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Springer Verlag, Microfluidics and Nanofluidics, 5(8), p. 703-708

DOI: 10.1007/s10404-009-0542-2

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Structure and charging kinetics of electrical double layers at large electrode voltages

Journal article published in 2009 by Clint Cagle, Guang Feng ORCID, Rui Qiao ORCID, Jingsong Huang ORCID, Bobby G. Sumpter ORCID, Vincent Meunier ORCID
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This paper is available in a repository.

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Abstract

The structure and charging kinetics of electrical double layers (EDLs) at interfaces of NaCl solutions and planar electrodes are studied by molecular dynamics (MD) and Poisson–Nernst–Planck (PNP) simulations. Based on the MD results and prior experimental data, we show that counterion packing in planar EDLs does not reach the steric limit at electrode voltages below 1 V. In addition, we demonstrate that a PNP model, when complemented with a Stern model, can be effectively used to capture the overall charging kinetics. However, the PNP/Stern model can only give a qualitative description of the fine features of the EDL.