The metal – ionic liquid interface as characterized by impedance spectroscopy and in-situ scanning tunneling microscopy

Pajkossy, Tamás and Müller, Claus and Jacob, Timo (2018) The metal – ionic liquid interface as characterized by impedance spectroscopy and in-situ scanning tunneling microscopy. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 20. pp. 21241-21250. ISSN 1463-9076

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Abstract

We summarize our results of electrochemical measurements carried out on inert or close-to-inert metals in ionic liquids, with the aim to explore the metal | ionic liquid interface structure. To this we used electrochemical methods: cyclic voltammetry, impedance spectroscopy, potential of zero total charge measurements and structure-sensitive techniques, such as in-situ scanning tunneling spectroscopy. The studied systems were mostly single crystals of noble metals in imidazolium-based ionic liquids. The two main findings are: (i) in the potential window where no Faradaic reactions occur, the interfacial capacitance exhibits a frequency dependence due to double-layer rearrangement processes and (ii) in certain cases ordered anion and cation structures exist at the interface.

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