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@ARTICLE{Pronkin:32158,
      author       = {Pronkin, S. and Wandlowski, T.},
      title        = {{ATR}-{SEIRAS} - an approach to probe the reactivity of
                      {P}d-modified quasi-single crystal gold film electrodes},
      journal      = {Surface science},
      volume       = {573},
      issn         = {0039-6028},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-32158},
      pages        = {109 - 127},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Quasi-single crystalline gold films of 20 nm thickness and
                      preferential (111) orientation on Si hemispheres were
                      modified by controlled potentiostatic deposition of Pd
                      (sub-ML, ML, multi-L) from sulphate and/or
                      chloride-containing electrolyte. The electrochemical
                      properties of these model electrodes were characterised for
                      hydrogen and (hydrogen-) sulphate adsorption as well as for
                      surface oxide formation by cyclic voltammetry. Conditions
                      were developed to fabricate defined and stable I'd
                      monolayers. In situ ATR-SEIRAS (Attenuated Total Reflection
                      Surface Enhanced Infrared Reflection Absorption
                      Spectroscopy) experiments were carried out to describe the
                      electrochemical double layer of Pd modified gold film
                      electrodes in contact with aqueous 0.1 M H2SO4 with focus on
                      interfacial water and anion adsorption. Based on an analysis
                      of the non-resonant IR background signal the potential of
                      zero charge is estimated to 0.10-0.20 V (vs. RHE). CO was
                      found to be weakly physisorbed in atop sites on Au(111-20
                      nm)/0.1 M H2SO4 only in CO saturated electrolyte. CO,
                      deposited on a quasi-single crystal gold film modified with
                      I NIL Pd, is chemisorbed with preferential occupation of
                      bridge sites and atop positions at step edges. Saturated CO
                      adlayers, as obtained by deposition at 0.10 V, contain
                      isolated water species and are covered by a second layer of
                      hydrogen bonded water. Potentiodynamic SEIRAS experiments of
                      CO electro-oxidation on Pd-modified gold film electrodes
                      demonstrate clearly the existence of a "pre-oxidation"
                      region. They also provide spectroscopic evidence that
                      isolated water and weakly hydrogen bonded water are consumed
                      during the reaction and that atop CO on defect sites is a
                      preferential reactant. The simultaneous in situ monitoring
                      of the potential- and time-dependent evolution of
                      characteristic vibrational modes in the OH- and
                      CO-stretching regions are in agreement with the Gilman
                      ("reactant pair") mechanism of CO oxidation. (C) 2004
                      Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {ISG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB43},
      pnm          = {Materialien, Prozesse und Bauelemente für die Mikro- und
                      Nanoelektronik},
      pid          = {G:(DE-Juel1)FUEK252},
      shelfmark    = {Chemistry, Physical / Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000225660000013},
      doi          = {10.1016/j.susc.2004.05.141},
      url          = {https://juser.fz-juelich.de/record/32158},
}