Rod-Like Fe, Bi Co-doped Co3O4 as an Efficient Electrocatalyst for Chlorine Evolution Reaction and Ammonia-Nitrogen-Oxidation in Water

Graphical In this paper, a rod-like Fe and Bi co-doped Co 3 O 4 is prepared by hydrothermal method as an electrocatalyst for chlorine evolution reaction and ammonia nitrogen degradation. Compared to Co 3 O 4 , the doping of Fe and Bi can effectively improve the electrocatalytic performance, providing a new design idea for the construction of electrode materials with high activity and selectivity. 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%.