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Observation of an optical phonon band in situ in TiO₂ electrochemistry: A possible indicator of strongly trapped intermediates in the O₂ evolution reaction

Lookup NU author(s): Professor Paul ChristensenORCiD, Dr Andrew Hamnett, Professor Wen-Feng Lin

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Abstract

This Letter reports in situ Fourier transform infrared (FTIR) spectroscopic data on thermal TiO2 films fabricated by heating titanium plates in air at 475, 700 and 800 °C. The films were studied in the dark and under UV-irradiation in aqueous 0.1MNaClO4 in the presence and absence of 0.1 M Na2(OOC)2 and at 10, 25 and 50 °C. The film fabricated at 800 °C showed a broad feature near 1580cm-1 under UV-irradiation that was not observed in the dark, whilst the films fabricated at lower temperatures, 475 and 700 °C, showed no such feature. This feature appears to be associated with the accumulation of surface-mobile holes at the complex, porous film-electrolyte interface and the capacity of such holes to enhance the absorption cross-section of optical phonons characteristic of the rutile crystal form at and near the surface of the TiO2/electrolyte interface. © 2001 Elsevier Science B.V.

Publication metadata

Author(s): Lin WF; Christensen PA; Hamnett A; Eameaim J

Publication type: Article

Publication status: Published

Journal: Chemical Physics Letters

Year: 2001

Volume: 344

Issue: 5-6

Pages: 488-494

ISSN (print): 0009-2614

ISSN (electronic): 1873-4448

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/S0009-2614(01)00833-8

DOI: 10.1016/S0009-2614(01)00833-8

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