Control of Methylene Blue Photo-Oxidation Rate over Polycrystalline Anatase TiO2 Thin Films via Carrier Concentration

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§ Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
Institute of Chemical and Engineering Sciences, Jurong Island, Singapore 627833, Singapore
Nanyang Technological University, Singapore, Singapore 639798, Singapore
Cite this: J. Phys. Chem. C 2015, 119, 21, 11662–11671
Publication Date (Web):April 28, 2015
https://doi.org/10.1021/acs.jpcc.5b01852
Copyright © 2015 American Chemical Society
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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.

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