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@ARTICLE{Wandlowski:30246,
author = {Wandlowski, T. and Ataka, K. and Pronkin, S. and Diesing,
D.},
title = {{S}urface {E}nhanced {I}nfrared {S}pectroscopy -
{A}u(111-20nm)/{S}ulphuric {A}cid - {N}ew {A}spects and
{C}hallanges},
journal = {Electrochimica acta},
volume = {49},
issn = {0013-4686},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {PreJuSER-30246},
pages = {1233 - 1247},
year = {2004},
note = {Record converted from VDB: 12.11.2012},
abstract = {The 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.},
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 = {Electrochemistry},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000189226200006},
doi = {10.1016/j.electacta.2003.06.002},
url = {https://juser.fz-juelich.de/record/30246},
}