期刊
ACS NANO
卷 14, 期 5, 页码 5468-5479出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b09470
关键词
Cu-I@MoS2 catalytic and protective layers; femtosecond transient absorption; mapping surface charge distribution; photocatalytic water splitting; stratified CdS-Cu2-xS/MoS2
类别
资金
- National Natural Science Foundation of China [21475021, 21427807, 21777096]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Key Laboratory of Analytical Chemistry for Life Science [5431ZZXM1803]
Heterojunction photocatalysts are widely adopted for efficient water splitting, but ion migration can seriously threaten the stability of heterojunctions, as with the well-known low stability of CdS-Cu2-xS due to intrinsic Cu+ ion migration. Here, we utilize Cu+ migration to design a stratified CdS-Cu2-xS/MoS2 photocatalyst, in which Cu-I@MoS2 (Cu-I-intercalated within the MoS2 basal plane) is created by Cu+ migration and intercalation to the adjacent MoS2 surface. The epitaxial vertical growth of the Cu-I@MoS2 nanosheets on the surface of one-dimensional core-shell CdS-Cu2-xS nanorods forms catalytic and protective layers to simultaneously enhance catalytic activity and stability. Charge transfer is verified by kinetics measurements with femtosecond time-resolved transient absorption spectroscopy and direct mapping of the surface charge distribution with a scanning ion conductance microscope. This design strategy demonstrates the potential of utilizing hybridized surface layers as effective catalytic and protective interfaces for photocatalytic hydrogen production.
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