Details
| Original language | English |
|---|---|
| Pages (from-to) | 596-599 |
| Number of pages | 4 |
| Journal | Physica Status Solidi - Rapid Research Letters |
| Volume | 8 |
| Issue number | 6 |
| Early online date | 15 May 2014 |
| Publication status | Published - 20 Jun 2014 |
Abstract
The photocatalytic properties of titanium dioxide layers on metal sheets prepared via cold gas spraying have been investigated employing the ISO 22197-2 standard test for acetaldehyde degradation in the gas phase. The contact between the TiO 2 and the metal substrate can be described as a Schottky contact. A depletion region is formed at the semiconductor-metal interface leading to an enhanced separation of the photoinduced charge carriers. Thus, the lifetime of the e -/h + pair is prolonged. The variation of process parameters, such as temperature and pressure, during the CGS preparation leads to different photocatalytic properties of the obtained TiO 2 layers. Under high pressure and temperature even visible light active TiO 2 coatings are prepared. The CGS technique allows the formation of thin TiO 2 films without any binders exhibiting high photocatalytic activities in the same range as the pure powders employed for their preparation. Schematic diagram presenting the Schottky contact of an n-type semiconductor and met al. E f is the Fermi level, VB and CB are the valence and conduction band of the semiconductor, respectively. A proposed degradation pathway of acet-aldehyde at the solid/gas interface is depicted. (
Keywords
- Acetaldehyde degradation, Cold gas spraying, Photocatalysis, Titanium dioxides, Visible-light activity
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physica Status Solidi - Rapid Research Letters, Vol. 8, No. 6, 20.06.2014, p. 596-599.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evaluation of the photocatalytic (visible-light) activity of cold gas sprayed TiO2 layers on metal sheets
AU - Freitag, J.
AU - Bahnemann, D.W.
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/6/20
Y1 - 2014/6/20
N2 - The photocatalytic properties of titanium dioxide layers on metal sheets prepared via cold gas spraying have been investigated employing the ISO 22197-2 standard test for acetaldehyde degradation in the gas phase. The contact between the TiO 2 and the metal substrate can be described as a Schottky contact. A depletion region is formed at the semiconductor-metal interface leading to an enhanced separation of the photoinduced charge carriers. Thus, the lifetime of the e -/h + pair is prolonged. The variation of process parameters, such as temperature and pressure, during the CGS preparation leads to different photocatalytic properties of the obtained TiO 2 layers. Under high pressure and temperature even visible light active TiO 2 coatings are prepared. The CGS technique allows the formation of thin TiO 2 films without any binders exhibiting high photocatalytic activities in the same range as the pure powders employed for their preparation. Schematic diagram presenting the Schottky contact of an n-type semiconductor and met al. E f is the Fermi level, VB and CB are the valence and conduction band of the semiconductor, respectively. A proposed degradation pathway of acet-aldehyde at the solid/gas interface is depicted. (
AB - The photocatalytic properties of titanium dioxide layers on metal sheets prepared via cold gas spraying have been investigated employing the ISO 22197-2 standard test for acetaldehyde degradation in the gas phase. The contact between the TiO 2 and the metal substrate can be described as a Schottky contact. A depletion region is formed at the semiconductor-metal interface leading to an enhanced separation of the photoinduced charge carriers. Thus, the lifetime of the e -/h + pair is prolonged. The variation of process parameters, such as temperature and pressure, during the CGS preparation leads to different photocatalytic properties of the obtained TiO 2 layers. Under high pressure and temperature even visible light active TiO 2 coatings are prepared. The CGS technique allows the formation of thin TiO 2 films without any binders exhibiting high photocatalytic activities in the same range as the pure powders employed for their preparation. Schematic diagram presenting the Schottky contact of an n-type semiconductor and met al. E f is the Fermi level, VB and CB are the valence and conduction band of the semiconductor, respectively. A proposed degradation pathway of acet-aldehyde at the solid/gas interface is depicted. (
KW - Acetaldehyde degradation
KW - Cold gas spraying
KW - Photocatalysis
KW - Titanium dioxides
KW - Visible-light activity
UR - http://www.scopus.com/inward/record.url?scp=84902653585&partnerID=8YFLogxK
U2 - 10.1002/pssr.201409098
DO - 10.1002/pssr.201409098
M3 - Article
VL - 8
SP - 596
EP - 599
JO - Physica Status Solidi - Rapid Research Letters
JF - Physica Status Solidi - Rapid Research Letters
SN - 1862-6254
IS - 6
ER -