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Unraveling the Interfacial Charge Migration Pathway at the Atomic Level in a Highly Efficient Z‐Scheme Photocatalyst
Author(s) -
Wang Pengfei,
Mao Yueshuang,
Li Lina,
Shen Zhurui,
Luo Xiao,
Wu Kaifeng,
An Pengfei,
Wang Haitao,
Su Lina,
Li Yi,
Zhan Sihui
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201904571
Subject(s) - photocatalysis , heterojunction , charge carrier , charge (physics) , ultrafast laser spectroscopy , trapping , electron , absorption (acoustics) , spectroscopy , materials science , quantum yield , chemical physics , absorption spectroscopy , photochemistry , chemistry , atomic physics , optoelectronics , physics , catalysis , optics , fluorescence , ecology , biochemistry , quantum mechanics , composite material , biology
A highly efficient Z‐scheme photocatalytic system constructed with 1D CdS and 2D CoS 2 exhibited high photocatalytic hydrogen‐evolution activity of 5.54 mmol h −1 g −1 with an apparent quantum efficiency of 10.2 % at 420 nm. More importantly, its interfacial charge migration pathway was unraveled: The electrons are efficiently transferred from CdS to CoS 2 through a transition atomic layer connected by Co–S 5.8 coordination, thus resulting in more photogenerated carriers participating in surface reactions. Furthermore, the charge‐trapping and charge‐transfer processes were investigated by transient absorption spectroscopy, which gave an estimated charge‐separation yield of approximately 91.5 % and a charge‐separated‐state lifetime of approximately (5.2±0.5) ns in CdS/CoS 2 . This study elucidates the key role of interfacial atomic layers in heterojunctions and will facilitate the development of more efficient Z‐scheme photocatalytic systems.