NDLI: Photoelectrocatalytic activity of mesoporous TiO$_{2}$ films prepared using the sol–gel method with tri-block copolymer as structure directing agent

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Photoelectrocatalytic activity of mesoporous TiO$_{2}$ films prepared using the sol–gel method with tri-block copolymer as structure directing agent

Content Provider	Springer Nature Link
Author	Gan, W. Y. Lee, M. W. Amal, R. Zhao, H. Chiang, K.
Copyright Year	2008
Abstract	Mesoporous TiO$_{2}$ films were synthesized using a sol–gel process with a tri-block copolymer (Pluronic F127) as a structure directing agent. The films were dip-coated onto conductive glass substrates followed by thermal treatment to remove the polymeric surfactant. The specific surface area, the pore size and morphology, and the crystallinity of the films were characterized. The analysis showed the structural properties of the films could be tailored by varying the surfactant concentration as well as the annealing temperature. The photocurrent responses of the prepared films were measured using a three-electrode photoelectrochemical cell in the presence of oxalic acid. When annealed at 450 °C, the dense electrode (control sample) had the strongest photoelectrocatalytic oxidation aptitude toward oxalic acid. The lower photocurrent response of the mesoporous electrodes compared to the dense electrode can be explained by poor inter-particle connectivity within the mesoporous TiO$_{2}$ network, leading to high electron transport resistance. The mesoporous electrode annealed at 550 °C, with improved connectivity, outperformed the dense electrode at a high oxalic concentration, as the lower surface area of the dense electrode restricted photoelectrocatalysis reactions on the surface. A further increase in annealing temperature to 650 °C resulted in a poor photocurrent response as the significant decrease in surface area outweighed the beneficial effect of improved connectivity.
Starting Page	703
Ending Page	712
Page Count	10
File Format	PDF
ISSN	0021891X
Journal	Journal of Applied Electrochemistry
Volume Number	38
Issue Number	5
e-ISSN	15728838
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-02-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$ film Mesoporous Photoelectrocatalytic oxidation Oxalic acid Industrial Chemistry/Chemical Engineering Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Chemical Engineering Electrochemistry

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