Simultaneous ozone and hydrogen peroxide electrosynthesis via defect modulation in Ni, Sb‐doped SnO<sub>2</sub> electrocatalysts
Lei Ding, Wenwen Li, Mingzhe Xue, Xiaoge Peng, Huaijie Shi, Jia Liu, Xiaosa Wang, Chenghang Jiang, Yufeng Xue, Shibin Wang, Xing Zhong, Jianguo Wang
Abstract
Abstract Electrochemical synthesis of green oxidants O 3 and H 2 O 2 is valuable for applications, but challenges persist in enhancing the O 3 and H 2 O 2 generation activity and combined application. Herein, we modulate the surface Ni active sites and oxygen vacancy defects content in Ni‐Sb‐SnO 2 electrocatalysts to enhance selectivity for electrochemical ozone generation (EOP) and two‐electron electrochemical oxygen reduction reactions (2e − ORR). The Ni active sites and oxygen vacancy defects enriched electrocatalysts resulting in an ozone faradaic efficiency of 48.1%, while non‐enriched electrocatalyst obtained 90% selectivity for H 2 O 2 . Theoretical calculations revealed that Ni‐Sb‐SnO 2 efficiently captures O 2 with defective O vac2 stabilize intermediates, facilitating O 3 and H 2 O 2 synthesis. Moreover, concerted EOP and 2e − ORR enable concurrent generation of O 3 and H 2 O 2 for efficient synergistic degradation of organic pollutants, while attenuating the energy demands of the electrolyzer. This study provides an appealing strategy for simultaneous production of O 3 and H 2 O 2 with applications in wastewater treatment.