A distinguishing of adsorption–catalyzed and regular part of faradaic current for inorganic cation–organic adsorbate system: probabilistic curves in cyclic voltammetry and normal pulse polarography

2004 ◽  
Vol 6 (8) ◽  
pp. 753-756 ◽  
Author(s):  
Przemysław Sanecki
Keyword(s):  
Cyclic Voltammetry ◽  
Regular Part ◽  
Faradaic Current ◽  
Pulse Polarography ◽  
Inorganic Cation

A simple method for the optimization of the decay time in pulse polarography

1988 ◽  
Vol 53 (6) ◽  
pp. 1149-1155
Author(s):  
Jorge A. Bolzan
Keyword(s):  
Double Layer ◽  
Decay Time ◽  
Sampling Time ◽  
Simple Method ◽  
Faradaic Current ◽  
Maximum Value ◽  
Pulse Polarography ◽  
Null Value ◽  
Polarographic Current

A simple method for optimization of the minimum decay time, previous to the sampling time of the polarographic current, is described. The former should make compatible two requisites: it should be short enough for obtaining the maximum value of the faradaic current and long enough for the minimum or null value of the double layer decay current. The method is performed with the pulse polarograph only, without ancillary instruments, is fast and its accuracy is fairly comparable with earlier methods, which were more accurate but by far more involved to perform.

Numerical Resolving of Net Faradaic Current in Fast-Scan Cyclic Voltammetry Considering Induced Charging Currents

2020 ◽  
Vol 92 (23) ◽  
pp. 15412-15419
Author(s):  
Gabriel Wosiak ◽  
Dyovani Coelho ◽  
Evaldo B. Carneiro-Neto ◽  
Ernesto C. Pereira ◽  
Mauro C. Lopes
Keyword(s):  
Cyclic Voltammetry ◽  
Fast Scan Cyclic Voltammetry ◽  
Faradaic Current

Effect of the Solvent Basicity and Additives on the Electroreduction of Picric Acid and Tetramethylammonium Picrate in Aprotic Media

1997 ◽  
Vol 62 (4) ◽  
pp. 581-596 ◽  
Author(s):  
Pavel Janderka ◽  
Oldřich Fischer ◽  
Eva Fischerová
Keyword(s):  
Cyclic Voltammetry ◽  
Reduction Potential ◽  
Electrochemical Behaviour ◽  
Picric Acid ◽  
Strong Acid ◽  
Proton Acceptor ◽  
Reduction Mechanism ◽  
Basic Alumina ◽  
Pulse Polarography ◽  
Solvent Basicity

The electroreduction of picric acid and tetramethylammonium picrate in acetonitrile, acetone, N,N-dimethylformamide, dimethyl sulfoxide and hexamethylphosphoramide has been studied by normal pulse polarography, cyclic voltammetry and by coulometric analysis. The reduction of undissociated acid starts in all aprotic media with consumption of one electron. The reduction potential is shifted to more negative potentials with rising basicity of the solvent, i.e. with rising dissociation constant of picric acid. The formation of anion radicals is followed by the sequence of acido-basic selfprotonation reactions as well as by the disproportionation leading to a nitroso intermediate. The reduction mechanism does not change by addition of proton acceptor (basic alumina) or by amfiprotic species (anthranilic acid). In the presence of a strong acid, picric acid can mediate the electroreduction of added protons. Proposed mechanisms were supported by comparison with electrochemical behaviour of related nitrophenols in the same aprotic media.

Electrochemical reduction of benzenediazonium salts in aprotic medium

1989 ◽  
Vol 54 (6) ◽  
pp. 1496-1507
Author(s):  
Pavel Janderka ◽  
Igor Cejpek
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Reduction ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Reduction Mechanism ◽  
Aprotic Medium ◽  
Pulse Polarography ◽  
Dc Polarography ◽  
Donor Numbers

DC polarography, TAST polarography, differential pulse polarography, polarography with superimposed alternating current, slow cyclic voltammetry with a hanging Hg drop electrode and a Pt electrode, rapid cyclic voltammetry with a hanging Hg drop, and coulometry were used to study the electrochemical reduction of p-methoxy- and p-nitrobenzenediazonium cations in aprotic medium. A reduction mechanism involving two separate one-electron steps is proposed, the first of which being complicated by adsorption and follow-up chemical reaction leading to evolution of nitrogen. The basicity of the aprotic solvents, expressed by donor numbers according to Gutman, influences the reduction mechanism of these cations.

Electrochemical Behaviour of 3-Pyridyl-N,N-bis[(8-quinolyl)amino]methane

1993 ◽  
Vol 58 (6) ◽  
pp. 1279-1284
Author(s):  
Angeles Loeches ◽  
Carmen Teijeiro ◽  
Dolores Marín
Keyword(s):  
Cyclic Voltammetry ◽  
Limit Of Detection ◽  
Electrochemical Behaviour ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Reduction Mechanism ◽  
Pulse Polarography ◽  
Dc Polarography ◽  
The Waves

3-Pyridyl-N,N-bis[(8-quinolyl)amino]methane was studied by DC polarography, coulometry, cyclic voltammetry and differential pulse polarography in a system comprising Britton-Robinson buffer and 15 vol.% ethanol at pH 7.0. The nature of the waves was investigated, and the reduction mechanism is suggested. DPP was also used for a quantitative determination of the substance, and a limit of detection of 3 μmol l-1 was obtained.

Influence of substituents on electrochemical reduction potentials of benzenediazonium salts

1989 ◽  
Vol 54 (12) ◽  
pp. 3135-3143 ◽  
Author(s):  
Pavel Janderka ◽  
Igor Cejpek
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Reduction ◽  
Linear Correlation ◽  
Structural Parameters ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Reduction Potentials ◽  
Pulse Polarography ◽  
Substituent Constants ◽  
Influence Of Substituents

TAST polarography, differential pulse polarography, and cyclic voltammetry on a hanging mercury drop and on a platinum disc were employed to measure the electrochemical reduction potentials of nine para substituted benzenediazonium salts in dimethylformamide. A satisfactory linear correlation was obtained between the potentials of the adsorption prewave and the substituent constants σ+p. The influence of substituents on some structural parameters was studied by using the CNDO/2 method for both a closed and a opened shell.

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