MoS2-Stratified CdS-Cu2–xS Core–Shell Nanorods for Highly Efficient Photocatalytic Hydrogen Production
| Autor: | Guoning Liu, Rong Jin, Charles Kolodziej, Dechen Jiang, Yongbing Lou, Jinxi Chen, Shaopeng Qi, Clemens Burda, Yixin Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Engineering General Physics and Astronomy Heterojunction 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Chemical engineering Photocatalysis Water splitting General Materials Science Nanorod Surface charge 0210 nano-technology Photocatalytic water splitting Hydrogen production |
| Zdroj: | ACS Nano. 14:5468-5479 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | 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 CuI@MoS2 (CuI-intercalated within the MoS2 basal plane) is created by Cu+ migration and intercalation to the adjacent MoS2 surface. The epitaxial vertical growth of the CuI@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. |
| Databáze: | OpenAIRE |
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