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dc.contributor.authorJiang, DL
dc.contributor.authorZhao, HJ
dc.contributor.authorJia, ZB
dc.contributor.authorCao, JL
dc.contributor.authorJohn, R
dc.date.accessioned2017-05-03T13:33:29Z
dc.date.available2017-05-03T13:33:29Z
dc.date.issued2001
dc.date.modified2007-03-14T02:36:48Z
dc.identifier.issn1010-6030
dc.identifier.urihttp://hdl.handle.net/10072/3551
dc.description.abstractA study of photoelectrochemical oxidation of methanol at nanoporous TiO2 film electrodes was carried out. The effect of variables such as applied potential, light intensity, methanol concentration and pH on the photoelectrochemical behaviour was investigated. It was found that the photoresponse was greatly influenced by these factors and a unique photocurrent/potential characteristic of the electrode in solution was observed which was similar to that of the single crystal semiconductor electrode. It was also found that the rate-limiting step for the overall photooxidation process varied depending on potential, light intensity and methanol surface coverage. In low potential region at a given light intensity and methanol concentration the migration of electron across the TiO2 film is the rate-limiting step. While in the relatively high potential region the interfacial charge transfer was found to be the rate-limiting step. A deviation of onset potential dependence on pH from the Nernstian relationship was also observed, and based on the energy band theory and the existence of deep electron traps an explanation was given. An unusual abrupt increase of photocurrent in strong basic methanol solution was observed, which was attributed to the existence of acidic hydroxyl group on TiO2 and its stronger adsorption to methanol molecule after its reaction with OH-, and the higher reactivity of the methanol thus adsorbed.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherElsevier Science
dc.publisher.placeSwitzerland
dc.publisher.urihttp://www.elsevier.com/wps/find/journaldescription.cws_home/504091/description#description
dc.relation.ispartofpagefrom197
dc.relation.ispartofpageto204
dc.relation.ispartofjournalJournal of Photochemisty and Photobiology A : Chemistry
dc.relation.ispartofvolume144
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchEngineering
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode31
dc.subject.fieldofresearchcode40
dc.titlePhotoelectrochemical behaviour of methanol oxidation at nanoporous TiO2 film electrodes
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.rights.copyright© 2001 Elsevier : Reproduced in accordance with the copyright policy of the publisher : This journal is available online - use hypertext links.
gro.date.issued2001
gro.hasfulltextNo Full Text
gro.griffith.authorZhao, Huijun
gro.griffith.authorJohn, Richard


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