Frumkin double-layer corrections applied to the heterogeneous rate constants for cadmium(II) evaluated by alternating current polarography

1967 ◽  
Vol 39 (13) ◽  
pp. 1669-1671 ◽  
Author(s):  
J. D. McLean ◽  
Andrew. Timnick
Keyword(s):  
Double Layer ◽  
Rate Constants ◽  
Alternating Current

Theory of alternating current polarography. III. Frequency of alternating field and reaction rate

1955 ◽  
Vol 8 (3) ◽  
pp. 322 ◽  
Author(s):  
B Breyer ◽  
HH Bauer ◽  
S Hacobian
Keyword(s):  
Rate Constants ◽  
Reaction Rate ◽  
Electrode Reaction ◽  
Alternating Current ◽  
First Order ◽  
Electrode Reactions ◽  
Polarographic Current

The equation of the A.C. polarographic current for processes where the frequency of the alternating field is comparable with the rate of the electrode reaction is derived. Relative values of equilibrium rate constants of some first order electrode reactions are evaluated experimentally.

The Electroreduction of Substituted Benzofurazans

1972 ◽  
Vol 50 (2) ◽  
pp. 263-269 ◽  
Author(s):  
W. R. Fawcett ◽  
P. A. Forte ◽  
R. O. Loutfy ◽  
J. M. Prokipcak
Keyword(s):  
Electron Transfer ◽  
Molecular Orbital ◽  
Double Layer ◽  
Rate Constants ◽  
Hyperfine Splitting ◽  
Platinum Electrode ◽  
Hückel Theory ◽  
Layer Effect ◽  
Standard Rate ◽  
Anion Radicals

The electroreduction of 4- and 5-substituted benzofurazans was investigated at a platinum electrode in acetonitrile. Standard potentials for the reactions were linearly related to the energy of the lowest vacant molecular orbital as estimated by Hückel theory. Standard rate constants for electron transfer decreased as standard potentials in the series became more cathodic. This decrease is attributed to a double layer effect. No correlation was obtained between standard rate constants and observed hyperfine splitting constants for the anion radicals.

scholarly journals Studying electric double layer under sorption of gold on activated carbons from thiocarbamide solutions

2021 ◽  
Vol 24 (6) ◽  
pp. 1337-1346
Author(s):  
V. V. Elshin ◽  
Yu. E. Golodkov
Keyword(s):  
Double Layer ◽  
Direct Current ◽  
Electric Double Layer ◽  
Activated Carbons ◽  
Alternating Current ◽  
Gold Deposition ◽  
Polarization Current ◽  
Sorbent Surface ◽  
Conductometric Method ◽  
Thick Part

The purpose of the article is to research the mechanism of gold-thiocarbamide complex sorption by activated carbons by studying the properties of the resulting electric double layer. The study of the electric double layer of coal sorption surface is conducted using a polar conductometric method based on the simultaneous use of polarization dependences on direct current and conductometric measurements on alternating current. It is shown that the sorption of thiocarbamide complexes of gold occurs more intensively at the cathodic values of sorbent potentials. Dependence of the adsorption value on the potential is actually linear in the negative region from 0.05 to 0.2 V. The absolute value of goldthiocarbamide sorption at the negative sorbent potential of 0.2 V coincides with the maximum values of the polarization current for direct current and conductivity for alternating current. The electrochemical reduction reaction of thiocarbamide compounds results in the formation of neutral thiocarbamide molecules, it might be the reason for gold deposition in a metallic form on the surface of the carbon sorbent. Neutralization of active compounds in the electric double layer creates conditions for the activation of positively charged gold ions directing to the negatively charged sorbent surface. The anodic region of sorbent polarization is characterized by the maximum values of gold ion sorption at the positive potential of 0.2 V. In this case the sorbent surface should be recharged, since in the same region of the potential the maximum AC conductivity is observed. Such conditions should lead to the destruction of the thick part of the electric double layer and, consequently, create favorable sorption conditions. The conducted studies allowed to derive a conclusion that the sor ption of gold-thiocarbamide complexes by activated carbons is significantly influenced by the sorbent potential. The use of the polar conductometric method for studying the electric double layer makes it possible to explain the features of given compound sorption on activated carbons.

Electrode kinetics of the system V(III)/V(II) in aqueous dimethylsulphoxide

1991 ◽  
Vol 56 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Libuše Kišová ◽  
Libor Reichstädter ◽  
Jaro Komenda
Keyword(s):  
Organic Solvent ◽  
Double Layer ◽  
Rate Constants ◽  
Electrode Surface ◽  
Reaction Rate ◽  
Mercury Electrode ◽  
Electrode Reaction ◽  
Electrode Kinetics ◽  
Kinetics Of ◽  
Lower Basicity

The rate constants for the reduction of V(III) and oxidation of V(II) were measured on a mercury electrode in water and water-dimethylsulphoxide mixtures. Their dependance on the concentration of DMSO differs from that in mixtures of water with an organic solvent of lower basicity. This can be attributed to the existence of different solvates of vanadium in solutions and to different values of the rate constant for these solvates on the electrode surface at different coverages with the organic component. The influence of DMSO both in the primary solvation sphere and in the electrode double layer on the electrode reaction rate is discussed.

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