Aqueous Deposition of Metals on Multiwalled Carbon Nanotubes to be Used as Electrocatalyst for Polymer Exchange Membrane Fuel Cells

[+] Author and Article Information
Y. Verde1

 Instituto Tecnológico de Cancún, Kabah km 3, Cancún, Quintana Roo 77500, Méxicoyverde@itcancun.edu.mx

A. Keer, M. Miki-Yoshida, F. Paraguay-Delgado, G. Alonso-Nuñez

 Centro de Investigación en Materiales, Avanzados S.C. Miguel de Cervantes 120, Complejo Industrial, Chihuahua, Chihuahua 31109, México

M. Avalos

 Centro de Ciencias de la Materia Condensada-UNAM, A. Postal 2681, Ensenada, B.C. 22800, México


Corresponding author.

J. Fuel Cell Sci. Technol 4(2), 130-133 (Sep 08, 2006) (4 pages) doi:10.1115/1.2714565 History: Received December 08, 2005; Revised September 08, 2006

The polymer exchange membrane fuel cell (PEMFC) is considered the new power source technology for portable applications. Pt and Pt–alloy nanoparticles supported on carbon black have been used traditionally to make electrodes due to their high activity for H2 oxidation and O2 reduction under PEMFC conditions. Recently, ammonium hexachloroplatinate (IV) ((NH4)2PtCl6) has been shown to be a good precursor of metallic Pt by thermal decomposition. In addition, multi-walled carbon nanotubes (MWCNTs) present convenient physical and chemical properties to be employed as a support for electrocatalysts. MWCNTs were synthesized by spray pyrolysis using a precursor solution of ferrocene dissolved in benzene or toluene. Ammonium hexachloroplatinate, ammonium hexachlororhutenate, and ammonium hexachloropaladate were used as the Pt, Ru, and Pd precursors, respectively. Aqueous solution reaction, followed by a two stage thermal process, was utilized to support separately Pt, Ru, and Pd nanoparticles on the MWCNT. The results suggest that the deposition takes place on anchored sites formed during the aqueous reaction, due to the in situ oxidation of the external wall of the nanotube. Very good dispersion and particle size between 3nm and 12nm were obtained for each metal. Such characteristics are advantageous for the use of CNT supported electrocatalyst in PEMFC and direct methanol fuel cell (DMFC) electrodes.

Copyright © 2007 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Thermogravimetric analysis of metal precursors

Grahic Jump Location
Figure 2

HRTEM images of: (a) Pt/MWCNT; (b) Pd/MWCNT; (c) Ru/MWCNT; and (d) Ru/MWCNT



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