Oscillographic polarography with rectangular alternating current. II. Measurement of differential capacity of electrode double-layer

1965 ◽  
Vol 30 (12) ◽  
pp. 4280-4286 ◽  
Author(s):  
R. Kalvoda
Keyword(s):  
Double Layer ◽  
Alternating Current ◽  
Differential Capacity ◽  
Oscillographic Polarography

The diffuse double layer in ionic liquids

2009 ◽  
Vol 74 (11-12) ◽  
pp. 1665-1674 ◽  
Author(s):  
W. Ronald Fawcett ◽  
Peter J. Ryan
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Double Layer ◽  
Room Temperature ◽  
Potential Drop ◽  
Diffuse Double Layer ◽  
Differential Capacity ◽  
Monte Carlo Data ◽  
Monovalent Ions ◽  
Salt Systems

The equations used to describe the diffuse double layer in the Eigen–Wicke model of ionic liquids are presented. They are then used to estimate the potential drop across the diffuse layer and its differential capacity for two representative systems which contain monovalent ions of equal diameter. The first one is molten RbCl at 750 °C. The second system is a room temperature ionic liquid with typical parameters to describe its properties. The results of the calculations are compared with the available experimental data. It is concluded that the Eigen–Wicke model does not consider the change in local potential experienced by a given ion in the ionic liquid. The need for Monte Carlo data for the diffuse double layer in molten salt systems is emphasized.

Differential Capacity of the Double-Layer Formed at a Solid Electrode (Pt, Au)/Ionic Liquid Interface

2007 ◽  
Vol 62 (3-4) ◽  
pp. 187-190 ◽  
Author(s):  
Andrzej Lewandowski ◽  
Maciej Galiński ◽  
Sebastian R. Krajewski
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Double Layer ◽  
Electrode System ◽  
Liquid Interface ◽  
Potential Range ◽  
Differential Capacity ◽  
Impedance Measurements ◽  
Solid Electrode ◽  
Double Layer Capacity

The differential capacity at the electrode (Pt, Au)/ionic liquid interface of 18 ionic liquids (ILs), was measured applying chronoamperometry. The measurements were done by a two electrode system. The double layer capacity at the Pt/IL and Au/IL interface was 1 - 8 μF/cm2. The capacity, estimated from the impedance measurements, was approximately constant within a potential range of ca. 3 V.

The structure of the electrical double layer in the presence of adsorbed organic molecules

1961 ◽  
Vol 264 (1316) ◽  
pp. 133-144 ◽  
Keyword(s):  
Double Layer ◽  
Electrical Double Layer ◽  
Organic Molecules ◽  
Virial Equation ◽  
Differential Capacity ◽  
Free Energy Of Adsorption ◽  
High Coverage ◽  
Virial Equation Of State ◽  
Capacity Data ◽  
Good Agreement

On the model of the electrical double layer previously proposed by the author, equations are derived for the differential capacity of the metal/electrolyte interface in the presence of organic molecules. It is shown that the equations apply even when ions are specifically adsorbed. A method of calculating the amount of adsorption of the organic species from differential capacity data is outlined and applied to published results for thiourea at the mercury aqueous sodium fluoride interface. It is shown that the results are in good agreement with thermodynamic data. From the calculated adsorption d a ta it is shown that thiourea obeys a virial equation of state but that lateral electrostatic forces are probably negligible except at high coverage. The free energy of adsorption as a function of charge has been evaluated and shown to consist of an electrostatic term and a chemical term which decreases as the electron density of the mercury surface decreases.

Adsorption of tetramethylthiourea in concentrated NaClO4 solutions

2009 ◽  
Vol 74 (9) ◽  
pp. 1309-1321 ◽  
Author(s):  
Dorota Sieńko ◽  
Dorota Gugała-Fekner ◽  
Jolanta Nieszporek ◽  
Zygmunt Fekner ◽  
Jadwiga Saba
Keyword(s):  
Double Layer ◽  
Interaction Parameter ◽  
Mercury Electrode ◽  
Differential Capacity ◽  
Surface Excess

Tetramethylthiourea electrosorption behaviour on the mercury electrode in 2, 3 and 4 mol l–1 NaClO4 was determined by means of double-layer differential capacity measurements. The relative surface excess Γ′ of the adsorbate calculated from the surface pressures depended on the NaClO4 concentration. A clear influence of NaClO4 concentration appeared in the changes of interaction parameter A obtained from the Flory–Huggins isotherm and in the permittivity parameter of the inner layer.

Differential capacity of the mercury electrode in dilute 1,1-valent electrolytes

1982 ◽  
Vol 47 (1) ◽  
pp. 190-195
Author(s):  
Valerii Kozlov ◽  
Valentina Vilinskaya ◽  
Gurami Tedoradze
Keyword(s):  
Double Layer ◽  
Mercury Electrode ◽  
Electrolyte Solutions ◽  
Differential Capacity ◽  
Double Layer Capacity

The double layer capacity has been measured in dilute 1,1-valent electrolyte solutions (HCl, KCl, NaF) at infrasonic frequencies. The results obtained confirm the validity of the Gouy-Chapman theory for electrolyte solutions in the concentration range 10-3 - 10-5 mol/dm3.

The Differential Capacity of the Electrical Double Layer. The Role of the Anion

1952 ◽  
Vol 74 (17) ◽  
pp. 4422-4425 ◽  
Author(s):  
D. C. Grahame ◽  
M. A. Poth ◽  
J. I. Cummings
Keyword(s):  
Double Layer ◽  
Electrical Double Layer ◽  
Differential Capacity
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