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Primary photocatalytic water reduction and oxidation at an anatase TiO2 and Pt-TiO2 nanocrystalline electrode revealed by quantitative transient absorption studies

Liu, Hanming ; Liu, Maning LU orcid ; Nakamura, Ryosuke and Tachibana, Yasuhiro (2021) In Applied Catalysis B: Environmental 296.
Abstract

Quantitative assessments of electron and hole transfer dynamics with water on anatase nanocrystalline TiO2 films were conducted by employing a series of transient absorption spectrometers. For water reduction reactions, both conduction band and trapped electrons decay with two different single exponential components with the difference in time scale of 6∼7 orders of magnitudes. The faster reaction occurs in 8–16 ns, while the slower component shows a lifetime of 0.1∼1.4 s. Pt nanoparticle deposition on the TiO2 surface switches the slower single exponential reaction to a stretched exponential with an accelerated half lifetime of 2–7 ms, indicating that this slower reaction is limited by the electron... (More)

Quantitative assessments of electron and hole transfer dynamics with water on anatase nanocrystalline TiO2 films were conducted by employing a series of transient absorption spectrometers. For water reduction reactions, both conduction band and trapped electrons decay with two different single exponential components with the difference in time scale of 6∼7 orders of magnitudes. The faster reaction occurs in 8–16 ns, while the slower component shows a lifetime of 0.1∼1.4 s. Pt nanoparticle deposition on the TiO2 surface switches the slower single exponential reaction to a stretched exponential with an accelerated half lifetime of 2–7 ms, indicating that this slower reaction is limited by the electron trapping-detrapping movements inside the TiO2. Water oxidation reactions occur multi-exponentially from 100 ns to 200 ms with a half lifetime of 10 μs. Pt on the TiO2 surface catalyses water oxidation, occurring from 25 ns with a half lifetime of 8 μs.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Photocatalysis, TiO, Transient absorption spectroscopy, Water oxidation, Water reduction
in
Applied Catalysis B: Environmental
volume
296
article number
120226
publisher
Elsevier
external identifiers
  • scopus:85106925712
ISSN
0926-3373
DOI
10.1016/j.apcatb.2021.120226
language
English
LU publication?
no
id
80a96994-f431-4986-ba6f-251e74c4f472
date added to LUP
2023-08-24 12:27:42
date last changed
2023-08-25 14:54:22
@article{80a96994-f431-4986-ba6f-251e74c4f472,
  abstract     = {{<p>Quantitative assessments of electron and hole transfer dynamics with water on anatase nanocrystalline TiO<sub>2</sub> films were conducted by employing a series of transient absorption spectrometers. For water reduction reactions, both conduction band and trapped electrons decay with two different single exponential components with the difference in time scale of 6∼7 orders of magnitudes. The faster reaction occurs in 8–16 ns, while the slower component shows a lifetime of 0.1∼1.4 s. Pt nanoparticle deposition on the TiO<sub>2</sub> surface switches the slower single exponential reaction to a stretched exponential with an accelerated half lifetime of 2–7 ms, indicating that this slower reaction is limited by the electron trapping-detrapping movements inside the TiO<sub>2</sub>. Water oxidation reactions occur multi-exponentially from 100 ns to 200 ms with a half lifetime of 10 μs. Pt on the TiO<sub>2</sub> surface catalyses water oxidation, occurring from 25 ns with a half lifetime of 8 μs.</p>}},
  author       = {{Liu, Hanming and Liu, Maning and Nakamura, Ryosuke and Tachibana, Yasuhiro}},
  issn         = {{0926-3373}},
  keywords     = {{Photocatalysis; TiO; Transient absorption spectroscopy; Water oxidation; Water reduction}},
  language     = {{eng}},
  month        = {{11}},
  publisher    = {{Elsevier}},
  series       = {{Applied Catalysis B: Environmental}},
  title        = {{Primary photocatalytic water reduction and oxidation at an anatase TiO<sub>2</sub> and Pt-TiO<sub>2</sub> nanocrystalline electrode revealed by quantitative transient absorption studies}},
  url          = {{http://dx.doi.org/10.1016/j.apcatb.2021.120226}},
  doi          = {{10.1016/j.apcatb.2021.120226}},
  volume       = {{296}},
  year         = {{2021}},
}