Dynamics of photo-processes at the n-TiO2 aqueous electrolyte interface

DJ Fermin, EA Ponomarev, LM Peter

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

The kinetics of photo-oxidation of water on single crystal n-TiO2 electrodes has been studied by intensity modulated photocurrent spectroscopy (IMPS). Analysis of the data indicates a mechanism involving hydroxyl radicals (. OHg) that are consumed (if by reacting with other mobile . OHg radicals or (ii) by trapping an electron from the conduction band. Both reactions are slow. Photocurrent doubling and suppression of surface recombination were observed in solutions containing formic acid or methanol. The photocurrent doubling ratio increased with increasing illumination intensity, ruling out the generally accepted mechanism in which electron injection competes with hole capture. It is concluded that the photo-oxidation process is mediated by photogenerated OH radicals.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE SYMPOSIUM ON PHOTOELECTROCHEMISTRY
EditorsK Rajeshwar, LM Peter, A Fujishima, D Meissner, M Tomkiewich
Place of PublicationPENNINGTON
PublisherThe Electrochemical Society, Inc
Pages62-71
Number of pages10
ISBN (Print)1-56677-148-X
Publication statusPublished - 1997
EventSymposium on Photoelectrochemistry, at the 1997 Joint Meeting of the Electrochemical-Society / International-Society-of-Electrochemistry - PARIS, France
Duration: 1 Jan 1997 → …

Publication series

NameELECTROCHEMICAL SOCIETY SERIES
PublisherELECTROCHEMICAL SOCIETY INC
Volume97

Conference

ConferenceSymposium on Photoelectrochemistry, at the 1997 Joint Meeting of the Electrochemical-Society / International-Society-of-Electrochemistry
CountryFrance
Period1/01/97 → …

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