Temperature-dependent capacitance of the electrical double layer

We use atomistic simulations to study the electrical double layer (EDL) at an electrode–electrolyte interface at different temperatures. For a constrained electrode charge, the potential drop over the EDL increases with temperature, a phenomenon known as the thermal voltage rise (TVR). Prior continuum models attributed TVR to expansion of the EDL with increasing temperature; conversely, our simulations with aqueous, organic, and ionic liquids show that the EDL does not expand but that the TVR is caused by a decrease in interfacial permittivity with increasing temperatures.

DDC Class

620.1: Engineering Mechanics and Materials Science

Funding(s)

EXC 3120 - BlueMat - Wassergesteuerte Materialien

More Funding Information

M.J. was supported by a FRIPRO grant from The Research Council of Norway (Project No. 345079). This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) as part of the Excellence Strategy of the Federal Government and the federal states – EXC 3120/1 BlueMat: Water-Driven Materials – 533771286.

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https://creativecommons.org/licenses/by/4.0/

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Temperature-dependent capacitance of the electrical double layer