Electrode currents and concentrations for transfer by diffusion and chemical reaction

1968 ◽  
Vol 21 (8) ◽  
pp. 1953
Author(s):  
CHJ Johnson
Keyword(s):  
Weighting Function ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Graphical Form ◽  
Diffusion Field ◽  
Irreversible Reaction ◽  
Definite Integrals ◽  
Reaction Solution ◽  
Stable Species ◽  
Dropping Mercury Electrode

In the present paper we compute the time-dependent diffusion field around an electrode, which may be a plane or a sphere of constant radius, for an electrochemical system in which a single depolarizing species A through a rapid reversible electrode reaction gives rise to a transitory species B which is converted into a stable species C by a slow irreversible reaction solution. The mathematical solution method is such that by suitable choice of variables it is possible to solve the plane and sphere problems in one operation. The functions yielding concentrations and electrode currents are obtained as definite integrals which are evaluated numerically. By appropriate choice of weighting function the present results can be applied to the expanding sphere problem (dropping mercury electrode). The results are consistent with the spirit of the Ilkovic analysis. Numerical results for planar and spherical electrodes are presented in graphical form.

Admittance Behavior of Electrode Reaction of Water at a Dropping Mercury Electrode

1971 ◽  
Vol 44 (10) ◽  
pp. 2880-2880 ◽  
Author(s):  
Kiyoshi Matsuda ◽  
Katsuo Takahashi ◽  
Reita Tamamushi
Keyword(s):  
Mercury Electrode ◽  
Electrode Reaction ◽  
Dropping Mercury Electrode

Polarography of azobenzene and its p-sulphonic acids

1964 ◽  
Vol 17 (10) ◽  
pp. 1085 ◽  
Author(s):  
TM Florence ◽  
YJ Farrar
Keyword(s):  
Ph Effect ◽  
Aqueous Media ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Ammonium Ions ◽  
Current Time ◽  
Electrode Processes ◽  
Ph Values ◽  
Strong Adsorption ◽  
Dropping Mercury Electrode

The behaviour at the dropping mercury electrode of trans-azobenzene and its p-sulphonic acids has been studied by several techniques including d.c., a.c., single sweep, and Kalousek polarography. Current-potential curves recorded at the streaming mercury electrode provided information on the reversibility of the electrode processes, while current-time and electrocapillary curves aided in elucidating the effects of adsorption. The results show that the rate of the electrode reaction of the azo-hydrazo couple is dependent on pH, the minimum rate occurring near pH 9 for azobenzene-4-sulphonic acid in aqueous media. At very low and high pH values, the couple approaches full reversibility at the dropping mercury electrode. This pH effect is apparently due to strong adsorption of both the azo and hydrazo derivatives near the potential of the electrocapillary maximum. Ammonium ions associate with azobenzene-4-sulphonate, and improve the reversibility in intermediate pH regions.

The Electroreduction of Periodate Anion in Alkaline Media

1971 ◽  
Vol 49 (16) ◽  
pp. 2657-2663 ◽  
Author(s):  
W. R. Fawcett ◽  
Y. C. Kuo Lee
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Double Layer ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Alkaline Media ◽  
Dropping Mercury Electrode ◽  
Ph Range ◽  
Theoretical Developments

The electroreduction of periodate anion was studied at a dropping mercury electrode in aqueous solutions in the pH range 11–13.3 where the process is markedly affected by the double layer. The electrode reaction was found to be complex, its mechanism depending on both pH and ionic strength. The effects of the double layer on the component reactions are discussed with respect to current theoretical developments.

Application of Cyclic Chronopotentiometry to the Study of Slow Charge Transfer Reactions at the DME and the SMDE

1996 ◽  
Vol 61 (10) ◽  
pp. 1432-1444 ◽  
Author(s):  
Ángela Molina ◽  
Joaquín González ◽  
Carmen Serna
Keyword(s):  
Charge Transfer ◽  
Kinetic Parameters ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Time Response ◽  
Transfer Reactions ◽  
Formal Potential ◽  
Dropping Mercury Electrode ◽  
Charge Transfer Reactions ◽  
Reaction Equations

In this work we apply cyclic chronopotentiometry to analyze charge transfer reactions at spherical electrodes, highlighting the influence of electrode curvature and the formation of amalgam on the potential-time response. Moreover, methods are proposed for determining the formal potential and the kinetic parameters of the electrode reaction. Equations obtained for the dropping mercury electrode are transformed to those corresponding to a static mercury drop electrode and a plane electrode.

Kinetics of electrode reaction of Eu3+/Eu2+ studied by cyclic voltammetry and tast polarography

1990 ◽  
Vol 55 (7) ◽  
pp. 1666-1672 ◽  
Author(s):  
Jaroslav Němec ◽  
Tomáš Loučka
Keyword(s):  
Cyclic Voltammetry ◽  
Kinetic Parameters ◽  
Electrochemical Behaviour ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Dropping Mercury Electrode ◽  
Sulphate Media ◽  
First Time ◽  
Kinetics Of ◽  
The Eu

The electrochemical behaviour of europium at the dropping mercury electrode was studied in the medium of 1M-NaClO4, 1M-NaCl, 1M-NaNO3, and 1M-Na2SO4. The curves obtained by Tast polarography and the kinetic parameters (ks, α) for the Eu3+/Eu2+ system in the medium of perchlorate and chloride solutions are in accord with the results published earlier. The kinetic parameters in nitrate and sulphate media are given for the first time. In the medium of nitrates, the electrode reaction is probably accompanied by a chemical reaction.

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