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Structural Transitions at Ionic Liquid Interfaces

Abstract : Recent advances in experimental and computational techniques have allowed for an accurate description of the adsorption of ionic liquids on metallic electrodes. It is now well-established that they adopt a multilayered structure and that the composition of the layers changes with the potential of the electrode. In some cases, potential-driven ordering transitions in the first adsorbed layer have been observed in experiments probing the interface on the molecular scale or by molecular simulations. This perspective gives an overview of the current understanding of such transitions and of their potential impact on the physical and (electro)chemical processes at the interface. In particular, peaks in the differential capacitance, slow dynamics at the interface, and changes in the reactivity have been reported in electrochemical studies. Interfaces between ionic liquids and metallic electrodes are also highly relevant for their friction properties, the voltage-dependence of which opens the way to exciting applications.
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Benjamin Rotenberg, Mathieu Salanne. Structural Transitions at Ionic Liquid Interfaces. Journal of Physical Chemistry Letters, American Chemical Society, 2015, 6, pp.4978-4985. ⟨10.1021/acs.jpclett.5b01889⟩. ⟨hal-01287384⟩

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