Boosting the Faradaic Efficiency of Br−‐Mediated Photoelectrochemical Epoxidation by Local Acidity on α‐Fe2O3

• DOI: 10.1002/advs.202401685
• Publication Date: 2024-04-26T05:39:06Z
• Authors: Meng‐Yu Duan; Dao‐Jian Tang; Jie Yang; Si‐Peng Yang; Chao‐Yuan Deng; Yu‐Kun Zhao; Ji‐Kun Li; Yu‐Chao Zhang; Chun‐Cheng Chen; Jin‐Cai Zhao
• Keywords: Alkene

Abstract The redox mediated photoelectrochemical (PEC) or electrochemical (EC) alkene oxidation process is a promising method to produce high value‐added epoxides. However, due the competitive reaction of water and overoxidation mediator, utilization electricity far below ideal value, where loss epoxidation's faradaic efficiency (FE) ≈50%. In this study, Br − /HOBr‐mediated developed achieve near‐quantitative selectivity ≈100% FE styrene oxide on α‐Fe 2 O 3 , in which low concentration as mediator locally generated acidic micro‐environment work together higher active HOBr species. A variety derivatives are investigated with satisfied epoxidation performance. Based analysis local pH‐dependent products distribution, study further verified that serves true generate bromohydrin intermediate. It believed strategy can greatly overcome limitation enable future industrial applications.