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- Title
Unraveling the Interfacial Charge Migration Pathway at the Atomic Level in a Highly Efficient Z‐Scheme Photocatalyst.
- Authors
Wang, Pengfei; Mao, Yueshuang; Li, Lina; Shen, Zhurui; Luo, Xiao; Wu, Kaifeng; An, Pengfei; Wang, Haitao; Su, Lina; Li, Yi; Zhan, Sihui
- Abstract
A highly efficient Z‐scheme photocatalytic system constructed with 1D CdS and 2D CoS2 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 CoS2 through a transition atomic layer connected by Co–S5.8 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/CoS2. This study elucidates the key role of interfacial atomic layers in heterojunctions and will facilitate the development of more efficient Z‐scheme photocatalytic systems.
- Subjects
ATOMIC transitions; QUANTUM efficiency; SURFACE reactions; PLASMA sheaths; HETEROJUNCTIONS; ELECTRONS; CHARGE exchange
- Publication
Angewandte Chemie, 2019, Vol 131, Issue 33, p11451
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201904571