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Electrode screening by ionic liquids

Lynden-Bell, R. M. and Frolov, A. I. and Fedorov, M. V. (2012) Electrode screening by ionic liquids. Physical Chemistry Chemical Physics, 14 (8). pp. 2693-2701. ISSN 1463-9076

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In this work we are concerned with the short-range screening provided by the ionic liquid dimethylimidazolium chloride near a charged wall. We study the free energy profiles (or potentials of mean force) for charged and neutral solutes as a function of distance from a charged wall. Four different wall charge densities are used in addition to a wall with zero charge. The highest magnitude of the charge densities is +/- 1 e nm(-2) which is close to the maximum limit of charge densities accessible in experiments, while the intermediate charges +/- 0.5 e nm(-2) are in the range of densities typically used in most of the experimental studies. Positively and negatively charged solutes of approximately the size of a BF4- ion and a Cl- ion are used as probes. We find that the ionic liquid provides excellent electrostatic screening at a distance of 1-2 nm. The free energy profiles show minima which are due to layering in the ionic liquid near the electrodes. This indicates that the solute ions tend to displace ionic liquid ions in the layers when approaching the electrode. The important role of non-electrostatic forces is demonstrated by the oscillations in the free energy profiles of uncharged solutes as a function of distance from the wall.

Item type: Article
ID code: 39879
Keywords: ionic liquids , electrode screening, Solid state physics. Nanoscience, Chemistry, Physics and Astronomy(all), Physical and Theoretical Chemistry
Subjects: Science > Physics > Solid state physics. Nanoscience
Science > Chemistry
Department: Faculty of Science > Physics
Technology and Innovation Centre > Bionanotechnology
Depositing user: Pure Administrator
Date Deposited: 30 May 2012 15:18
Last modified: 29 Jan 2016 03:26
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