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Enhanced Photocatalytic Hydrogen Evolution over Cu-Doped ZnIn2S4 under Visible Light Irradiation
Abstract
A series of Cu-doped ZnIn 2 S 4 photocatalysts has been synthesized by a facile hydrothermal method, with the copper concentration varying from 0 wt% to 2.0 wt%. The physical and photophysical properties of these Cu-doped ZnIn 2 S 4 photocatalysts were characterized by X-ray diffraction (XRD), photoluminescence spectroscopy (PL), scanning electron microscopy (SEM), and UV−visible diffuse reflectance spectroscopy (UV−vis). The diffuse reflectance and photoluminescence spectra of Cu-doped ZnIn 2 S 4 shifted monotonically to longer wavelengths as the copper concentration increased from 0 wt% to 2.0 wt%, indicating that the optical properties of these photocatalysts greatly depended on the amount of Cu doped. Meanwhile, the layered structure of ZnIn 2 S 4 would be destructed gradually by Cu doping. The photoactivity of ZnIn 2 S 4 was enhanced when Cu 2+ was doped into the crystal structure. The highest photocatalytic activity was observed on Cu (0.5 wt%)–doped ZnIn 2 S 4, with the rate of hydrogen evolution to be 151.5 μmol/h under visible light irradiation (λ > 430 nm). On the basis of the calculated energy band positions and optical properties, the effect of copper as a dopant on the photocatalytic activity of Cu-ZnIn 2 S 4 was studied.
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Metadata
- Authors
- Shen, S., Zhao, L., Zhou, Z., & Guo, L.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-09-20
- Volume
- 112
- Issue
- 41
- Pages
- 16148-16155
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W1979014950
- Cited by
- 332
- References
- 41
- FWCI
- 5.09
- Type
- journal article
- Language
- en
- Open access
- closed
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