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Towards an optimal synthesis route for the preparation of highly mesoporous carbon xerogel-supported Pt catalysts for the oxygen reduction reaction

AutorAlegre Gresa, Cinthia; Gálvez Parruca, María Elena; Moliner Álvarez, Rafael; Baglio, Vincenzo; Aricò, Antonino Salvatore; Lázaro Elorri, María Jesús
Palabras clavePt
Catalysts
Carbon xerogel
Synthesis method
ORR
Fecha de publicación18-oct-2013
EditorElsevier
CitaciónApplied Catalysis B - Environmental 147: 947-57 (2014)
ResumenPt particles were supported on a highly mesoporous carbon xerogel and used as catalysts for the oxygen reduction reaction (ORR) in Direct Methanol Fuel Cells (DMFCs). Different synthesis routes were followed in order to study their influence on the characteristics and the performance of Pt electrocatalysts, therefore determining the optimal synthesis method for the preparation of these carbon xerogel supported catalysts, leading to the highest catalytic activity. The highest active catalyst was compared to a Pt catalyst supported on commercial carbon support, Vulcan, synthesized in the same conditions. Synthesis methods studied were impregnation, following two different reduction protocols (sodium borohydride and formic acid), and microemulsion, used for the first time for carbon xerogels. The electrochemical characterization proved that the catalysts’ synthesis method strongly influenced the catalytic behavior. The impregnation method and reduction with formic acid lead to the highest active catalyst towards ORR. When compared to an analogously prepared Vulcan carbon black14 supported catalyst, the carbon xerogel-based one still showed enhanced performance, in spite of higher ohmic loss, due to the lower electrical conductivity of this carbon material.
Descripción11 páginas.-13 Figuras.- 5 Tablas.-Article history: Received 1 August 2013.- Received in revised form 10 October 2013.- Accepted 11 October 2013.- Available online 18 October 2013.-
Versión del editorhttp://dx.doi.org/10.1016/j.apcatb.2013.10.031
URIhttp://hdl.handle.net/10261/95123
DOI10.1016/j.apcatb.2013.10.031
ISSN0926-3373
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