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Synthesis and characterization of ZnS with controlled amount of S vacancies for photocatalytic H2 production under visible light
Open accessAbstract
Controlling amount of intrinsic S vacancies was achieved in ZnS spheres which were synthesized by a hydrothermal method using Zn and S powders in concentrated NaOH solution with NaBH 4 added as reducing agent. These S vacancies efficiently extend absorption spectra of ZnS to visible region. Their photocatalytic activities for H 2 production under visible light were evaluated by gas chromatograph and the midgap states of ZnS introduced by S vacancies were examined by density functional calculations. Our study reveals that the concentration of S vacancies in the ZnS samples can be controlled by varying the amount of the reducing agent NaBH 4 in the synthesis and the prepared ZnS samples exhibit photocatalytic activity for H 2 production under visible-light irradiation without loading noble metal. This photocatalytic activity of ZnS increases steadily with increasing the concentration of S vacancies until the latter reaches an optimum value. Our density functional calculations show that S vacancies generate midgap defect states in ZnS, which lead to visible-light absorption and responded.
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Metadata
- Authors
- Wang, G., Huang, B., Li, Z., Lou, Z., Wang, Z., Dai, Y., & Whangbo, M.-H.
- Venue
- Scientific Reports
- Published
- 2015-02-25
- Volume
- 5
- Issue
- 1
- Pages
- 8544-8544
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2020199431
- Cited by
- 271
- References
- 26
- FWCI
- 6.75
- Type
- journal article
- Language
- en
- Open access
- gold
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- Wang, G., Huang, B., Li, Z., Lou, Z., Wang, Z., Dai, Y., & Whangbo, M.-H. (2015). Synthesis and characterization of ZnS with controlled amount of S vacancies for photocatalytic H2 production under visible light. Scientific Reports. https://doi.org/10.1038/srep08544
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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