title: The planar electric double layer capacitance for the solvent primitive model electrolyte.
abstract: The planar electric double layer capacitance of the solvent primitive model electrolyte is studied using simulation and two versions of the modified Poisson-Boltzmann theory. At small values of the surface charge and varying electrolyte concentration, the capacitance has a behaviour analogous to that of the restricted primitive model electrolyte. As the electrolyte concentration is increased at a fixed total packing fraction, the minimum at zero surface charge changes to a maximum. This qualitative change is predicted by both simulation and the modified Poisson-Boltzmann theories. The transition envelope, separating the change in the capacitance from a minimum to a maximum at zero surface charge, is shifted from the restricted primitive model value to higher ion densities at fixed total packing fractions.
authors.affiliation: Department of Physical Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznań, Umultowska 89b, 61-614 Poznań, Poland. c.w.outhwaite@sheffield.ac.uk.
authors.forename: Stanisław
authors.initials: S
authors.lastname: Lamperski
authors.forename: Monika
authors.initials: M
authors.lastname: Płuciennik
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Outhwaite