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Silicotungstic acid based carbon supported noble metal electrodes for energy conversion application
Pilli Satyananda Kishore, Balasubramanian Viswanathan, Thirukkallam Kanthadai Varadarajan
Published in
2009
Volume: 113
   
Issue: 29
Pages: 12918 - 12925
Abstract
In this paper, carbon supported noble metal nanoparticles synthesized by using Keggin type polyoxometalate (POM), silicotungstic acid (STA), were effectively utilized as electrodes in an effort to improve the efficiency of electrochemical energy conversion processes related to direct methanol fuel cells. The excellent electron transfer and strong adsorption abilities of STA have been well exploited for the reduction of metal ions as well as the modification of carbon support to form Pt and Pt-Ru metal nanoparticles supported on carbon nanostructure composites (Pt/STA-C and Pt-Ru/STA-C) under microwave irradiation. Transmission electron microscopy results indicated that well-dispersed metal nanoparticles were formed on the carbon support. The electrocatalytic properties of Pt/STA-C and Pt-Ru/STA-C were analyzed by cyclic voltammetry and chronoamperometry through the methanol oxidation reaction for fuel cell applications. As compared with the commercial Pt-Ru/C (Johnson Matthey) and Pt/C and Pt-Ru/C electrocatalysts prepared by using the common hydrogen reduction method, the STA containing Pt/STA-C and Pt-Ru/STA-C synthesized by the method developed in this work exhibited lower onset potential, high activity with enhanced stability, and better tolerance toward poisoning by CO for the methanol oxidation reaction. ©2009 American Chemical Society.
About the journal
JournalJournal of Physical Chemistry C
ISSN19327447
Open AccessNo
Concepts (46)
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    ADSORPTION ABILITY
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    Carbon nanostructures
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    CARBON SUPPORT
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    Conversion process
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    ELECTROCATALYTIC PROPERTIES
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    ELECTROCHEMICAL ENERGY
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    Electron transfer
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    Enhanced stability
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    FUEL CELL APPLICATION
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    HIGH ACTIVITY
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    Hydrogen reduction
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    JOHNSON MATTHEY
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    KEGGIN-TYPE
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    Metal nanoparticles
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    METHANOL OXIDATION REACTIONS
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    NOBLE METAL ELECTRODES
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    NOBLE METAL NANOPARTICLES
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    Onset potential
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    Polyoxometalates
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    SILICOTUNGSTIC ACID
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    Well-dispersed
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    Acids
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    Adsorption
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    Cell membranes
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    Chemical modification
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    Chronoamperometry
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    Cyclic voltammetry
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    Electrocatalysis
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    Electrocatalysts
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    Electrochemical electrodes
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    Energy conversion
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    Fuel cells
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    Hydrogen
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    Metal ions
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    Metals
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    Methanol
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    METHANOL FUELS
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    Microwave irradiation
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    Nanoparticles
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    Oxidation
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    Precious metals
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    Reduction
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    Storm sewers
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    Synthetic apertures
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    Transmission electron microscopy
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    Platinum