In Situ Probing of Ion Ordering at an Electrified Ionic Liquid/Au Interface

Advanced Materials
Wattaka SitaputraJerzy T Sadowski

Abstract

Charge transport at the interface of electrodes and ionic liquids is critical for the use of the latter as electrolytes. A room-temperature ionic liquid, 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide (EMMIM TFSI), is investigated in situ under applied bias voltage with a novel method using low-energy electron and photoemission electron microscopy. Changes in photoelectron yield as a function of bias applied to electrodes provide a direct measure of the dynamics of ion reconfiguration and electrostatic responses of the EMMIM TFSI. Long-range and correlated ionic reconfigurations that occur near the electrodes are found to be a function of temperature and thickness, which, in turn, relate to ionic mobility and different configurations for out-of-plane ordering near the electrode interfaces, with a critical transition in ion mobility for films thicker than three monolayers.

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Citations

Nov 10, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Ghulam M PanhwarOleksandr Bondarchuk

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