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Platinum-carbon black-titanium dioxide nanocomposite electrocatalysts for fuel cell applications

Content Provider	Springer Nature Link
Author	Sambandam, Satheesh Valluri, Vidh Chanmanee, Wilaiwan Tacconi, rma R. Wampler, Wesley A. Lin, Wen Yuan Carlson, Thomas F. Ramani, Vijay Rajeshwar, Krishnan
Copyright Year	2009
Abstract	New-generation Pt/C-TiO$_{2}$ nanocomposite electrocatalysts for fuel cells, prepared by a heterogeneous photocatalytic method, have been characterized using techniques such as cyclic voltammetry, rotating disk electrode (RDE) voltammetry, and electrochemical impedance spectroscopy (EIS). Importantly, galvanostatic data confirm the superior stability of these materials against corrosion under anodic polarization conditions relative to commercial benchmark fuel cell electrocatalysts. EIS spectra from ETEK 5, SIDCAT 405 and SIDCAT 410 membrane electrode assemblies (MEAs) were fit to a Randles equivalent circuit with a Warburg element to show the presence of O$_{2}$ transport limitation arising from the use of thicker electrodes (lower Pt loading on carbon). The use of a constant phase element (CPE) instead of pure capacitor was justified from the fit procedure as CPE represents the porous electrode system more precisely with its distributive elements. EIS spectra from Tanaka, SIDCAT 451 and SIDCAT 452 MEAs (thinner electrodes) were fit to a Randles circuit with a pure capacitor and no Warburg element. The use of a transmission line model for fitting these data independently provided information about the catalyst layer resistance while all other parameters matched well with that of the Randles circuit. The effective proton transport in cathodes was quantified using polarization data for both classes of MEAs. Trends in the previously reported performance of MEAs prepared using these electrocatalysts were justified based on the relative contributions of kinetic, Ohmic and mass transfer losses to the overall overpotential, which in turn were estimated from impedance and polarization data analyses.
Starting Page	655
Ending Page	664
Page Count	10
File Format	PDF
ISSN	09743626
Journal	Journal of Chemical Sciences
Volume Number	121
Issue Number	5
e-ISSN	09737103
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-11-19
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electrochemical impedance spectroscopy membrane electrode assembly electrochemically active surface area oxygen reduction reaction polymer electrolyte fuel cell Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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