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.

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.

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.

Adsorption and Condensation of Xanthine at the Mercury/Solution Interface

1998 ◽  
Vol 63 (12) ◽  
pp. 1977-1993 ◽  
Author(s):  
Viktor Dražan ◽  
Vladimír Vetterl
Keyword(s):  
Double Layer ◽  
Electrode Surface ◽  
Lattice Gas ◽  
Standard Gibbs Energy ◽  
Mercury Electrode ◽  
Ising Lattice ◽  
Compact Layer ◽  
Solution Interface ◽  
Double Layer Capacity ◽  
Lattice Gas Models

The adsorption and two-dimensional condensation of xanthine at the mercury electrode in 0.2 and 2 M NaCl was studied by electrode double layer capacity measurements. The condensation of xanthine molecules adsorbed at the electrode was observed at pH 6.0 and 7.4, but not at 9.0. The standard Gibbs energy of adsorption, energy of lateral interactions and the surface occupied by one xanthine molecule in a compact layer were calculated from the temperature dependence of the capacity pit using the Frumkin and Ising lattice gas models. The orientation of xanthine molecules in a compact layer at the electrode surface was estimated. At higher bulk concentrations of xanthine, the double layer capacity decreases to a very low value of about 1.5 mF cm-2, which might be an indication of the formation of a xanthine multilayer at the electrode surface.

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