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https://hdl.handle.net/2440/116850
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Type: | Journal article |
Title: | Crystal transformation of 2D tungstic acid H₂WO₄ to WO₃ for enhanced photocatalytic water oxidation |
Other Titles: | Crystal transformation of 2D tungstic acid H(2)WO(4) to WO(3) for enhanced photocatalytic water oxidation |
Author: | Ke, J. Zhou, H. Liu, J. Duan, X. Zhang, H. Liu, S. Wang, S. |
Citation: | Journal of Colloid and Interface Science, 2018; 514:576-583 |
Publisher: | Elsevier |
Issue Date: | 2018 |
ISSN: | 0021-9797 1095-7103 |
Statement of Responsibility: | Jun Ke, Hongru Zhou, Jie Liu, Xiaoguang Duan, Huayang Zhang, Shaomin Liu, Shaobin Wang |
Abstract: | New photocatalytic materials for stable reduction and/or oxidization of water by harvesting a wider range of visible light are indispensable to achieve high practical efficiency in artificial photosynthesis. In this work, we prepared 2D WO₃·H₂O and WO₃ nanosheets by a one-pot hydrothermal method and sequent calcination, focusing on the effects of crystal transformation on band structure and photocatalytic performance for photocatalytic water oxidation in the presence of electron acceptors (Ag⁺) under simulated solar light irradiation. The as-prepared WO₃ nanosheets exhibit enhanced rate of photocatalytic water oxidation, which is 6.3 and 3.6 times higher than that of WO₃·H₂O nanosheets and commercial WO₃, respectively. It is demonstrated that the releasing of water molecules in the crystal phase of tungstic acid results in transformation of the crystal phase from orthorhombic WO₃·H₂O to monoclinic WO₃, significantly improving the activity of photocatalytic water oxidation in the presence of Ag⁺ because the shift-up of conduction band of WO₃ matches well with the electrode potential of Ag⁺/Ag(s), leading to efficient separation of photoinduced electrons and holes in pure WO₃ nanosheets. |
Keywords: | Photocatalytic water oxidation; 2D materials; crystal transformation; WO₃ |
Rights: | © 2017 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.jcis.2017.12.066 |
Published version: | http://dx.doi.org/10.1016/j.jcis.2017.12.066 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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