scholarly journals Theory of Square-wave Voltammetry of Kinetically Controlled Two-step Electrode Reactions

2012 ◽  
Vol 85 (4) ◽  
pp. 569-575 ◽  
Author(s):  
Milivoj Lovrić ◽  
Šebojka Komorsky-Lovrić
Keyword(s):  
Square Wave Voltammetry ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Kinetically Controlled

Isopotential points in square-wave voltammetry of reversible electrode reactions

2009 ◽  
Vol 74 (10) ◽  
pp. 1489-1501 ◽  
Author(s):  
Marina Zelić ◽  
Milivoj Lovrić
Keyword(s):  
Square Wave Voltammetry ◽  
Electrode Reaction ◽  
Time Model ◽  
Model Calculations ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Electron Transfer Processes ◽  
Diagnostic Criterion ◽  
First Time

Isopotential points in square-wave voltammetry are described for the first time. Model calculations and real measurements (performed with UO22+ and Eu3+ in perchlorate and bromide solutions, respectively) indicate that such an intersection could be observed when backward components of the net response, resulting from an increase in frequency or reactant concentration, are presented together. The electrode reaction should be fully reversible because quasireversible or slower electron transfer processes give the isopoints only at increasing reactant concentrations but not at increasing square-wave frequencies. The effect could be used as an additional diagnostic criterion for recognition of reversible electrode reactions where products remain dissolved in the electrolyte solution.

Single drop square wave polarography

1981 ◽  
Vol 59 (24) ◽  
pp. 3326-3333 ◽  
Author(s):  
Louis Ramaley ◽  
Wee Tee Tan
Keyword(s):  
Square Wave Voltammetry ◽  
Signal To Noise Ratio ◽  
Single Drop ◽  
Plane Model ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry ◽  
Average Current ◽  
The Times ◽  
Good Agreement

The theory of square wave voltammetry for reversible electrode reactions is expanded to include average currents and currents flowing to a growing drop (single drop square wave polarography) using an expanding plane model. Excellent agreement between theory and experiment was found for the reduction of Fe(III), good agreement for the reduction of Cd(II). The expanding plane model proved superior, but not greatly superior to the simpler theory. For the case of average current the effect on the polarogram of the times at which integration is started and stopped is discussed. Integration decreases sensitivity but increases signal-to-noise ratio. The conditions for maximum analytical usefulness are presented.

scholarly journals Characterizing electrode reactions by multisampling the current in square-wave voltammetry

2016 ◽  
Vol 213 ◽  
pp. 520-528 ◽  
Author(s):  
Valentin Mirceski ◽  
Dariusz Guziejewski ◽  
Monika Bozem ◽  
Ivan Bogeski
Keyword(s):  
Square Wave Voltammetry ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry

scholarly journals Simulation of square wave voltammetry of three electrode reactions coupled by two reversible chemical reactions

2017 ◽  
Vol 7 (3) ◽  
pp. 119
Author(s):  
Milivoj Lovrić
Keyword(s):  
Thermodynamic Parameters ◽  
Chemical Reactions ◽  
Square Wave Voltammetry ◽  
Equilibrium Constants ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry

<p style="margin: 0cm 0cm 8pt; line-height: 150%;"><span lang="EN-GB">Three fast and reversible electrode reactions that are connected by two reversible chemical reactions that are permanently in the equilibrium are analysed theoretically for square wave voltammetry. The dependence of peak potentials on the dimensionless equilibrium constants of chemical reactions is calculated. The influence of the basic thermodynamic parameters on the square wave voltammetric responses is analysed.</span></p>

Cyclic square wave voltammetry of electrode reactions with nonunity stoichiometry

2020 ◽  
Vol 873 ◽  
pp. 114421
Author(s):  
Eduardo Laborda ◽  
José María Gómez-Gil ◽  
Manuela López-Tenés ◽  
Angela Molina
Keyword(s):  
Square Wave Voltammetry ◽  
Square Wave ◽  
Electrode Reactions ◽  
Wave Voltammetry

scholarly journals Theory of Square-Wave Voltammetry of Two-Step Electrode Reaction Using an Inverse Scan Direction

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Milivoj Lovrić ◽  
Šebojka Komorsky-Lovrić
Keyword(s):  
Square Wave Voltammetry ◽  
Electrode Reaction ◽  
Reaction Step ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Kinetically Controlled ◽  
Two Peaks ◽  
Electron Transfers ◽  
Special Case ◽  
Unstable Intermediate

A theory of square-wave voltammetry of two-step electrode reaction with kinetically controlled electron transfers is developed, and a special case of thermodynamically unstable intermediate is analyzed. If the first reaction step is reversible and the second one is quasireversible, the response splits into two peaks if the scan direction is inverted. The separation of these peaks increases with frequency.

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