Open AccessPreparation of Porous F-WO3/TiO2Films with Visible-Light Photocatalytic Activity by Microarc Oxidation
Author(s) -
Chung-Wei Yeh,
Kee-Rong Wu,
Chung-Hsuang Hung,
HaoCheng Chang,
ChuanJen Hsu
Publication year - 2011
Publication title -
international journal of photoenergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.426
H-Index - 51
eISSN - 1687-529X
pISSN - 1110-662X
DOI - 10.1155/2012/285129
Subject(s) - materials science , photocatalysis , anatase , visible spectrum , microstructure , porosity , band gap , scanning electron microscope , absorbance , transmission electron microscopy , chemical engineering , electrolyte , irradiation , nanotechnology , optics , optoelectronics , composite material , catalysis , chemistry , electrode , nuclear physics , biochemistry , physics , engineering
Porous F-WO3/TiO2 (mTiO2) films are prepared on titanium sheet substrates using microarc oxidation (MAO) technique. The X-ray diffraction patterns show that visible-light (Vis) enabling mTiO2 films with a very high content of anatase TiO2 and high loading of WO3 are successfully synthesized at a low applied voltage of 300 V using electrolyte contenting NaF and Na2WO4 without subsequent heat treatment. The cross-sectional transmission electron microscopy micrograph reveals that the mTiO2 films feature porous networks connected by many micron pores. The diffused reflection spectrum displays broad absorbance across the UV-Vis regions and a significant red shift in the band gap energy (∼2.23 eV) for the mTiO2 film. Owing to the high specific surface area from the porous microstructure, the mTiO2 film shows a 61% and 50% rate increase in the photocatalytic dye degradation, as compared with the N,C-codoped TiO2 films under UV and Vis irradiation, respectively
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