Pt/carbon nanofibers electrocatalysts for fuel cells

Different Pt-based electrocatalysts supported on carbon nanofibers and carbon black (Vulcan XC-72R) have been prepared using a polymer-mediated synthesis. The electrocatalysts have been characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and cyclic voltammetry. The effec...

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Bibliographic Details
Published in:Journal of power sources 2007-09, Vol.171 (2), p.302-309
Main Authors: Zaragoza-Martín, F., Sopeña-Escario, D., Morallón, E., de Lecea, C. Salinas-Martínez
Format: Article
Language:English
Subjects:
Carbon nanofibers
Characterization
Fuel cells
Pt/carbon electrocatalysts
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Summary:Different Pt-based electrocatalysts supported on carbon nanofibers and carbon black (Vulcan XC-72R) have been prepared using a polymer-mediated synthesis. The electrocatalysts have been characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and cyclic voltammetry. The effect of carbon nanofibers treatment with HNO 3 solution on Pt particle size and electroactive area has been analyzed. Highly dispersed Pt with homogeneous particle size and an electroactive area around of 100 m 2 g −1 is obtained in raw carbon nanofibers. The oxidizing treatment of the carbon nanofibers produces agglomeration of the platinum nanoparticles and an electroactive area of 53 m 2 g −1. Durability studies indicate a decrease of 14% in the electroactive area after 90 h at 1.2 V in 0.5 M H 2SO 4 for platinum supported on raw carbon nanofibers and Vulcan XC-72R. The electrocatalyst supported on oxidized carbon nanofibers are stable under similar conditions.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2007.06.078