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Grand canonical Monte Carlo simulation results are reported for an electricdouble layer modelled by a planar charged hard wall, anisotropic shape cations,and spherical anions at different electrolyte concentrations and asymmetricvalencies. The cations consist of two tangentially tethered hard spheres of thesame diameter, $d$. One sphere is charged while the other is neutral. Sphericalanions are charged hard spheres of diameter $d$. The ion valency asymmetry 1:2and 2:1 is considered, with the ions being immersed in a solvent mimicked by acontinuum dielectric medium at standard temperature. The simulations arecarried out for the following electrolyte concentrations: 0.1, 1.0 and 2.0 M.Profiles of the electrode-ion, electrode-neutral sphere singlet distributions,the average orientation of dimers, and the mean electrostatic potential arecalculated for a given electrode surface charge, $\sigma$, while the contactelectrode potential and the differential capacitance are presented for varyingelectrode charge. With an increasing electrolyte concentration, the shape ofdifferential capacitance curve changes from that with a minimum surrounded bymaxima into that of a distorted single maximum. For a 2:1 electrolyte, themaximum is located at a small negative $\sigma$ value while for 1:2, at a smallpositive value.

condensed matter physics

Influence of anisotropic ion shape, asymmetric valency, and electrolyte  concentration on structural and thermodynamic properties of an electric  double layer