Impedance Response of Ionic Liquids in Long Slit Pores

We study the dynamics of ionic liquids in a thin slit pore geometry. Beginning with the classical and dynamic density functional theories for systems of charged hard spheres, an asymptotic procedure leads to a simplified model which incorporates both the accurate resolution of the ion layering (perp...

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Veröffentlicht in:Journal of the Electrochemical Society 2022-12, Vol.169 (12), p.120513
Hauptverfasser: Tomlin, Ruben J., Roy, Tribeni, Kirk, Toby L., Marinescu, Monica, Gillespie, Dirk
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container_issue 12
container_start_page 120513
container_title Journal of the Electrochemical Society
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creator Tomlin, Ruben J.
Roy, Tribeni
Kirk, Toby L.
Marinescu, Monica
Gillespie, Dirk
description We study the dynamics of ionic liquids in a thin slit pore geometry. Beginning with the classical and dynamic density functional theories for systems of charged hard spheres, an asymptotic procedure leads to a simplified model which incorporates both the accurate resolution of the ion layering (perpendicular to the slit pore wall) and the ion transport in the pore length. This reduced-order model enables qualitative comparisons between different ionic liquids and electrode pore sizes at low numerical expense. We derive semi-analytical expressions for the impedance response of the reduced-order model involving numerically computable sensitivities, and obtain effective finite-space Warburg elements valid in the high and low frequency limits. Additionally, we perform time-dependent numerical simulations to recover the impedance response as a validation step. We investigate the dependence of the impedance response on system parameters and the choice of density functional theory used. The inclusion of electrostatic effects beyond mean-field qualitatively changes the dependence of the characteristic response time on the pore width. We observe peaks in the response time as a function of pore width, with height and location depending on the potential difference imposed. We discuss how the calculated dynamic properties can be used together with equilibrium results to optimise ionic liquid supercapacitors for a given application.
doi_str_mv 10.1149/1945-7111/ac89b5
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The inclusion of electrostatic effects beyond mean-field qualitatively changes the dependence of the characteristic response time on the pore width. We observe peaks in the response time as a function of pore width, with height and location depending on the potential difference imposed. We discuss how the calculated dynamic properties can be used together with equilibrium results to optimise ionic liquid supercapacitors for a given application.</description><identifier>ISSN: 0013-4651</identifier><identifier>EISSN: 1945-7111</identifier><identifier>DOI: 10.1149/1945-7111/ac89b5</identifier><identifier>CODEN: JESOAN</identifier><language>eng</language><publisher>IOP Publishing</publisher><subject>EDLC ; energy storage ; supercapacitors</subject><ispartof>Journal of the Electrochemical Society, 2022-12, Vol.169 (12), p.120513</ispartof><rights>2022 The Author(s). 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title Impedance Response of Ionic Liquids in Long Slit Pores
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