Photoelectrochemical oxidation of methanol on oxide nanosheets

Kazuyoshi Izawa, Takashi Yamada, Ugur Unal, Shintaro Ida, Ozge Altuntasoglu, Michio Koinuma, Yasumichi Matsumoto

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Photoelectrochemical oxidation of alcohol on various nanosheet electrodes such as Nb6O17, Ca2Nb3O 10, Ti0.91O2, Ti4O9, and MnO2 system host layers were measured to evaluate the photocatalysis of water photolysis with alcohol as a sacrificial agent. The nanosheet electrodes were prepared by the layer-by-layer (LBL) method, using electrostatic principles. The highest photooxidation current density was observed in methanol solution for Nb6O17 and Ca2Nb 3O10 nanosheets, while the density was lower for Ti 0.91O2, Ti4U9, and MnO2 nanosheets in decreasing order. The rank in the photocurrent density was in agreement with that in the photocatalytic activity, which means that the degree of photooxidation of the alcohol determines the activity of the alcohol in the water photolysis process. The photocurrent was independent of the number of nanosheet layers on the electrode, indicating that only the mono-nanosheet layer attached directly on a substrate acts as a photoelectrocatalyst and that the interlayer space is not important. Consequently, higher photooxidation current on the Nb6O17 mono-nanosheet layer means that the charge separation of electron and hole under illumination is very large and that the hole-capturing process by CH3OH is very quick compared with the surface recombination on the Nb6O17 nanosheet. The adsorption of a transition metal cation on the nanosheet acted as the surface recombination center, because the photocurrent decreased after the adsorption. The photocatalytic mechanism has been discussed in detail in terms of various photoelectrochemical behaviors.

Original languageEnglish
Pages (from-to)4645-4650
Number of pages6
JournalJournal of Physical Chemistry B
Volume110
Issue number10
DOIs
Publication statusPublished - Mar 16 2006

Fingerprint

Nanosheets
Oxides
Methanol
methyl alcohol
Alcohols
Oxidation
Electrodes
oxidation
oxides
photooxidation
Photolysis
alcohols
Genetic Recombination
Adsorption
photocurrents
Photooxidation
Photocurrents
electrodes
photolysis
Water

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Izawa, K., Yamada, T., Unal, U., Ida, S., Altuntasoglu, O., Koinuma, M., & Matsumoto, Y. (2006). Photoelectrochemical oxidation of methanol on oxide nanosheets. Journal of Physical Chemistry B, 110(10), 4645-4650. https://doi.org/10.1021/jp056210l

Photoelectrochemical oxidation of methanol on oxide nanosheets. / Izawa, Kazuyoshi; Yamada, Takashi; Unal, Ugur; Ida, Shintaro; Altuntasoglu, Ozge; Koinuma, Michio; Matsumoto, Yasumichi.

In: Journal of Physical Chemistry B, Vol. 110, No. 10, 16.03.2006, p. 4645-4650.

Research output: Contribution to journalArticle

Izawa, K, Yamada, T, Unal, U, Ida, S, Altuntasoglu, O, Koinuma, M & Matsumoto, Y 2006, 'Photoelectrochemical oxidation of methanol on oxide nanosheets', Journal of Physical Chemistry B, vol. 110, no. 10, pp. 4645-4650. https://doi.org/10.1021/jp056210l
Izawa K, Yamada T, Unal U, Ida S, Altuntasoglu O, Koinuma M et al. Photoelectrochemical oxidation of methanol on oxide nanosheets. Journal of Physical Chemistry B. 2006 Mar 16;110(10):4645-4650. https://doi.org/10.1021/jp056210l
Izawa, Kazuyoshi ; Yamada, Takashi ; Unal, Ugur ; Ida, Shintaro ; Altuntasoglu, Ozge ; Koinuma, Michio ; Matsumoto, Yasumichi. / Photoelectrochemical oxidation of methanol on oxide nanosheets. In: Journal of Physical Chemistry B. 2006 ; Vol. 110, No. 10. pp. 4645-4650.
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