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Lookup NU author(s): Dr Jochen Friedl,
Professor Ulrich Stimming
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley - VCH Verlag GmbH & Co. KGaA, 2017.
For re-use rights please refer to the publisher's terms and conditions.
The presence of water in room-temperature ionic liquids (RTILs) can have a strong effect on their properties. In particular, water adsorption at electrodes can reduce the electrochemical potential window of the system. It is, thus, important to understand where water will be present depending on the electrode potential, the type of ionic liquid, and the electrode material. We investigate the influence of water on RTILs by measuring the potential-dependent double-layer capacitance of various water–RTIL mixtures. The resulting capacitance versus potential curves are reproduced employing mean-field theory calculations. From the parameters used to obtain the best agreement between experimental and theoretical curves, some properties of the RTILs can be deducted, such as a stronger interaction of water with RTIL anions than cations and an agglomeration of water at potentials positive or negative of the potential of zero charge.
Author(s): Friedl J, Markovits I, Herpich M, Feng G, Kornyshev A, Stimming U
Publication type: Article
Publication status: Published
Print publication date: 01/01/2017
Online publication date: 20/10/2016
Acceptance date: 19/10/2016
Date deposited: 03/11/2016
ISSN (electronic): 2196-0216
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
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