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Interface between an Au(111) Surface and an Ionic Liquid: The Influence of Water on the Double-Layer Capacitance

Lookup NU author(s): Dr Jochen Friedl, Maximilian Herpick, 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.

Publication metadata

Author(s): Friedl J, Markovits I, Herpich M, Feng G, Kornyshev A, Stimming U

Publication type: Article

Publication status: Published

Journal: ChemElectroChem

Year: 2017

Volume: 4

Issue: 1

Pages: 216-220

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


DOI: 10.1002/celc.201600557


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