Nanoparticle heterojunctions in ZnS/ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation
We report one-step hydrothermal preparation of ZnS/ZnO hybrid nanowires consisting of well-distributed nanoparticle-heterojunctions that induce high activity for visible-light-driven H2 evolution even without any noble metal co-catalysts. During the growth process, the nanoparticulated ZnS nanowir...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/95757 http://hdl.handle.net/10220/10197 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We report one-step hydrothermal preparation of ZnS/ZnO hybrid nanowires consisting of well-distributed
nanoparticle-heterojunctions that induce high activity for visible-light-driven H2 evolution even without
any noble metal co-catalysts. During the growth process, the nanoparticulated ZnS nanowires formed first,
followed by ZnO nanocrystal growth with intercalation inside the ZnS nanowires. This growth mode
10 could result in enriched ZnS-surface-states on the ZnO nanocrystal surfaces, as evidenced by the
weakened absorption features and quenched band gap emission of ZnO in the ZnS/ZnO hybrid nanowires.
Further studies by varying the ZnS to ZnO ratio in the ZnS/ZnO hybrids also proved that the population
of ZnS-surface-states is crucial to the visible-light activity for photocatalytic H2 evolution. This work
provides a meaningful way to develop heterostructured composites as visible-light-active photocatalysts
15 by using wide band gap semiconductors for solar fuels production. |
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