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Evaluating Pt-Ru/C mixtures as ethanol electro-oxidation catalyzers
Evaluación de mezclas Pt-Ru/C como catalizadores de la electro-oxidación de etanol
DOI:
https://doi.org/10.15446/ing.investig.v24n3.14611Keywords:
ethanol oxidation, electro-catalysis, platinum.rutenium anodes (en)oxidación de etanol, electro catálisis, ánodos de platino rutenio (es)
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This work studies ethanol electro-catalytic oxidation by cyclic voltammetry in sulphuric acid solutions at different temperatures and concentrations, using platinum-rutenium mixtures supported in vitreous carbon as catalyzers. The results indicate that ethanol oxidation in these electrodes is irreversible, has slow kinetics, is controlled by charge transfer and is brought about by a bi-functional reaction mechanism, this being ethanol adsorption on platinum atoms and additional oxidation of species adsorbed in the presence of platinum and ruthenium oxides. Experimental results show increased catalytic activity with Pt92 Ru8 and Pt85 Ru15 electrodes, followed by reduced activity for electrodes having a greater quantity of ruthenium.
En este trabajo se estudia, mediante la técnica de voltametría cíclica, la oxidación electro-catalítica de etanol en soluciones de ácido sulfúrico a diferentes temperaturas y concentraciones utilizando como catalizadores mezclas de platino-rutenio soportadas en carbón vítreo. Los resultados indican que la oxidación de etanol en estos electrodos es irreversible, de cinética lenta, está controlada por la transferencia de carga y se lleva a cabo mediante un mecanismo de reacción bi-funcional: Adsorción de etanol sobre los átomos de platino y oxidación adicional de las especies adsorbidas en presencia de óxidos de platino y rutenio. Los resultados experimentales muestran un aumento en la actividad catalítica con los electrodos Pt92 Ru8 y Pt85 Ru15 y una posterior disminución en la actividad para electrodos con cantidades mayores de rutenio.
References
Burstein, G. T. “Aspects of the Anodic Oxidation of Methanol” Catalysis Today, Vol. 38, pp. 425-437, 1997. DOI: https://doi.org/10.1016/S0920-5861(97)00107-7
Fujiwara, F; K. A. Friedrich, and U. Stimming, “Ethanol Oxidation on PtRu Electrodes Studied by Differential Electrochemical Mass Spectrometry”, J. Electroanal. Chem, Vol. 472, pp. 120-125, 1999. DOI: https://doi.org/10.1016/S0022-0728(99)00282-X
Hoyos, B.; C. Sanchez y J. González, “Caracterización de catalizadores de Pt-Ru/C por electrodesorción de H, Dyna, Vol. 71, No. 141, pp. 29-34, 2004.
Ianniello, R., V. M. Schmidt, J. L. Rodriguez and E. Pastor. “Electrochemical Surface Reaction of Intermediates formed in the Oxidative Ethanol Adsorption on Porous Pt and PtRu”, J. Electroanal. Chem. Vol. 471, pp. 167-179, 1999. DOI: https://doi.org/10.1016/S0022-0728(99)00273-9
Iwasita, T.; Rasch, B.; Cattaneo, E. and Vielstch, W. “A SNIFTIRS study of ethanol oxidation on platinum”, Electrochimica Acta, Vol. 34, pp. 1073 - 1079, 1989. DOI: https://doi.org/10.1016/0013-4686(89)87139-7
Lamy, C.; Belgsir, E. and Léger, J-M., “Electrocatalytic oxidation of aliphatic alcohols: Application to the direct alcohol fuel cell”, Journal of Applied Electrochemistry, Vol. 31, pp. 799 - 809, 2001. DOI: https://doi.org/10.1023/A:1017587310150
Nicholson, R. S. and I. Shain, “Theory of Stationary Electrode Polarography”, Analytical Chemistry. Vol. 36, No. 4, pp. 706 - 723, 1964. DOI: https://doi.org/10.1021/ac60210a007
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1. Justo Lobato, Pablo Cañizares, Diego Ubeda, Francisco J. Pinar, Manuel A. Rodrigo. (2011). Testing PtRu/CNF catalysts for a high temperature polybenzimidazole-based direct ethanol fuel cell. Effect of metal content. Applied Catalysis B: Environmental, https://doi.org/10.1016/j.apcatb.2011.05.022.
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Copyright (c) 2004 Bibian Alonso Hoyos, Javier González, Carlos Sánchez
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