Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 33, Pages 16560-16568Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.04.154
Keywords
Gray Ta2O5; Oxygen vacancy; Surface disorder; Photocatalytic hydrogen generation; DFT calculations; IPCE
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Funding
- Ministry of Science and Technology, Taiwan [MOST 104-2221-E007-051-MY3]
- MOST [108-2112-M-007-023-MY3, 109-3116-F007-001]
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White and gray Ta2O5 powders were fabricated by sol-gel and then annealed at 850 degrees C in air and vacuum, respectively. Analyses by Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, electron paramagnetic resonance spectroscopy, UV-visible reflectance spectroscopy, photoluminescence spectroscopy, and density functional theory calculations indicated that oxygen vacancies are formed on the surface of gray Ta2O5, resulting in a disordered shell and more absorption of visible light. Its surface concentration ratio of oxygen to tantalum was determined to be 2.31. It generated 48% higher photocatalytic hydrogen than that of the white one, and cycling test indicated that it remained stable during 12 h irradiation. It also exhibited higher incident photon-to-current conversion efficiency than that of white Ta2O5 in the wavelength range of 300-600 nm. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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