A simple and low-cost method for the preparation of self-supported TiO<sub>2</sub>-WO<sub>3</sub> ceramic heterojunction wafers
Data(s) |
2014
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Resumo |
<p>Robust, bilayer heterojunction photodiodes of TiO<sub>2</sub>-WO<sub>3</sub> were prepared successfully by a simple, low-cost powder pressing technique followed by heat-treatment. Exclusive photoirradiation of the TiO<sub>2</sub> side of the photodiode resulted in a rapid colour change (dark blue) on the WO<sub>3</sub> surface as a result of reduction of W<sup>6+</sup> to W<sup>5+</sup> (confirmed by X-ray photoelectron spectroscopy). This colour was long lived and shown to be stable in a dry environment in air for several hours. A similar photoirradiation experiment in the presence of a mask showed that charge transfer across the heterojunction occurred approximately normal to the TiO<sub>2</sub> surface, with little smearing out of the mask image. As a result of the highly efficient vectorial charge separation, the photodiodes showed a tremendous increase in photocatalytic activity for the degradation of stearic acid, compared to wafers of the respective individual materials when tested separately.</p> |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Makwana , N M , Quesada-Cabrera , R , Parkin , I P , McMillan , P F , Mills , A & Darr , J A 2014 , ' A simple and low-cost method for the preparation of self-supported TiO 2 -WO 3 ceramic heterojunction wafers ' Journal of Materials Chemistry A , vol 2 , pp. 17602-17608, Impact Factor: 7.4 . DOI: 10.1039/c4ta03257h |
Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/1600 #Chemistry(all) #/dk/atira/pure/subjectarea/asjc/2100/2105 #Renewable Energy, Sustainability and the Environment #/dk/atira/pure/subjectarea/asjc/2500 #Materials Science(all) |
Tipo |
article |