Polarization Losses under Accelerated Stress Test Using Multiwalled Carbon Nanotube Supported Pt Catalyst in PEM Fuel Cells

The electrochemical behavior for Pt catalysts supported on multiwalled carbon nanotubes and Vulcan XC-72 in proton exchange membrane fuel cells under accelerated stress test was examined by cyclic voltammetry, electrochemical impedance spectroscopy, and polarization technique. Pt catalyst supported...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2011-01, Vol.158 (3), p.B297
Main Authors: Park, Sehkyu, Shao, Yuyan, Kou, Rong, Viswanathan, Vilayanur V., Towne, Silas A., Rieke, Peter C., Liu, Jun, Lin, Yuehe, Wang, Yong
Format: Article
Language:English
Subjects:
30 DIRECT ENERGY CONVERSION
accelerated stress test
CARBON
carbon nanotubes
CATALYSTS
CORROSION RESISTANCE
CURRENT DENSITY
ELECTRIC CONDUCTIVITY
Environmental Molecular Sciences Laboratory
FUEL CELLS
IMPEDANCE
KINETICS
MASS TRANSFER
NANOTUBES
OXYGEN
POLARIZATION
polarization losses
PROTON EXCHANGE MEMBRANE FUEL CELLS
PROTON TRANSPORT
SPECTROSCOPY
STRONG INTERACTIONS
SURFACE AREA
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Summary:The electrochemical behavior for Pt catalysts supported on multiwalled carbon nanotubes and Vulcan XC-72 in proton exchange membrane fuel cells under accelerated stress test was examined by cyclic voltammetry, electrochemical impedance spectroscopy, and polarization technique. Pt catalyst supported on multiwalled carbon nanotubes exhibited highly stable electrochemical surface area, oxygen reduction kinetics, and fuel cell performance at a highly oxidizing condition, indicating multiwalled carbon nanotubes show high corrosion resistance and strong interaction with Pt nanoparticles. The Tafel slope, ohmic resistances, and limiting current density determined were used to differentiate kinetic, ohmic, mass-transfer polarization losses from the actual polarization curve. Kinetic contribution to the total overpotential was larger throughout the stress test. However, the fraction of kinetic overpotential decreased and mass-transfer overpotential portion remained quite constant during accelerated stress test, whereas the fraction of ohmic overpotential primarily originating from severe proton transport limitation in the catalyst layer increased under the anodic potential hold.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.3530843