scholarly journals standard rate constant of an electrode reaction

2008 ◽  
Keyword(s):  
Rate Constant ◽  
Electrode Reaction ◽  
Standard Rate ◽  
Standard Rate Constant

scholarly journals Simulation of Alternative Differential Multi-pulse Voltammetry. Evaluation of the Electrochemical Reversibility by the Voltammogram Symmetry

2019 ◽  
Vol 92 (1) ◽  
pp. 95-102
Author(s):  
Dijana Jadreško
Keyword(s):  
Electron Transfer ◽  
Transfer Reaction ◽  
Electrode Reaction ◽  
Electron Transfer Reaction ◽  
Electrode Reactions ◽  
Electrochemical Reversibility ◽  
Kinetically Controlled ◽  
Standard Rate ◽  
Pulse Voltammetry ◽  
Standard Rate Constant

A theoretical analysis of reversible and kinetically controlled electrode reactions in conditions of alternative differential multi-pulse voltammetry (ADMPV) is presented. The degree of reversibility, as well as symmetry of the electron transfer reaction, can be estimated by visual inspection of the ADMP voltammogram. The values of electron transfer coefficient and the standard rate constant of a simple electrode reaction Ox + ne− ⇄ Red, can be determined from the slope of linear dependence of the peak currents ratio on the logarithm of pulse duration. The criteria for recognition of reversible and kinetically controlled electrode reactions by alternative differential multi-pulse voltammetry are given.

ChemInform Abstract: THE STANDARD RATE CONSTANT OF THE EXCHANGE SB(III) + 3E = SB(HG)

1975 ◽  
Vol 6 (17) ◽  
pp. no-no
Author(s):  
A. A. MOUSSA ◽  
M. M. ABOU-ROMIA ◽  
H. A. GHALY
Keyword(s):  
Rate Constant ◽  
Standard Rate ◽  
Standard Rate Constant

The standard rate constant of the exchange Sb(III) + 3e ⇌ Sb(Hg)

1974 ◽  
Vol 19 (12) ◽  
pp. 957-958 ◽  
Author(s):  
A.A. Moussa ◽  
M.M. Abou-Romia ◽  
H.A. Ghaly
Keyword(s):  
Rate Constant ◽  
Standard Rate ◽  
Standard Rate Constant

Electroreduction of Cr(VI) from solutions of bifunctional alcohols

1989 ◽  
Vol 54 (10) ◽  
pp. 2638-2643
Author(s):  
David I. Balanchivadze ◽  
Tamara R. Chelidze ◽  
Jondo J. Japaridze
Keyword(s):  
Activation Energy ◽  
Ethylene Glycol ◽  
Electrode Surface ◽  
Frequency Factor ◽  
Limiting Current ◽  
Factor Log ◽  
Standard Rate ◽  
Standard Rate Constant ◽  
Chromate Ion ◽  
Activation Energy Of Diffusion

The effect of bifunctional alcohols ethylene glycol (EG) and 1,2-propylene glycol (1,2 PG) on the kinetic parameters for the irreversible chromate ion reduction were investigated by polarographic and coulometric methods of analysis. The electroreduction of chromate ion in neutral bifunctional alcohol solutions proceeds according to the scheme: Cr(VI)–Cr(III)–Cr(II) and the values of the standard rate constant k*0 decrease in the order H2O > EG > 1,2 PG. The values of real activation energy, Q, activation energy of diffusion, QD, and frequency factor log A° have been calculated. The obtained values of QD as well as Q proved the diffusion nature of limiting current. The values of the frequency factor log A° decrease in the order H2O > EG > 1,2 PG, which points to a less favourable orientation of the electroactive ions at the electrode surface in glycols.

Voltammetric investigation of the kinetics of alkali metal cation reduction in N,N-dimethylformamide

1975 ◽  
Vol 28 (2) ◽  
pp. 237 ◽  
Author(s):  
JW Diggle ◽  
AJ Parker ◽  
DA Owensby
Keyword(s):  
Electron Transfer ◽  
Alkali Metal ◽  
Propylene Carbonate ◽  
Rate Constant ◽  
Alkali Metal Cation ◽  
Electrode Reaction ◽  
Amalgam Electrode ◽  
Kinetics Of ◽  
Dipolar Aprotic Solvents

The standard electron-transfer heterogeneous rate constant of lithium, potassium, sodium and caesium amalgams in N,N-dimethylformamide was ascertained employing cyclic voltammetry in an effort to relate the presence of a non-equilibrium electrode reaction at the dropping lithium amalgam electrode to the variation of the lithium amalgam electrode potential with amalgam electrode con- figuration, i.e. whether streaming, dropping or stationary. Such variations are not observed at other alkali metal amalgam electrodes. ��� In the dipolar aprotic solvents the standard electron-transfer heterogeneous rate constant for the Li(Hg) electrode increases as the solvating power for Li+ decreases, i.e. dimethyl sulphoxide < di- methylformamide < propylene carbonate. Water is a much stronger solvator of Li+ than is propylene carbonate, but the electron transfer is faster in water than in propylene carbonate; the important role of entropic contributions in ion solvation is discussed as an explanation.

The electrochemical behavior of flavin adenine dinucleotide in neutral solutions

1988 ◽  
Vol 66 (1) ◽  
pp. 86-96 ◽  
Author(s):  
V. I. Birss ◽  
H. Elzanowska ◽  
R. A. Turner
Keyword(s):  
Electrochemical Behavior ◽  
Electrode Surface ◽  
Flavin Adenine Dinucleotide ◽  
Cyclic Voltammetric ◽  
Kinetics Of Oxidation ◽  
Glassy Carbon Electrodes ◽  
Peak Separation ◽  
Standard Rate ◽  
Kinetics Of ◽  
Standard Rate Constant

A detailed investigation of the electrochemical behavior of flavin adenine dinucleotide (FAD) in neutral solutions has been carried out at Hg and glassy carbon electrodes. At FAD concentrations of about 10−4 M, cyclic voltammetry (CV) shows a pair of anodic and cathodic peaks having a peak separation at low sweep rates indicative of a two-electron transfer process and yielding a formal redox potential for FAD of −0.206 ± 0.003 V vs. NHE at pH 7. Evidence for FAD adsorption was obtained in experiments at high sweep rates, from the effect of time of exposure of the electrode surface to FAD in solution and from the effect of the potential limits on the cyclic voltammetric response. The process of FAD adsorption was studied in detail in dilute FAD solutions (ca 10−6 M) using a hanging mercury drop electrode and the techniques of CV and ac voltammetry. Three distinct stages of FAD adsorption were observed and a model of the orientation of FAD on the electrode surface as a function of time and potential is presented. In addition, the kinetics of oxidation and reduction of adsorbed FAD was studied for each of the stages of FAD deposition, and a surface standard rate constant of ca. 40 s−1 was obtained for Stages II and III of FAD adsorption.

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