Article: Surface properties of Ta₂O₅ layers prepared on SBA-15
Catalysis today. 2012 Sept. 30, v. 192, no. 1
2012
Abstract: Ta₂O₅ layer was prepared onto SBA-15 (Ta₂O₅/SBA-5) with Ta ethoxide precursor ... The surface properties of Ta₂O₅/SBA-5 was the same as those of mesoporous Ta₂O₅, possessing electron accepting sites and ... The drastic blue shift in UV–vis absorption band was observed when the phase of Ta₂O₅ became thinner ...
Abstract | Ta₂O₅ layer was prepared onto SBA-15 (Ta₂O₅/SBA-5) with Ta ethoxide precursor. The surface properties of Ta₂O₅/SBA-5 was the same as those of mesoporous Ta₂O₅, possessing electron accepting sites and hydrophobicity, but the structural stability upon thermal treatment was improved due to the presence of SBA-5. The drastic blue shift in UV–vis absorption band was observed when the phase of Ta₂O₅ became thinner. Accordingly, band gaps of Ta₂O₅ samples increased from 4.0 (nonporous Ta₂O₅) to 4.3eV (mesoporous Ta₂O₅, 2.3nm wall thickness), and further increased to 4.9eV for thin-layered Ta₂O₅/SBA-5 (0.5nm Ta₂O₅ layer). Thus, stable activity for photocatalytic water decomposition was not observed over thin-layered Ta₂O₅/SBA-5. |
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Keywords | absorption ; catalytic activity ; heat treatment ; hydrophobicity |
Language | English |
Dates of publication | 2012-0930 |
Size | p. 197-202. |
Publishing place | Elsevier B.V. |
Document type | Article |
ZDB-ID | 2012626-8 |
ISSN | 0920-5861 |
ISSN | 0920-5861 |
DOI | 10.1016/j.cattod.2012.01.019 |
Database | NAL-Catalogue (AGRICOLA) |
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