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Defect-Induced Band Gap Narrowed CeO2 Nanostructures for Visible Light Activities
Abstract
This work reports an electron beam irradiation (30 kGy and 90 kGy) approach to narrow the band gap of the pristine CeO 2 nanostructure (p-CeO 2 ) to enhance their visible light activity through defect engineering. This was confirmed by diffuse reflectance spectroscopy, photoluminescence, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller, electrochemical impedance spectroscopy, and linear scan voltammetry. XPS revealed changes in the surface states, composition, Ce 4+ to Ce 3+ ratio, and other defects in the modified CeO 2 nanostructures (m-CeO 2 ). The m-CeO 2 exhibits excellent photocatalytic activities by degrading 4-nitrophenol and methylene blue in the presence of visible light (λ > 400 nm) compared to the p-CeO 2 . The optical, photocatalytic, and photoelectrochemical studies and proposed mechanism further support the enhanced visible light photocatalytic activities of the m-CeO 2 . This study confirmed that defect-induced band gap engineered m-CeO 2 could be used effectively as photocatalyst and photoelectrodes owing to their enhanced visible light photocatalytic activities.
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Citations
Cited by
Fundamentals and Catalytic Applications of CeO 2 -Based Materials
Montini, T., Melchionna, M., Monai, M., & Fornasiero, P. (2016) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00603 · Cited by 2,766
Metal oxides as photocatalysts
Khan, M. M., Adil, S. F., & Al-Mayouf, A. (2015) · Journal of Saudi Chemical Society · doi:10.1016/j.jscs.2015.04.003 · Cited by 678
Self-citationPu, Y., Luo, Y., Wei, X., Sun, J., Li, L., Zou, W., & Dong, L. (2019) · Applied Catalysis B: Environmental · doi:10.1016/j.apcatb.2019.04.093 · Cited by 359
Ma, R., Jahurul Islam, M., Amaranatha Reddy, D., & Kim, T. K. (2016) · Ceramics International · doi:10.1016/j.ceramint.2016.08.186 · Cited by 137
Metadata
- Authors
- Khan, M. M., Ansari, S. A., Pradhan, D., Han, D. H., Lee, J., & Cho, M. H.
- Venue
- Industrial & Engineering Chemistry Research
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-05-28
- Volume
- 53
- Issue
- 23
- Pages
- 9754-9763
- ISSN
- 0888-5885 (ISSN-L)
- 1520-5045
- OpenAlex
- W2095322891
- Cited by
- 361
- References
- 0
- FWCI
- 8.40
- Type
- journal article
- Language
- en
- Open access
- closed
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- Khan, M. M., Ansari, S. A., Pradhan, D., Han, D. H., Lee, J., & Cho, M. H. (2014). Defect-Induced Band Gap Narrowed CeO2 Nanostructures for Visible Light Activities. Industrial & Engineering Chemistry Research. https://doi.org/10.1021/ie500986n
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