Journal
ELECTROCHIMICA ACTA
Volume 225, Issue -, Pages 190-197Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.12.092
Keywords
Ionic liquids; Double layer; short-range correlations; ion pairing
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Funding
- EPSRC [EP/H004319/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H004319/1] Funding Source: researchfish
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We develop the theory of the electrical double layer in ionic liquids as proposed earlier by Kornyshev (2007). In the free energy function we keep the so called short-range correlation terms which were omitted there. With some simplifying assumptions, we arrive at a modified expression for differential capacitance, which makes differential capacitance curves less sharply depending on electrode potential and having smaller values at extrema than in the previous theory. This brings the results closer to typical experimental observations, and makes it appealing to use this formalism for treatment of experimental data. Implications on Debye length and the extent of ion paring in ionic liquids are then briefly discussed. (C) 2016 Elsevier Ltd. All right reserved.
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