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

Clint Cagle, Guang Feng, Rui Qiao, Jingsong Huang, Bobby G. Sumpter, Vincent Meunier

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)703-708
Number of pages6
JournalMicrofluidics and Nanofluidics
Volume8
Issue number5
DOIs
StatePublished - May 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

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