Quantitative Measurements of Photocatalytic CO-Oxidation as a Function of Light Intensity and Wavelength over TiO2 Nanotube Thin Films in mu-Reactors

Peter Christian Kjærgaard Vesborg, Su-il In, Jacob L. Olsen, Toke Riishøj Henriksen, Billie Abrams, Yidong Hou, Alan Kleiman-Shwarsctein, Ole Hansen, Ib Chorkendorff

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Gas-phase photooxidation of CO over TiO2 catalysts (P25 and TiO2 nanotubes) in mu-reactors with quantitative product detection was used to study turnover as a function of illumination intensity over 4 orders of magnitude. Turnover was found to be of order 0.84 in illumination intensity. A CO photooxidation action spectrum was also recorded for TiO2 nanotubes. The action spectrum was used to calculate both the incident photon to product efficiency (IPPE) and the absorbed photon to product efficiency (APPE). The wavelength dependence of the IPPE was found to follow the absorption spectrum while the APPE was found to have a peak around 345 nm with a value of about 0.8%.
Original languageEnglish
JournalJournal of Physical Chemistry Part C: Nanomaterials and Interfaces
Volume114
Issue number25
Pages (from-to)11162-11168
ISSN1932-7447
DOIs
Publication statusPublished - 2010

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