Photocatalytic H2 evolution over TiO2 nanoparticles. The synergistic effect of anatase and rutile

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yung Kent Kho
  • Akihide Iwase
  • Lutz Mädler
  • Akihiko Kudo
  • Rose Amal

Detail(s)

Original languageEnglish
Pages (from-to)2821-2829
Journal / PublicationJournal of Physical Chemistry C
Volume114
Issue number6
Publication statusPublished - 18 Feb 2010
Externally publishedYes

Abstract

Photocatalytic H2 evolution over aqueous TiO2 suspension, with methanol as holes scavenger, is systematically studied as a function of anatase and rutile phase compositions. The highly crystalline, flame-synthesized TiO2 nanoparticles (22-36 m2 g -1) were designed to contain 4-95 mol % anatase, with the remaining being rutile. Although the amount of photocurrent generated under applied potential bias increases with increasing anatase content, a different trend was observed during photocatalytic H2 evolution in suspension form; that is, without potential bias. Here, synergistic effects in terms of H2 evolution were observed for a wide range of anatase contents, from 13 to 79 mol %. At the optimal 39 mol % anatase, the photocatalytic activity was enhanced by more than a factor of 2 with respect to the anatase- and rutile-rich phases. The synergistic effect in these mixed anatase-rutile phases was thought to originate from the efficient charge separation across phase junctions. No synergistic effect was observed for the physically mixed anatase and rutile particles due to insufficient physical contact. Here, we also identify the formation of highly reducing hydroxymethyl radicals during the simultaneous oxidation of methanol, which efficiently inject additional electrons into the TiO2 conduction band, that is, current-doubling, for heterogeneous (instead of homogeneous) H2 evolution. © 2010 American Chemical Society.

Citation Format(s)

Photocatalytic H2 evolution over TiO2 nanoparticles. The synergistic effect of anatase and rutile. / Kho, Yung Kent; Iwase, Akihide; Teoh, Wey Yang et al.
In: Journal of Physical Chemistry C, Vol. 114, No. 6, 18.02.2010, p. 2821-2829.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review