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Electrochemical oxygen reduction reaction by pt nanoparticles on carbon support stabilized by polyoxometalates
Pilli Satyananda Kishore, Balasubramanian Viswanathan, Thirukkallam Kanthadai Varadarajan
Published in
2009
Volume: 9
   
Issue: 9
Pages: 5188 - 5197
Abstract
The abilities of Keggin type polyoxometalate, silicotungstic acid (STA) to reduce metal ions by electron transfer and to modify carbon surface by strong adsorption have been explored for the preparation of Pt nanoparticles supported on carbon composites (20% Pt/STA-C). The prepared composites were characterized by Transmission electron microscopy (TEM and HRTEM)), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The electrocatalytic activities of the prepared nanocomposites were examined by using Cyclic voltammetry (CV) for oxygen reduction reaction which takes place at cathode in fuel cells. The prepared composite (20% Pt/STA-C) proved efficient compared to STA free 20% Pt/C, prepared by hydrogen reduction method. H 2O 2 intermediate formation is a serious concern as it reduces the activity of Pt sites during oxygen reduction. The composites prepared by polyoxometalate reduction method (20% Pt/STA-C) showed better reduction ability towards H 2O 2 compared to STA free 20% Pt/C composite and thus showed better performance as cathode electrocatalyst for fuel cells. Copyright © 2009 American Scientific Publishers All rights reserved.
About the journal
JournalJournal of Nanoscience and Nanotechnology
ISSN15334880
Open AccessNo
Concepts (39)
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    Carbon composites
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    CARBON SUPPORT
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    CARBON SURFACE
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    Electrocatalytic activity
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    ELECTROCHEMICAL OXYGEN REDUCTION
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    Electron transfer
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    FT-IR SPECTROSCOPY
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    Hydrogen reduction
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    INTERMEDIATE FORMATION
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    KEGGIN-TYPE
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    Oxygen reduction
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    Oxygen reduction reaction
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    Polyoxometalates
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    PT NANOPARTICLES
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    Reduction method
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    SILICOTUNGSTIC ACID
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    TEM
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    Acids
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    Adsorption
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    Carbon carbon composites
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    Cell membranes
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    Electrocatalysis
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    Electrocatalysts
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    Electrolytic reduction
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    Fourier transform infrared spectroscopy
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    Fuel cells
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    Hydrogen
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    Metal ions
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    Nanoparticles
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    Oxygen
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    Platinum
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    Platinum alloys
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    Spectroscopic analysis
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    Spectroscopy
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    Storm sewers
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    Synthetic apertures
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    Transmission electron microscopy
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    X ray diffraction
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    Cyclic voltammetry