE). Moreover, the in‐situ electrochemical test and DFT calculations confirm the potential‐determining step (PDS) for SCFO is *NO−*N with an energy barrier of only 1.28 eV.