Before mass produced automotive fuel cell technology can be made practical, the oxidative instability of the carbons currently, used as the catalyst support at the oxygen electrode, must be addressed. This article describes a method for coating carbon (Vulcan XC-72) with protective barriers of titanium dioxide (titania) and provides the results of physical characterization tests on those materials. By combining the sol-gel coating process with high intensity ultrasonication and choosing the appropriate precursor, either the anatase or rutile phases of titania can be produced. More complete coverage of the carbon was provided by the anatase process. Accelerated gas-phase oxidation tests showed that platinized, anatase-coated carbon oxidized at 115 the rate of untreated carbon while the rutile phase showed a mass loss of 113 that of untreated carbon.


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    Title :

    Selective coating of anatase and rutileTiO2 on carbon via ultrasound irradiation: Mitigating fuel cell catalyst degradation


    Contributors:
    George, P.P. (author) / Pol, V.G. (author) / Gedanken, A. (author) / Gabashivilli, A. (author) / Cail, M. (author) / Mance, A.M. (author)


    Publication date :

    2008


    Size :

    9 Seiten, 10 Bilder, 4 Tabellen, 52 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English