Applied Surface Science, ( ISI ), Volume (317), No (3), Year (2014-7) , Pages (496-504)

Title : ( Pt catalysts on PANI coated WC/C nanocomposites for methanol electro-oxidation and oxygen electro-reduction in DMFC )

Authors: Maryam Yaldagard , Mohsen Jahanshahi , Nasser Saghatoleslami ,

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In the present study a Pt/PANI/WC/C electrocatalyst was developed to increase the methanol electro- oxidation and oxygen electro-reduction activity and stability of commercial Pt/C electrocatalyst. WC/C was coated with protonated polyaniline (PANI) in situ during the polymerization of aniline. Fourier trans- form infrared (FTIR) results illustrate the presence of PANI in the composite. The conductivity of PANI coated- WC/C has been compared with the conductivity of the corresponding mixtures of WC/C and Vulcan XC-72. X-ray diffraction results showed that Pt particles were dispersed on the support with mean particle size of about 10.56 nm. Transition electron microscopy images showed that the nanosized WC/C were successfully coated by PANI. Based on the electrochemical properties characterized by cyclic voltammetry, CO stripping and rotating disk electrode measurements it was found that the as prepared Pt/PANI/WC/C electrocatalyst exhibited a comparable activity for methanol oxidation reaction and oxy- gen reduction reaction with respect to the commercial one. A significant reduction in the potential of CO electro-oxidation peak from 0.75 V for Pt/C to 0.52 V for Pt/PANI/WC/C electrocatalyst indicates that an increase in the activity for CO electro-oxidation is achieved by replacing the carbon support by PANI coated WC/C. Chronoamerometry results also showed, in the presence of methanol the Pt/PANI/WC/C electrocatalyst still maintains a higher current density than Pt/WC/C and Pt/C.

Keywords

, Methanol electro-oxidation, Oxygen electro-reduction , PANI WC/C nanocomposites , Activity and stability Microwave
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@article{paperid:1043109,
author = {Yaldagard, Maryam and Mohsen Jahanshahi and Saghatoleslami, Nasser},
title = {Pt catalysts on PANI coated WC/C nanocomposites for methanol electro-oxidation and oxygen electro-reduction in DMFC},
journal = {Applied Surface Science},
year = {2014},
volume = {317},
number = {3},
month = {July},
issn = {0169-4332},
pages = {496--504},
numpages = {8},
keywords = {Methanol electro-oxidation، Oxygen electro-reduction ، PANI WC/C nanocomposites ،Activity and stability Microwave heating},
}

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%0 Journal Article
%T Pt catalysts on PANI coated WC/C nanocomposites for methanol electro-oxidation and oxygen electro-reduction in DMFC
%A Yaldagard, Maryam
%A Mohsen Jahanshahi
%A Saghatoleslami, Nasser
%J Applied Surface Science
%@ 0169-4332
%D 2014

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