Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Abstract

AbstractThe concomitant degradation of organic contaminants using green oxidants, NaClO and O3, exhibits great potential to mitigate the deleterious impact of organic pollutants. In this work, the electrochemical ozone production (EOP) and chlorine evolution reaction (CER) performed by highly active electrocatalysts composed of Ce‐Ni‐Sb‐SnO2 and Ru‐Ir‐Ce‐Ni‐Sb‐SnO2, respectively, are presented. Ce‐Ni‐Sb‐SnO2 exhibits high selectivity with a 43.9% Faraday efficiency in EOP. Incorporating Ru and Ir in Ru‐Ir‐Ce‐Ni‐Sb‐SnO2 improves CER performance, achieving outstanding Faraday efficiency of up to 98.3%. Additionally, it achieves a low overpotential of ≈80 mV at 10 mA cm−2 with 0.3 m NaCl (pH = 6). Theoretical calculations reveal the significant impact of multicomponent oxides on reaction intermediate adsorption. Ce, Ni, Sb doping on SnO2 enhances O2 and O3 adsorption for optimal EOP performance, while Ru and Ir doping on Ce‐Ni‐Sb‐SnO2 enhances Cl adsorption, boosting CER performance. Further investigations into the decomposition of pesticides and antibiotics demonstrate that the collaborative impact of O3 and NaClO elicits a significantly more robust kinetic degradation rate in comparison to their individual influences. This work aims to shed light on the synthesis of multicomponent metal oxides as potential precursors for the cost‐effective preparation of O3 and NaClO for electrochemical advanced oxidation processes.