Correlation between Photocatalytic Activity and Carrier Lifetime: Acetic Acid on Single-Crystal Surfaces of Anatase and Rutile TiO2

Kenichi Ozawa, Susumu Yamamoto, Ryu Yukawa, Ro Ya Liu, Naoya Terashima, Yuto Natsui, Hiroo Kato, Kazuhiko Mase, Iwao Matsuda

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Photocatalytic activity and lifetime of photoexcited carriers on well-defined single-crystalline anatase and rutile TiO2 surfaces with different surface orientation have been systematically studied by photoelectron spectroscopy. Photocatalytic activity, evaluated with reference to the photocatalytic degradation of acetic acid, has a positive and linear correlation with carrier lifetime at the crystal surface, which was determined by following the time evolution of the ultraviolet-induced surface photovoltage. This indicates that the carrier lifetime is a prime factor for the photocatalytic activity so that it can be viewed as the origin of the crystal-surface-orientation dependence of the photocatalytic activity.

Original languageEnglish
Pages (from-to)9562-9569
Number of pages8
JournalJournal of Physical Chemistry C
Volume122
Issue number17
DOIs
Publication statusPublished - 2018 May 3
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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