Control of methylene blue photo-oxidation rate over polycrystalline anatase TiO2 thin films via carrier concentration

S. W.Daniel Ong, Jianyi Lin, Edmund G. Seebauer

Research output: Contribution to journalArticle

Abstract

Reaction rates on photocatalytic surfaces would often benefit greatly if minority photocarriers could be driven more efficiently to the surface through the manipulation of electric fields within the semiconductor. Such field-induced manipulation of photocurrent is commonplace in conventional optoelectronics, but translation to photochemistry and photoelectrochemistry has lagged. The present work demonstrates quantitatively that manipulation of the spatial extent of band-bending via background carrier concentration can increase photoreaction rates by a factor of 5 or more in the case of methylene blue photodegradation over thin-film polycrystalline anatase TiO2. A quantitative photocurrent model fits closely to experimental rate data with no adjustable parameters.

Original languageEnglish (US)
Pages (from-to)11662-11671
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number21
DOIs
StatePublished - May 28 2015

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ASJC Scopus subject areas

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

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