Photoelectrochemical Behavior of Alizarin Modified TiO2 Films

Photocurrent voltage curves obtained under visible light excitation of alizarin molecules chemisorbed to nanoporous TiO2 films show both anodic and cathodic currents. The potential at which the sign reversal occurs depends on the electrolyte pH, the presence of acceptors, and the dye coverage, but a...

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Published in:Journal of physical chemistry. C 2010-07, Vol.114 (26), p.11515-11521
Main Authors: Di Iorio, Yesica, Rodríguez, Hernán B, San Román, Enrique, Grela, María A
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Language:English
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C: Surfaces, Interfaces, Catalysis
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creator Di Iorio, Yesica
Rodríguez, Hernán B
San Román, Enrique
Grela, María A
description Photocurrent voltage curves obtained under visible light excitation of alizarin molecules chemisorbed to nanoporous TiO2 films show both anodic and cathodic currents. The potential at which the sign reversal occurs depends on the electrolyte pH, the presence of acceptors, and the dye coverage, but as a general rule, it occurs at potentials ca. 600−700 mV more positive than the flat band potential. Negative photocurrents are accounted by efficient electron discharge to the electrolyte mediated by the ligand. Cathodic photocurrents are only observed at pH values higher than ca. 4.0 and go through a maximum at intermediate alizarin loadings. This phenomenon is ascribed to the progressive reparation of surface states by alizarin which hampers carrier transport through the TiO2 matrix and decreases electron discharge to the electrolyte solution.
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title Photoelectrochemical Behavior of Alizarin Modified TiO2 Films
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