Rod‐Like Fe, Bi Co‐doped Co ₃ O ₄ as an Efficient Electrocatalyst for Chlorine Evolution Reaction and Ammonia‐Nitrogen‐Oxidation in Water

Abstract Chlorine evolution reaction (CER) using dimensionally stable anode (DSA) materials are widely used in the chlor‐alkali industry. However, they still have problems such as high preparation cost, limited selectivity, the titanium substrate being easy to passivate, [ 2 ] and the electrode active material being easy to dissolve. Co 3 O 4 , a nonprecious metal material, has shown good catalytic potential in promoting the CER reaction, which has broad application prospects as a CER electrocatalyst. In this paper, a highly regular Rod‐like Fe, Bi co‐doped Co 3 O 4 electrocatalyst was prepared. Compared with pure Co 3 O 4 , the material had a larger electrochemical‐specific surface area, lower charge transfer resistance, and better catalytic performance. In a 0.6 M NaCl solution, at a current density of 20 mA/cm 2 , it achieves a current efficiency of 91.8% and degrades ammonia nitrogen with an efficiency of 82%.