Abstract
Water adsorption is important in many fields from surface electrochemistry to electrocatalysis where molecular level information is much needed in order to gain a detailed understand on the role of interfacial water. Here we report on water at Pt(111) surfaces in contact with an [EIMIM][BF4] ionic liquid, which was spectroscopically resolved by using in situ sum-frequency generation (SFG). O-H modes are used to study water adsorption and water structure as a function of electrode potential, while analysis of C-H modes is used to infer orientational changes of [EMIM] cations at the interface. Different from the bulk where free water molecules are found, SFG spectra provide evidence an interfacial layer with an extended network of hydrogen-bonded water molecules exists and grows with increasing absolute potential which is used to identify the potential of zero charge at +0.1 V SHE where a pronounced minimum in O-H intensity is found.
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