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Abstract:

The photo-electro-oxidation on titanium dioxide film electrodes of methanol, 2-propanol, and tert-butyl alcohol has been studied by measuring the transient photocurrents observed during the early stages of illumination. Transients and steady-state photocurrents, measured at different applied potentials and methanol concentrations, were compared with model predictions. The numerical solution of the differential equations corresponding to methanol photo-electro-oxidation, as well as the advanced experimental evidence, supports the hypothesis that surface hole trapping as -OH . mediates the charge transfer to methanol. Formation of -OH . accounts for the high initial photocurrents, its rapid decay being due to recombination. The rate of oxidation of methanol is then determined by the rate of reaction between -OH . and CH 3 OH located in the interfacial region. The oxidation of . CH 2 OH to CH 2 O, through the injection of an electron into the conduction band (current doubling), gives rise to an increase in photocurrent; steady state values are later attained. As a consequence, a minimum transient is observed. The minimum is marginally observable in tert-butyl alcohol solutions, in line with the properties of the respective radicals. © 1999 American Chemical Society.

Registro:

Documento: Artículo
Título:Photo-electro-oxidation of alcohols on titanium dioxide thin film electrodes
Autor:Mandelbaum, P.A.; Regazzoni, A.E.; Blesa, M.A.; Bilmes, S.A.
Filiación:INQUIMAE-DQIAQF, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Unidad de Actividad Química, Comisión Nacional de Energía Atómica, Avenida del Libertador 8250, 1429 Buenos Aires, Argentina
Año:1999
Volumen:103
Número:26
Página de inicio:5505
Página de fin:5511
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:10895647
CODEN:JPCBF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n26_p5505_Mandelbaum

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Citas:

---------- APA ----------
Mandelbaum, P.A., Regazzoni, A.E., Blesa, M.A. & Bilmes, S.A. (1999) . Photo-electro-oxidation of alcohols on titanium dioxide thin film electrodes. Journal of Physical Chemistry B, 103(26), 5505-5511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n26_p5505_Mandelbaum [ ]
---------- CHICAGO ----------
Mandelbaum, P.A., Regazzoni, A.E., Blesa, M.A., Bilmes, S.A. "Photo-electro-oxidation of alcohols on titanium dioxide thin film electrodes" . Journal of Physical Chemistry B 103, no. 26 (1999) : 5505-5511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n26_p5505_Mandelbaum [ ]
---------- MLA ----------
Mandelbaum, P.A., Regazzoni, A.E., Blesa, M.A., Bilmes, S.A. "Photo-electro-oxidation of alcohols on titanium dioxide thin film electrodes" . Journal of Physical Chemistry B, vol. 103, no. 26, 1999, pp. 5505-5511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n26_p5505_Mandelbaum [ ]
---------- VANCOUVER ----------
Mandelbaum, P.A., Regazzoni, A.E., Blesa, M.A., Bilmes, S.A. Photo-electro-oxidation of alcohols on titanium dioxide thin film electrodes. J Phys Chem B. 1999;103(26):5505-5511.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n26_p5505_Mandelbaum [ ]