Influence of the Metal Work Function on the Photocatalytic Properties of TiO2 Layers on Metals

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

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  • J. Freitag
  • D.W. Bahnemann

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OriginalspracheEnglisch
Seiten (von - bis)2670-2679
Seitenumfang10
FachzeitschriftCHEMPHYSCHEM
Jahrgang16
Ausgabenummer12
Frühes Online-Datum26 Juni 2015
PublikationsstatusVeröffentlicht - 17 Aug. 2015

Abstract

The photocatalytic properties of titanium dioxide (TiO 2) layers on different metal plates are investigated. The metal-semiconductor interface can be described as a Schottky contact, and is part of a depletion layer for the majority carriers in the semiconductor. Many researchers have demonstrated an increase in the photocatalytic activity, due to the formation of a metal-semiconductor contact that are obtained by deposition of small metal islands on the semiconductor. Nevertheless, the influence of a Schottky contact remains uncertain, sparking much interest in this field. The immobilization of nanoparticulate TiO 2 layers by dip-coating on different metal substrates results in the formation of a Schottky contact. The recombination rate of photoinduced electron-hole pairs decreases at this interface provided that the thickness of the thin TiO 2 layer has a similar magnitude to the depletion layer. The degradation of dichloroacetic acid in aqueous solution and of acetaldehyde in a gas mixture is investigated to obtain information concerning the influence of the metal work function of the back contact on the efficiency of the photocatalytic process. Green coat: The Schottky contacts at the interface between a semiconductor and a metal might form the basis for the detoxification of environmental pollutants. The photodegradation reaction of acetaldehyde and dichloroacetic acid is used to investigate the relationship between the metal work function and photocatalysis by TiO 2 layers dip-coated onto metal surfaces. A proposed degradation pathway of dichloroacetate at the solid-liquid interface is discussed.

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Influence of the Metal Work Function on the Photocatalytic Properties of TiO2 Layers on Metals. / Freitag, J.; Bahnemann, D.W.
in: CHEMPHYSCHEM, Jahrgang 16, Nr. 12, 17.08.2015, S. 2670-2679.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Freitag J, Bahnemann DW. Influence of the Metal Work Function on the Photocatalytic Properties of TiO2 Layers on Metals. CHEMPHYSCHEM. 2015 Aug 17;16(12):2670-2679. Epub 2015 Jun 26. doi: 10.1002/cphc.201500281
Freitag, J. ; Bahnemann, D.W. / Influence of the Metal Work Function on the Photocatalytic Properties of TiO2 Layers on Metals. in: CHEMPHYSCHEM. 2015 ; Jahrgang 16, Nr. 12. S. 2670-2679.
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