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000032158 0247_ $$2DOI$$a10.1016/j.susc.2004.05.141
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000032158 084__ $$2WoS$$aChemistry, Physical
000032158 084__ $$2WoS$$aPhysics, Condensed Matter
000032158 1001_ $$0P:(DE-Juel1)VDB22265$$aPronkin, S.$$b0$$uFZJ
000032158 245__ $$aATR-SEIRAS - an approach to probe the reactivity of Pd-modified quasi-single crystal gold film electrodes
000032158 260__ $$aAmsterdam$$bElsevier$$c2004
000032158 300__ $$a109 - 127
000032158 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000032158 440_0 $$05673$$aSurface Science$$v573$$x0039-6028
000032158 500__ $$aRecord converted from VDB: 12.11.2012
000032158 520__ $$aQuasi-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.
000032158 536__ $$0G:(DE-Juel1)FUEK252$$2G:(DE-HGF)$$aMaterialien, Prozesse und Bauelemente für die  Mikro- und Nanoelektronik$$cI01$$x0
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000032158 650_7 $$2WoSType$$aJ
000032158 65320 $$2Author$$ainfrared absorption spectroscopy
000032158 65320 $$2Author$$acarbon monoxide
000032158 65320 $$2Author$$agold
000032158 65320 $$2Author$$apalladium
000032158 65320 $$2Author$$ametallic films
000032158 65320 $$2Author$$aelectrochemical methods
000032158 65320 $$2Author$$aoxidation
000032158 65320 $$2Author$$aphysical adsorption
000032158 65320 $$2Author$$achemisorption
000032158 65320 $$2Author$$asurface defects
000032158 65320 $$2Author$$avibrations of adsorbed molecules
000032158 7001_ $$0P:(DE-Juel1)VDB5443$$aWandlowski, T.$$b1$$uFZJ
000032158 773__ $$0PERI:(DE-600)1479030-0$$a10.1016/j.susc.2004.05.141$$gVol. 573, p. 109 - 127$$p109 - 127$$q573<109 - 127$$tSurface science$$v573$$x0039-6028$$y2004
000032158 8567_ $$uhttp://dx.doi.org/10.1016/j.susc.2004.05.141
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000032158 9141_ $$y2004
000032158 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
000032158 9201_ $$0I:(DE-Juel1)VDB43$$d31.12.2006$$gISG$$kISG-3$$lInstitut für Grenzflächen und Vakuumtechnologien$$x0
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