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Journal of Materials Science
Published in: Journal of Materials Science 2/2008

01-01-2008

Purification of catalytically produced carbon nanotubes for use as support for fuel cell cathode Pt catalyst

Authors: Ana Maria Rocco, Cristiane A. da Silva, Maria I. F. Macedo, Luis Fernando Maestro, Marcelo H. Herbst, Guillermo Solórzano, Altair L. Xavier

Published in: Journal of Materials Science | Issue 2/2008

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Abstract

A purification method based on HCl treatment under reflux was employed for purification of carbon nanotube (CNT) samples, obtained by the electric discharge method utilizing Zr(Co0.5Ni0.5)2, Ce3(Co0.5Ni0.5)2 and Ce(Co0.5Ni0.5)5 as catalysts. Raman Spectroscopy provided information on the SWCNT presence in the untreated samples. Scanning Electron Microscopy (SEM) showed CNT with different diameters and lengths. Different acid treatment conditions were employed and the best results were achieved for HCl 3 mol/L aqueous solution during 24 h reflux. Transmission Electron Microscopy (TEM) images, associated with EDS, revealed the catalyst removal from the original sample and the presence of other carbon structures near the CNT formation. CNT acid functionalization for Pt nanoparticles dispersion was successful, resulting in a homogeneously dispersed system, as seen in TEM images. Temperature Programmed Oxidation (TPO) analysis of the raw and purified samples indicated that after purification there are three different carbon species present on the purified material, each one showing a different behavior towards O2 oxidation.
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Metadata
Title
Purification of catalytically produced carbon nanotubes for use as support for fuel cell cathode Pt catalyst
Authors
Ana Maria Rocco
Cristiane A. da Silva
Maria I. F. Macedo
Luis Fernando Maestro
Marcelo H. Herbst
Guillermo Solórzano
Altair L. Xavier
Publication date
01-01-2008
Publisher
Springer US
Published in
Journal of Materials Science / Issue 2/2008
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-007-1779-3

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