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000030246 0247_ $$2DOI$$a10.1016/j.electacta.2003.06.002
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000030246 084__ $$2WoS$$aElectrochemistry
000030246 1001_ $$0P:(DE-Juel1)VDB5443$$aWandlowski, T.$$b0$$uFZJ
000030246 245__ $$aSurface Enhanced Infrared Spectroscopy - Au(111-20nm)/Sulphuric Acid - New Aspects and Challanges
000030246 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2004
000030246 300__ $$a1233 - 1247
000030246 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000030246 440_0 $$01776$$aElectrochimica Acta$$v49$$x0013-4686
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000030246 520__ $$aThe structure and orientation of water molecules on Au(1 1 1-20nm) film electrodes in contact with aqueous sulphuric acid solution was studied by surface enhanced infrared reflection-absorption spectroscopy (SEIRAS) employing an attenuated total reflection (ATR) configuration (ATR-SEIRAS) with a vertical spectroelectrochemical cell. The spectrum of interfacial water is strongly dependent on electrode potential, ionic strength and pH. Coadsorption of hydronium ions with weakly hydrogen-bonded water molecules was found at E < E-pzc. At E > E-pzc strong hydrogen-bonding among water molecules and to coadsorbed sulphate species exists. Based on pH-dependent electrochemical, spectroscopic and in situ STM investigations, a new model is suggested to represent the ordered (root3 x root7) adlayer at maximum sulphate coverage theta = 0.2: a Zundel or hydrated hydronium ion H5O2+, in which one proton is shared between two water molecules, bridges adjacent sulphate species via hydrogen-bonds along the main diagonal of the (root3 x root7) unit cell. This alternating arrangement gives rise to a long-range ordered, 2D network of sulphate and water species interconnected by hydrogen-bonds, and capable to form hydrogen-bonds with second-layer water species. The suggested model is consistent with all experimental observations as well as predictions from quantum-chemical and molecular dynamic simulations. (C) 2003 Elsevier Ltd. All rights reserved.
000030246 536__ $$0G:(DE-Juel1)FUEK252$$2G:(DE-HGF)$$aMaterialien, Prozesse und Bauelemente für die  Mikro- und Nanoelektronik$$cI01$$x0
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000030246 65320 $$2Author$$aATR-SEIRAS
000030246 65320 $$2Author$$aAu(1 1 1-20 nm) film
000030246 65320 $$2Author$$asingle crystals
000030246 65320 $$2Author$$awater
000030246 65320 $$2Author$$aZundel ion
000030246 65320 $$2Author$$asulphate
000030246 7001_ $$0P:(DE-Juel1)VDB5396$$aAtaka, K.$$b1$$uFZJ
000030246 7001_ $$0P:(DE-Juel1)VDB22265$$aPronkin, S.$$b2$$uFZJ
000030246 7001_ $$0P:(DE-Juel1)VDB14258$$aDiesing, D.$$b3$$uFZJ
000030246 773__ $$0PERI:(DE-600)1483548-4$$a10.1016/j.electacta.2003.06.002$$gVol. 49, p. 1233 - 1247$$p1233 - 1247$$q49<1233 - 1247$$tElectrochimica acta$$v49$$x0013-4686$$y2004
000030246 8567_ $$uhttp://dx.doi.org/10.1016/j.electacta.2003.06.002
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000030246 9141_ $$y2004
000030246 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
000030246 9201_ $$0I:(DE-Juel1)VDB43$$d31.12.2006$$gISG$$kISG-3$$lInstitut für Grenzflächen und Vakuumtechnologien$$x0
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