物理化学学报2024，Vol.40Issue(11)：35-36,2.DOI:10.3866/PKU.WHXB202406027
ZnO/D-A共轭聚合物S型异质结高效光催化产H2O2及其电荷转移动力学研究
Efficient Photocatalytic Production of H2O2 over ZnO/D-A Conjugated Polymer S-Scheme Heterojunction and Charge Transfer Dynamics Investigation
摘要
Abstract
Photocatalytic technology harnesses clean,non-polluting solar energy to synthesize hydrogen peroxide(H2O2).In this study,ZnO/PBD S-scheme heterojunction composites,featuring ZnO nanoparticles on a donor-acceptor conjugated polymer substrate(PBD),were synthesized via the Suzuki-Miyaura reaction and hydrothermal method.The optimal ZnO/PBD composite achieved an H2O2 production efficiency of 4.07 mmol·g-1·h-1,which is 5.4 times higher than that of pristine ZnO.This significant enhancement is attributed to the formation of S-scheme heterojunctions.The successful construction of S-scheme heterojunctions was confirmed through UV-visible absorption spectroscopy and in situ irradiated X-ray photoelectron spectroscopy.Steady-state photoluminescence and femtosecond transient absorption(fs-TA)spectroscopies identified and verified the presence of defect states in ZnO.These defect states trap photogenerated electrons,adversely affecting the photocatalytic reaction.However,the S-scheme heterojunction effectively promotes the separation and transfer of electrons,mitigating this issue.The measured lifetimes of photogenerated electrons in these defect states,as determined by fitted fs-TA decay kinetics,provided further evidence of the carrier transfer mechanism in S-scheme heterojunctions.This work introduces a novel approach for studying organic/inorganic S-scheme heterojunctions using fs-TA spectroscopy.关键词
光催化产H2O2/S型异质结/ZnO缺陷态/fs-TA光谱Key words
Photocatalytic production of H2O2/S-scheme heterojunction/ZnO defect states/fs-TA spectroscopy分类
化学引用本文复制引用
吴优,程畅,戚克振,程蓓,张建军,余家国,张留洋..ZnO/D-A共轭聚合物S型异质结高效光催化产H2O2及其电荷转移动力学研究[J].物理化学学报,2024,40(11):35-36,2.基金项目
This work was supported by Yunnan Provincial Science and Technology Plan Project(202305AF150116) （202305AF150116）
the National Natural Science Foundation of China(22238009,U23A20102,52073223,22278324 and 22361142704) （22238009,U23A20102,52073223,22278324 and 22361142704）
the Natural Science Foundation of Hubei Province of China(2022CFA001).The project was also supported by the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan)(CUG22061). 云南省科技计划项目(202305AF150116) （2022CFA001）
国家自然科学基金(22238009,U23A20102,52073223,22278324和22361142704) （22238009,U23A20102,52073223,22278324和22361142704）
湖北省自然科学基金(2022CFA001) （2022CFA001）
中国地质大学(武汉)中央高校基本科研业务费(CUG22061)的支持 （武汉）
