Synthesis of Ce‐Doped MIL‐125‐NH₂ for Promoting Catalytic H₂O₂ Production from Water and O₂ under Visible Light Irradiation

Abstract

Despite the direct utilizing metal-organic frameworks (MOFs) as promising photocatalysts for H 2 O 2 production, their activity and selectivity are still undesirable owing to the insufficient active centers, weak visible-light absorption, and limited charge transfer. Herein, the Ce-doped Tibased MOFs MIL-125-NH 2 photocatalysts (Ce/TiMOFs) were synthesized by a facile impregnation-coordination method, during which the doped Ce species could not only extend the visible-light absorption edge but also provide new reactive sites for promoting the charge transfer and selectiv-ity of two-electron O 2 reduction. Interestingly, the optimal Ce/TiMOFs-0.010 achieved a rate of H 2 O 2 yield of 2464 μM h À 1 g À 1 with ~3.4-fold improvement compared to TiMOFs, attributed to the faster conversion rate of the main reactive oxygen intermediates ( * O 2 À ) and improved average transfer electron number. This work provides an effective strategy to optimize the photocatalytic performances of MOFs and expands the application of MOFs in the sustainable energy production field.