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    Enhanced oxygen reduction at Pd catalytic nanoparticles dispersed onto heteropolytungstate-assembled poly(diallyldimethylammonium)-functionalized carbon nanotubes

    Access Status
    Fulltext not available
    Authors
    Wang, D.
    Lu, S.
    Kulesza, P.
    Chang, M.L.
    De Marco, Roland
    Jiang, San Ping
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Wang, Deli and Lu, Shanfu and Kulesza, Pawel J. and Chang, Ming Li and De Marco, Roland and Jiang, San Ping. 2011. Enhanced oxygen reduction at Pd catalytic nanoparticles dispersed onto heteropolytungstate-assembled poly(diallyldimethylammonium)-functionalized carbon nanotubes. Physical Chemistry Chemical Physics. 13: pp. 4400-4410.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c0cp02036b
    ISSN
    14639076
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/42128
    Collection
    • Curtin Research Publications
    Abstract

    Both Keggin-type phosphotungstic acid (HPW) and Pd are not prominent catalysts towards the oxygen reduction (ORR), but their composite Pd-HPW catalyst produces a significantly higher electrochemical activity for the ORR in acidic media. The novel composite catalyst was synthesized by self-assembly of HPW on multi-walled carbon nanotubes (MWCNTs) via the electrostatic attraction between negatively charged HPW and positively charged poly(diallyldimethylammonium (PDDA)-wrapped MWCNTs, followed by dispersion of Pd nanoparticles onto the HPW–PDDA–MWCNT assembly. The as-prepared catalyst was characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric analysis (TGA), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS).TEM images show that Pd nanoparticles were uniformly dispersed on the surface of MWCNTs even when the Pd loading was increased to 60 wt%. Electrochemical activity of the catalysts for the ORR was evaluated by steady state polarization measurements using a rotating disk electrode. Compared with the acid treated MWCNTs, Pd nanoparticles supported on the HPW-assembled MWCNTs show a much higher ORR activity that is comparable to conventional Pt/C catalysts. The high electrocatalytic activities could be related to high dispersion of Pd nanoparticles as well as synergistic effects originating from the high proton conductivity of HPW. The Pd/HPW–PDDA–MWCNTs system as the cathode catalyst in proton exchange membrane fuel cells is demonstrated.

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