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Development of conducting polypyrrole as corrosion-resistant catalyst support for polymer electrolyte membrane fuel cell (PEMFC) application

Paper ID Volume ID Publish Year Pages File Format Full-Text
47349 46469 2009 7 PDF Available
Title
Development of conducting polypyrrole as corrosion-resistant catalyst support for polymer electrolyte membrane fuel cell (PEMFC) application
Abstract

Three polypyrrole (PPy) samples were synthesized via in situ chemical oxidative polymerization to study their applications as an alternate cathode catalyst support material for polymer electrolyte membrane fuel cells (PEMFCs). The electrochemical stabilities of the PPy samples and commercial carbon supports (Vulcan XC-72) were examined by cyclic voltammetry (CV). In contrast to the carbon supports, only a small anodic current was observed for the PPy samples up to 1.8 V, indicating their resistance towards oxidation under high positive potentials. Among the PPy samples synthesized in this investigation, PPy-3 showed the highest electrical conductivity (1.67 S cm−1) and BET surface area of 69.6 m2 g−1, and therefore was selected as a catalyst support for further studies. The wet reduction method was chosen to prepare supported platinum catalyst (50 wt% Pt/PPy) by using sodium formate as reducing reagent. Transmission electron microscopy (TEM) image showed finely dispersed platinum crystallites with a diameter of dPt = 3.6 nm on the polypyrrole support. The potential cycling experiment revealed that Pt/PPy is electrochemically more stable than the Pt/C electrocatalyst. The oxygen reduction activity obtained from Tafel plots indicated twofold higher activity for Pt/PPy catalyst than that of Pt black catalyst at 0.9 V. Comparison of ORR activity and fuel cell polarization curves demonstrated good oxygen reduction reaction kinetics and comparable fuel cell performance with that of commercial E-TEK Pt/C catalyst for the Pt/PPy catalyst.

Keywords
Conducting polymer; Polypyrrole; Cathode catalyst support; Corrosion-resistance; Oxygen reduction reaction; Proton exchange membrane fuel cell
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Development of conducting polypyrrole as corrosion-resistant catalyst support for polymer electrolyte membrane fuel cell (PEMFC) application
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 93, Issues 1–2, 25 November 2009, Pages 75–81
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us