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arXiv 2201.11672cond-mat.softphysics.chem-ph
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长缝孔充电解质充电Poisson-Nernst-Planck方程的解析解

Analytical solution to the Poisson-Nernst-Planck equations for the charging of a long electrolyte-filled slit pore

Timur Aslyamov, Mathijs Janssen

摘要:

我们研究了一个长的电解质填充狭缝孔的充电动力学响应突然施加的电位。特别地,我们解析地求解了孔的泊松-能斯特-普朗克(PNP)方程,其中$λ_D\ll H\ll L$,其中$λ_D$为德拜长度,$H$和$L$为孔的宽度和长度。对于小的外加电位,我们发现随时间变化的电位降之间的孔隙的表面和它的中心是在与著名的传输线模型的预测完全一致。对于中等到高的施加电位,以前的数值工作表明,充电减慢在后期;我们的分析模型再现和解释这种双指数电荷积累。

英文摘要:

We study the charging dynamics of a long electrolyte-filled slit pore in response to a suddenly applied potential. In particular, we analytically solve the Poisson-Nernst-Planck (PNP) equations for a pore for which $λ_D\ll H\ll L$, with $λ_D$ the Debye length and $H$ and $L$ the pore's width and length. For small applied potentials, we find the time-dependent potential drop between the pore's surface and its center to be in complete agreement with a prediction of the celebrated transmission line model. For moderate to high applied potentials, prior numerical work showed that charging slows down at late times; Our analytical model reproduces and explains such biexponential charge buildup.

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