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Abstract:

The electrokinetics of chromium-modified passive iron electrodes in alkaline chromate solutions are reported. Cyclic voltammetric studies at different pHs, chromate concentrations and temperatures have shown two different types of pseudocapacitive behaviour: the reductive precipitation of hydrous Cr(III) species on the top of the iron passive layer and redox transformations of chromium ions entrapped in the passive film matrix. The latter process has been analysed in terms of a thin layer redox-modified electrode model. A simple kinetic behaviour for the multi-electron Cr(VI)/Cr(III) reduction with a Cr(VI)/Cr(V) rate-de-termining step involving a protonation step is apparent with a Tafel-type temperature dependence. The electrochemical results are discussed in connection with XPS chromium concentration-depth profiles in the modified surface matrix. © 1988.

Registro:

Documento: Artículo
Título:Electrokinetics of the reduction of chromium(VI) ions entrapped in chromium-modified passive iron electrodes
Autor:Pallotta, C.D.; Gonnet, R.; Calvo, E.J.
Filiación:Facultad de Ciencias Exactas y Naturales, Departamento de Quimica Inorganica, Analitica y Quimica Fisica, Ciudad Universitaria, Pab. II, (1428) Buenos AiresArgentina
Institute Nacional de Tecnologia Industrial (INTI), Sector Electroquimica Aplicada, c.c. 157 San Martin, (1650) Buenos AiresArgentina
Año:1988
Volumen:241
Número:1-2
Página de inicio:265
Página de fin:279
DOI: http://dx.doi.org/10.1016/0022-0728(88)85130-1
Título revista:Journal of Electroanalytical Chemistry
Título revista abreviado:J Electroanal Chem
ISSN:00220728
CODEN:JECHE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00220728_v241_n1-2_p265_Pallotta

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Citas:

---------- APA ----------
Pallotta, C.D., Gonnet, R. & Calvo, E.J. (1988) . Electrokinetics of the reduction of chromium(VI) ions entrapped in chromium-modified passive iron electrodes. Journal of Electroanalytical Chemistry, 241(1-2), 265-279.
http://dx.doi.org/10.1016/0022-0728(88)85130-1
---------- CHICAGO ----------
Pallotta, C.D., Gonnet, R., Calvo, E.J. "Electrokinetics of the reduction of chromium(VI) ions entrapped in chromium-modified passive iron electrodes" . Journal of Electroanalytical Chemistry 241, no. 1-2 (1988) : 265-279.
http://dx.doi.org/10.1016/0022-0728(88)85130-1
---------- MLA ----------
Pallotta, C.D., Gonnet, R., Calvo, E.J. "Electrokinetics of the reduction of chromium(VI) ions entrapped in chromium-modified passive iron electrodes" . Journal of Electroanalytical Chemistry, vol. 241, no. 1-2, 1988, pp. 265-279.
http://dx.doi.org/10.1016/0022-0728(88)85130-1
---------- VANCOUVER ----------
Pallotta, C.D., Gonnet, R., Calvo, E.J. Electrokinetics of the reduction of chromium(VI) ions entrapped in chromium-modified passive iron electrodes. J Electroanal Chem. 1988;241(1-2):265-279.
http://dx.doi.org/10.1016/0022-0728(88)85130-1