物理化学学报2024，Vol.40Issue(11)：53-54,2.DOI:10.3866/PKU.WHXB202407012
构建双通道路径增强iCOF/Bi2O3 S型异质结在纯水体系中光催化合成H2O2性能
Improving Photocatalytic H2O2 Production over iCOF/Bi2O3 S-Scheme Heterojunction in Pure Water via Dual Channel Pathways
摘要
Abstract
Solar photocatalysis is a green,economical,and sustainable method for H2O2 synthesis,which has been regarded as the most promising alternative to the traditional anthraquinone oxidation method.However,single-component photocatalyst exhibits moderate activity owing to the limited light-harvesting range,fast charge recombination and inadequate redox capacity.Moreover,the addition of sacrificial agents is required in the reaction system.Herein,we present the development of an S-scheme heterojunction,achieved through photodepositing Bi2O3 nanoparticles(BO)on ionic covalent organic framework nanofiber(iCOF).The optimized photocatalyst iCOF/BO10 shows the highest H2O2 production performance in pure water,achieving an H2O2 yield of 9.76 mmol·g−1·h−1 with an apparent quantum yield(AQY)of 5.5%at 420 nm.This photocatalytic performance is approximately 2.2 and 5.6 times as high as that of pristine iCOF and BO,respectively.In-depth characterizations including in situ irradiated XPS,DFT-calculations,active species trapping experiments and in situ DRIFTS,reveal that the obtained sample not only facilitates charge carrier separation and enhances light absorption capability,but also maximizes the redox ability to concurrently achieve indirect 2e− ORR and 4e− WOR for H2O2 production.Additionally,the generated O2 from the 4e−WOR is capable of accelerating the reaction kinetics for H2O2 formation via the indirect 2e− ORR pathway,enabling overall photocatalytic H2O2 synthesis.This work provides a new insight into creating innovative catalysts for achieving high-efficiency photosynthesis of H2O2.关键词
光催化/S型异质结/H2O2合成/无牺牲剂/双通道路径Key words
Photocatalysis/S-scheme heterojunction/H2O2 production/Non-sacrificial agent/Dual channels分类
化学化工引用本文复制引用
夏阳,张康延,杨恒,史利娟,易群..构建双通道路径增强iCOF/Bi2O3 S型异质结在纯水体系中光催化合成H2O2性能[J].物理化学学报,2024,40(11):53-54,2.基金项目
This work was supported by the National Natural Science Foundation of China(2210821),the Key Research and Development Project of Hainan Province(ZDYF2024GXJS005)and the Research and Innovation Initiatives of WHPU(2024Y18). 国家自然科学基金(2210821),海南省重点研发项目(ZDYF2024GXJS005),武汉轻工大学校立研究与创新项目(2024Y18)资助 （2210821）
