| Visible light sensitive photocatalyst, delafossite structured alpha-AgGaO(2). | |
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MedLine Citation:
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PMID: 17107176 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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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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Authors:
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Yoshihiko Maruyama; Hiroshi Irie; Kazuhito Hashimoto |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The journal of physical chemistry. B Volume: 110 ISSN: 1520-6106 ISO Abbreviation: J Phys Chem B Publication Date: 2006 Nov |
Date Detail:
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Created Date: 2006-11-19 Completed Date: 2007-02-12 Revised Date: 2007-03-23 |
Medline Journal Info:
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Nlm Unique ID: 101157530 Medline TA: J Phys Chem B Country: United States |
Other Details:
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Languages: eng Pagination: 23274-8 Citation Subset: - |
Affiliation:
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Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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