Comparative assessment of the efficiency of TiO2/OTE thin film electrodes fabricated by three deposition methods - Photoelectrochemical degradation of the DBS anionic surfactant

Citation
H. Hidaka et al., Comparative assessment of the efficiency of TiO2/OTE thin film electrodes fabricated by three deposition methods - Photoelectrochemical degradation of the DBS anionic surfactant, J PHOTOCH A, 138(2), 2001, pp. 185-192
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
ISSN journal
1010-6030 → ACNP
Volume
138
Issue
2
Year of publication
2001
Pages
185 - 192
Database
ISI
SICI code
1010-6030(20010115)138:2<185:CAOTEO>2.0.ZU;2-6
Abstract
This study reports on a comparative assessment of the efficiencies of TiO2/ SnO2-doped OTE thin film electrodes fabricated by three different depositio n methods. Process efficiencies, as measured by the kinetics of degradation , were examined by monitoring the photo-oxidative fate of two test substrat es, namely the anionic surfactant sodium dodecylbenzenesulfonate (DBS) and the model compound sodium benzenesulfonate (BS). Methods chosen to fabricat e the TiO2/OTE electrodes comprised (i) pulsed laser deposition, (ii) depos ition of a TiO2 paste on the OTE plate, and (iii) sol-gel deposition. Both DBS and BS are readily photo-oxidized and, under our conditions, were parti ally mineralized to CO2 with the process being made particularly more effic ient when the TiO2/OTE electrodes were anodically biased at +0.3 V, which g enerated a photocurrent during the photoelectrolysis. The sol-gel {C} and a natase {B1} electrodes proved especially useful under the +0.3 V bias. In t he absence of any bias, however, DBS photodegraded faster on the TiO2-paste d electrode. Under otherwise similar conditions, the pulsed laser rutile Ti O2/OTE electrode showed very little photoactivity. Some of the characterist ics of the TiO2 film, such as the TiO2 crystalline form, film thickness, su rface roughness, and film transparency appear to have some effect on the ov erall photodegradative process efficiency. (C) 2001 Elsevier Science B.V. A ll rights reserved.