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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2010
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| LEADER | 10041caa a22012497a 4500 | ||
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| 001 | PAPER-7763 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203732.0 | ||
| 008 | 190411s2010 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-77954257840 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Di Iorio, Y. | |
| 245 | 1 | 0 | |a Photoelectrochemical behavior of alizarin modified TiO2 films |
| 260 | |c 2010 | ||
| 270 | 1 | 0 | |m Grela, M. A.; Departamento de Química, Universidad Nacional de Mar Del Plata, Funes 3350, B7602AYL Mar del Plata, Argentina; email: magrela@mdp.edu.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a 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. © 2010 American Chemical Society. |l eng | |
| 593 | |a Departamento de Química, Universidad Nacional de Mar Del Plata, Funes 3350, B7602AYL Mar del Plata, Argentina | ||
| 593 | |a INQUIMAE, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, 1428 Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a CATHODIC CURRENTS |
| 690 | 1 | 0 | |a CATHODIC PHOTOCURRENT |
| 690 | 1 | 0 | |a ELECTROLYTE SOLUTIONS |
| 690 | 1 | 0 | |a ELECTRON DISCHARGE |
| 690 | 1 | 0 | |a FLAT BAND POTENTIAL |
| 690 | 1 | 0 | |a MATRIX |
| 690 | 1 | 0 | |a NANOPOROUS TIO |
| 690 | 1 | 0 | |a PH VALUE |
| 690 | 1 | 0 | |a PHOTOCURRENT-VOLTAGE CURVE |
| 690 | 1 | 0 | |a PHOTOELECTROCHEMICAL BEHAVIOR |
| 690 | 1 | 0 | |a SIGN REVERSAL |
| 690 | 1 | 0 | |a SURFACE STATE |
| 690 | 1 | 0 | |a TIO |
| 690 | 1 | 0 | |a VISIBLE LIGHT EXCITATION |
| 690 | 1 | 0 | |a CHEMISORPTION |
| 690 | 1 | 0 | |a PHOTOCURRENTS |
| 690 | 1 | 0 | |a SEMICONDUCTOR QUANTUM WELLS |
| 690 | 1 | 0 | |a ELECTROLYTES |
| 700 | 1 | |a Rodríguez, H.B. | |
| 700 | 1 | |a San Román, E. | |
| 700 | 1 | |a Grela, M.A. | |
| 773 | 0 | |d 2010 |g v. 114 |h pp. 11515-11521 |k n. 26 |p J. Phys. Chem. C |x 19327447 |t Journal of Physical Chemistry C | |
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| 856 | 4 | 0 | |u https://doi.org/10.1021/jp102354m |y DOI |
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