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- W2080885905 abstract "The structure and orientation of water molecules on Au(1 1 1-20 nm) 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<Epzc. At E>Epzc 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 (3×7) adlayer at maximum sulphate coverage θ=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 (3×7) 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." @default.
- W2080885905 created "2016-06-24" @default.
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- W2080885905 date "2004-03-01" @default.
- W2080885905 modified "2023-10-10" @default.
- W2080885905 title "Surface enhanced infrared spectroscopy—Au(1 1 1-20nm)/sulphuric acid—new aspects and challenges" @default.
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- W2080885905 doi "https://doi.org/10.1016/j.electacta.2003.06.002" @default.
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