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β-AgAl1-xGaxO2 Solid-Solution Photocatalysts: Continuous Modulation of Electronic Structure toward High-Performance Visible-Light Photoactivity
Abstract
A series of β-AgAl(1-x)Ga(x)O(2) solid-solution materials were explored as novel visible-light-sensitive photocatalysts. These Ag-based solid solutions crystallize in a homogeneous crystal structure with orthorhombic symmetry but possess continuously modulated band gaps from 2.19 to 2.83 eV by decreasing the ratios of Ga/Al. Their photoactivities for iso-propanol degradation were found to be dependent on the variation of chemical compositions. Among them, the β-AgAl(0.6)Ga(0.4)O(2) sample showed the highest photocatalytic performance, which simultaneously exhibited 35 and 63 times higher activities than two terminus materials, β-AgAlO(2) and β-AgGaO(2), respectively. The apparent quantum efficiency of this sample for iso-propanol photodegradation achieved up to 37.3% at the wavelength of 425 ± 12 nm. The theoretical calculation based on density functional theory demonstrated that the levels of valence band maximum of β-AgAl(1-x)Ga(x)O(2) are similar, but the levels of conduction band minimum are gradually negatively shifted with the increase of the ratio of Ga/Al, thereby continuously narrowing the band gap. Nevertheless, the highest activity observed on β-AgAl(0.6)Ga(0.4)O(2) may be attributed to its optimized band structure, which adapts the balance between effective visible-light absorption and adequate redox potentials.
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Metadata
- Authors
- Ouyang, S., & Ye, J.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-03-10
- Volume
- 133
- Issue
- 20
- Pages
- 7757-7763
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2081438412
- Cited by
- 287
- References
- 35
- FWCI
- 11.56
- Type
- journal article
- Language
- en
- Open access
- closed
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