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Visible Light Sensitive Photocatalyst, Delafossite Structured α-AgGaO2
Abstract
Delafossite structured alpha-AgGaO(2) powder was successfully synthesized through a cation exchange reaction. alpha-AgGaO(2) has a band gap of 2.4 eV, absorbs visible light up to 520 nm, and effectively decomposes 2-propanol to CO2 via acetone by irradiating with either UV light (300-400 nm) or visible light (420-530 nm). The values of the quantum efficiency are similar (ca. 0.6%) under light irradiations with wavelengths of 365, 390, 430, 470, and 510 +/- 10 nm, but steeply decrease with wavelengths longer than 530 +/- 10 nm, which support a 2.4 eV band gap. In contrast, the other polymorph, alpha-AgGaO(2) powder, which has a band gap of 2.1 eV, shows a negligible activity when irradiating with either UV light or visible light. The higher oxidation activity of alpha-AgGaO(2) is probably due to its larger band gap, which is formed at the top of its valence band in a lower energy region as compared to alpha-AgGaO(2). Moreover, the first-principle calculations of alpha-AgGaO(2) and alpha-AgGaO(2) clearly indicate that alpha-AgGaO(2) has a remarkably larger dispersed valence band as compared to alpha-AgGaO(2), which is advantageous to the photocatalytic activity due to the efficient hole conduction.
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Citations
Cited by
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Xu, C., Ravi Anusuyadevi, P., Aymonier, C., Luque, R., & Marre, S. (2019) · Chemical Society Reviews · doi:10.1039/c9cs00102f · Cited by 1,082
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Zhang, H., Chen, G., & Bahnemann, D. W. (2009) · Journal of Materials Chemistry · doi:10.1039/b821991e · Cited by 960
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An Efficient Visible-Light-Sensitive Fe(III)-Grafted TiO2 Photocatalyst
Yu, H., Irie, H., Shimodaira, Y., Hosogi, Y., Kuroda, Y., Miyauchi, M., & Hashimoto, K. (2010) · The Journal of Physical Chemistry C · doi:10.1021/jp1071956 · Cited by 364
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Liu, R., Wang, P., Wang, X., Yu, H., & Yu, J. (2012) · The Journal of Physical Chemistry C · doi:10.1021/jp305774n · Cited by 266
Dai, G., Yu, J., & Liu, G. (2012) · The Journal of Physical Chemistry C · doi:10.1021/jp305669f · Cited by 265
Liu, J. J., Fu, X. L., Chen, S. F., & Zhu, Y. F. (2011) · Applied Physics Letters · doi:10.1063/1.3660319 · Cited by 259
Metadata
- Authors
- Maruyama, Y., Irie, H., & Hashimoto, K.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-10-24
- Volume
- 110
- Issue
- 46
- Pages
- 23274-23278
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2076594554
- Cited by
- 162
- References
- 0
- FWCI
- 4.60
- Type
- journal article
- Language
- en
- Open access
- closed
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