Influence of activated carbon porous texture on catalyst activity for ethanol electro-oxidation

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Título

Influence of activated carbon porous texture on catalyst activity for ethanol electro-oxidation

Tema

CATALISIS
ETANOL
CARBON ACTIVADO
BIBLIOGRAFIA NACIONAL QUIMICA
2014

Abstract

Direct ethanol fuel cells are based in ethanol electro-oxidation at low temperature and they constitute an alternative energy conversion system. However, they need catalysts in order to improve their efficiency, given that ethanol electro-oxidation is a slow-kinetic reaction. Among those catalysts platinum and platinum alloys play an important role in the increase of the ethanol cleavage kinetics for fuel cell application. However, to maximize the catalyst performance, support materials are needed in order to reduce the catalyst load considering its high cost. One of the more versatile catalyst supports is activated carbon. Recently, attention has focused on wood as carbon material precursor, because of its sustainability and also because the obtained carbons have excellent final properties. In the present work, activated carbon obtained by physical activation of Eucalyptus grandis wood (biocarbon) was tested as Pt and PtSn catalyst support, for ethanol electro-oxidation reaction. For comparison purposes, commercial activated carbon Vulcan XC72 was also tested. The catalyst supports were characterized by textural analysis, elemental analysis and infrared spectroscopy. The obtained catalysts were characterized regarding structure by XRD and their electrochemical behavior was evaluated by cyclic voltammetry. Biocarbon-supported PtSn electrocatalysts showed better electrochemical performance related to the commercial activated carbon (Vulcan XC72)-supported ones, since its developed current density and potential were the highest and its onset potential was the lowest. However, pure platinum showed better values for current density, potential and onset potential in Vulcan XC72-based activated carbons, being the untreated one the best support in this case.

Autor

Leal da Silva, Elen
Ortega Vega, María Rita
dos Santos Correa, Patricia
Cuña, Andrés
de Fraga Malfatti, Célia

Fuente

International Journal of Hydrogen Energy v. 39, no. 27, 2014. -- p. 14760-14767

Editor

Elsevier

Fecha

2014

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PDF

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Inglés

Tipo

Artículo

Identificador

doi:10.1016/j.ijhydene.2014.07.103

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Original Format

PDF
Fecha de agregación
December 13, 2014
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Leal da Silva, Elen, “Influence of activated carbon porous texture on catalyst activity for ethanol electro-oxidation,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed November 20, 2019, http://riquim.fq.edu.uy/items/show/2291.
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