Steady-state voltammetry at a microdisc electrode in the absence of excess supporting electrolyte for reversible, quasi-reversible and irreversible electrode kinetics

2012 ◽  
Vol 14 (42) ◽  
pp. 14635 ◽  
Author(s):  
Stephen R. Belding ◽  
Eduardo Laborda ◽  
Richard G. Compton
Keyword(s):  
Steady State ◽  
Supporting Electrolyte ◽  
Electrode Kinetics

Analysis of the Electrode Kinetics of Ni(II) Reduction in Thiocyanate Media on the Dropping Mercury Electrode

2000 ◽  
Vol 65 (3) ◽  
pp. 326-342
Author(s):  
María S. Crespo-Pinilla ◽  
Fernando Mata-Pérez ◽  
Rosa M. Villamañán
Keyword(s):  
Ionic Strength ◽  
Compensation Effect ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Electrode Kinetics ◽  
Surface Process ◽  
Experimental Conditions ◽  
Dropping Mercury Electrode ◽  
Kinetics Of

A study of two prewaves of the Ni(II)-SCN- system was carried out under the experimental conditions when the influence of electroreduction of SCN- is negligible. Kinetics of Ni(II) reduction in thiocyanate media on the dropping mercury electrode was studied by DC Tast Polarography (DCTP) via determination of Koutecký's parameter χ; the influence of different variables was analyzed. The study of prewaves was performed using various polarographic techniques. Values of χ depend on the SCN- concentration, pH, ionic strength (Ψ-effect) and on the nature of the supporting electrolyte. The number of electrons n, the transfer coefficient α, the stoichiometric number ν, ∆H≠, and ∆S≠ were determined (compensation effect). The first prewave has character of a reaction in the solution, the second prewave is a surface process. Main features of both mechanisms are common: catalytic nature, one-electron step discharge and the rate-determining process between species of opposite charges.

Steady-state voltammetry of strong and weak acids with and without supporting electrolyte

1992 ◽  
Vol 64 (20) ◽  
pp. 2372-2377 ◽  
Author(s):  
Malgorzata. Ciszkowska ◽  
Zbigniew. Stojek ◽  
Susan E. Morris ◽  
Janet G. Osteryoung
Keyword(s):  
Steady State ◽  
Supporting Electrolyte ◽  
Weak Acids

THEORIES OF DIFFUSION AT A MICRORING ELECTRODES: A REVIEW

2007 ◽  
Vol 06 (04) ◽  
pp. 699-713
Author(s):  
L. RAJENDRAN ◽  
G. RAHAMATHUNISSA ◽  
C. A. BASHA
Keyword(s):  
Steady State ◽  
Analytical Solutions ◽  
Numerical Solutions ◽  
Area Ratio ◽  
Diffusion Control ◽  
Electrode Kinetics ◽  
Steady State Current ◽  
Approximate Expressions

Microring electrodes are useful for the investigation of electrode kinetics due to their large perimeter-to-area ratio and compact nature but have hitherto been limited in application due to the absence of the underpinning theory. In this review, the analytical solutions, approximate expressions, and numerical solutions of transient chronoamperometric current at a microring electrode under diffusion control are discussed. The steady and non-steady-state current for microring electrode for an EC' reaction are also discussed. Tabular compilations of dimensionless current are provided.

Analysis of the electrode kinetics of Ni(II) reduction at the DME in the presence of nicotine

2000 ◽  
Vol 78 (5) ◽  
pp. 521-526 ◽  
Author(s):  
M S Crespo-Pinilla ◽  
A B Infante ◽  
F Mata-Pérez
Keyword(s):  
Surface Reaction ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Electrode Kinetics ◽  
Experimental Conditions ◽  
Opposite Charge ◽  
Nicotine Concentration ◽  
Dropping Mercury Electrode ◽  
Kinetics Of

A study of the prewave of the Ni2+ - nicotine system was carried out under the experimental conditions when the influence of electroreduction of nicotine is negligible. The kinetics of Ni(II) reduction in nicotine media on the dropping mercury electrode were studied by direct current Tast polarography (DCTP) via the determination of the Koutecky's parameter, χ and the influence of different variables was analyzed. An electrochemical study of the prewave was also made by using various polarographic techniques. Values of χ depend on the nicotine concentration, pH, ionic strength (ψ-effect), and on the nature of the supporting electrolyte. The αn product (χ = transfer coefficient, n = number of electrons) and the stoichometric number,v, were determined. The prewave is interpreted as a surface reaction, the main features of the mechanism being its catalytic nature. The discharge is a two electron step and reaction between species of opposite charge is rate-determining.Key words: catalytic, prewave, polarography, nickel(II), nicotine.

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