物理化学学报2025，Vol.41Issue(8)：93-102,10.DOI:10.1016/j.actphy.2025.100084
CdS/DBTSO-BDTO S型异质结光催化制氢及其电荷转移动力学
CdS/DBTSO-BDTO S-scheme photocatalyst for H2 production and its charge transfer dynamics
摘要
Abstract
Photocatalytic hydrogen(H2)production is a clean energy technology,with great potential for addressing the global energy crisis and related environmental problems.However,single-component photocatalysts often suffer from low efficiency primarily due to fast charge carrier recombination and the tradeoff between light-absorbing capacity and redox capabilities.Constructing heterojunctions provides a promising strategy to overcome these drawbacks,and S-scheme heterojunctions have recently stood out,demonstrating the capability to efficiently facilitate electron/hole separation,while maximizing the redox capability.Among them,polymer-based S-scheme photocatalysts are emerging,though the charge carrier dynamics in inorganic-organic S-scheme heterojunctions remain to be elucidated.Herein,we fabricated an S-scheme heterojunction comprised of the conjugated polymer dibenzothiophene-S,S-dioxide-alt-benzodithiophene(DBTSO-BDTO)and cadmium sulfide(CdS)for photocatalytic H2 production.The S-scheme mechanism was verified using in situ irradiated X-ray photoelectron spectroscopy,and the charge carrier transfer dynamics were analyzed in depth using femtosecond transient absorption spectroscopy,which revealed that a considerable fraction of electrons undergo interfacial charge transfer in the CdS/DBTSO-BDTO composite.Owing to the improved charge separation efficiency and redox capability,the performance of the composite surpassed that of DBTSO-BDTO and CdS,and the H2 evolution rate of the optimized CdS/DBTSO-BDTO material reached 3313 μmol·h-1·g-1,three times that of pure CdS.The findings provide new insights into the electron transfer mechanisms of S-scheme heterojunctions,and can guide the design of polymer-based photocatalysts for solar fuel production.关键词
光催化/硫化镉/S型异质结/产氢/飞秒瞬态吸收光谱Key words
Photocatalysis/Cadmium sulfide/S-scheme heterojunction/H2 production/Femtosecond transient absorption spectroscopy分类
化学化工引用本文复制引用
蔡家杰,程畅,刘博文,张建军,姜传佳,程蓓..CdS/DBTSO-BDTO S型异质结光催化制氢及其电荷转移动力学[J].物理化学学报,2025,41(8):93-102,10.基金项目
This work was supported by the National Key Research and Development Program of China(2022YFB3803600),the National Natural Science Foundation of China(22238009,22361142704,22261142666,22278324,52073223),the Natural Science Foundation of Hubei Province of China(2022CFA001),and the Fundamental Research Funds for the Central Universities(63241632).国家重点研发计划项目(2022YFB3803600),国家自然科学基金项目(22238009,22361142704,22261142666,22278324,52073223),湖北省自然科学基金项目(2022CFA001),中央高校基本科研业务费项目(63241632)资助 （2022YFB3803600）
