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

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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.

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

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Publication details

The article was received on 01 Apr 2018, accepted on 06 Aug 2018 and first published on 06 Aug 2018


Article type: Perspective
DOI: 10.1039/C8CP02074D
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    The metal–ionic liquid interface as characterized by impedance spectroscopy and in situ scanning tunneling microscopy

    T. Pajkossy, C. Müller and T. Jacob, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP02074D

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