Nanostructured Pt/WOx-C Solids as Electrocatalyst for PEMFC
Platinum nanoparticles supported on high surface area carbon black (e.g., Vulcan XC-72) are the most commonly used catalysts for both cathode and anode in proton exchange membrane fuel cells (PEMFCs), however, some other catalysts such as Pt/MoOxand Pt/WOx are also considered promising, due to their higher activity, stability and enhanced CO tolerance. This work is focused on the synthesis and characterization of nanostructured Pt/WOx-C as both cathode and anode electrocatalysts for PEMFCs. The Pt deposit on the surface of the support is a crucial step in the synthesis of the catalytic materials. Because of this, different synthesis methods were probed in order to find the conditions for the higher dispersion and accessibility of Platinum over the WOx-C support and to improve the PEMFC cathode stability. The catalysts were prepared by UV and ultrasound assisted approaches, and characterized by Transmission Electron Microscopy as well as lineal and cyclic voltammetry.
polymer electrolyte fuel cell, electrocatalyst, platinum, WOx nanostructures.
Authors would like to acknowledge to the IPN for the grants and financial support received (SIP-20120486, 20120475 and multidisciplinary project SIP-13138), as well as the CONACYT (Project 130254). The authors also acknowledge the facilities of the Electron Microscopy Laboratory of the Instituto Mexicano del Petroleo for this work.
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