Application of the Cathode-Ray Oscilloscope to Polarographic Phenomena. I. Differential Capacity of the Electrical Double Layer.

1952 ◽  
Vol 56 (2) ◽  
pp. 250-255 ◽  
Author(s):  
J. West Loveland ◽  
Philip J. Elving
Keyword(s):  
Double Layer ◽  
Electrical Double Layer ◽  
Differential Capacity

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.

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

On the electrical double layer between mercury and aqueous solutions of sodium citrate

1985 ◽  
Vol 63 (9) ◽  
pp. 2462-2467 ◽  
Author(s):  
S. Gonzalez ◽  
S. V. Alvarez ◽  
A. Arévalo
Keyword(s):  
Aqueous Solutions ◽  
Double Layer ◽  
Electrical Double Layer ◽  
Sodium Citrate ◽  
Adsorption Process ◽  
Differential Capacity ◽  
Frumkin Isotherm ◽  
Citrate Ions

The adsorption of citrate ions at the Hg/aqueous CitNa3 interface was studied, using both differential capacity and electrocapillary measurements. The results contrast with those obtained previously by Barradas etal. The hump of the Cd–E curve increases as the concentration of the solution increases to 0.5 M, to diminish beyond 1 M. The plots of [Formula: see text] vs. q−1 are linear and parallel to one another for the different values of q, which is in agreement with the results obtained by other authors for different anions. A Frumkin isotherm is also associated for the adsorption process and, finally, the parameters are obtained for the interface, using a type of isotherm proposed by Grahame.

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