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@ARTICLE{Scheijen:817,
      author       = {Scheijen, F. J. E. and Beltramo, G. L. and Hoeppener, S.
                      and Housmans, T. H. M. and Koper, M. T. M.},
      title        = {{T}he electrooxidation of small organic molecules on
                      platinum nanoparticles supported on gold: influence of
                      platinum deposition procedure},
      journal      = {Journal of solid state electrochemistry},
      volume       = {12},
      issn         = {1432-8488},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PreJuSER-817},
      pages        = {483 - 495},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The electrocatalytic properties of small platinum
                      nanoparticles were investigated for the oxidation of CO,
                      methanol, and formic acid using voltammetry,
                      chronoamperometry, and surface-enhanced Raman spectroscopy.
                      The particles were generated by galvanostatic deposition of
                      platinum on a polished gold surface from an H2PtCl6
                      containing electrolyte and ranged between 10 and 20 nm in
                      diameter for low platinum surface concentrations, 10 and 120
                      nm for medium concentrations, and full Pt monolayers for
                      high concentrations. CO stripping and bulk CO oxidation
                      experiments on the particles up to 120 nm in diameter
                      displayed pronounced structural effects. The CO oxidation
                      current-time transients show a current decay for low
                      platinum coverages and a current maximum for medium and high
                      coverages. These results were also observed in the
                      literature for particles of 2- to 5-nm size and agglomerates
                      of these particles. The similarities between the literature
                      and our results, despite large differences in particle size
                      and morphology, suggest that particle structure and
                      morphology are also very important catalytic parameters.
                      Surface-enhanced Raman spectroscopy data obtained for the
                      oxidation of CO on the Pt-modified Au electrodes corroborate
                      this conclusion. A difference in the ratio between CO
                      adsorbed in linear- and bridge-bonded positions on the Pt
                      nanoparticles of different sizes demonstrates the influence
                      of the surface morphology. The oxidation activity of
                      methanol was found to decrease with the particle size, while
                      the formic acid oxidation rate increases. Again, a
                      structural effect is observed for particles of up to ca. 120
                      nm in diameter, which is much larger than the particles for
                      which a particle size effect was reported in the literature.
                      The particle shape effect for the methanol oxidation
                      reaction can be explained by a reduction in available
                      "ensemble sites" and a reduction in the mobility of CO
                      formed by decomposition of methanol. As formic acid does not
                      require Pt ensemble sites, decreasing the particle size, and
                      thus, the relative number of defects, increases the reaction
                      rate.},
      keywords     = {J (WoSType)},
      cin          = {IBN-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB802},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK414},
      shelfmark    = {Electrochemistry},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000253682900003},
      doi          = {10.1007/s10008-007-0343-z},
      url          = {https://juser.fz-juelich.de/record/817},
}