scholarly journals Redox mediation at poly(o-aminophenol) coated electrodes: Mechanistic diagnosis from steady state polarization curves

2018 ◽  
Author(s):  
Gabriel Ybarra ◽  
Carlos Moina ◽  
María Inés Florit ◽  
Dionisio Posadas
Keyword(s):  
Steady State ◽  
Polarization Curve ◽  
Experimental Measurements ◽  
Steady State Current ◽  
Thermodynamical Parameters ◽  
Reduction And Oxidation ◽  
Mediated Reduction ◽  
Coated Electrodes ◽  
Current Potential ◽  
Potential Curves

<p class="PaperAbstract"><span lang="EN-US">In this work, the mediated reduction and oxidation of Fe(CN)<sub>6</sub><sup>3-/4-</sup> and Fe<sup>3+ </sup>in poly(o-aminophenol) coated electrodes is analyzed by means of diagnosis diagram based on the features of steady state current-potential curves. This analysis allows to identify the current determining process and to reproduce the experimental characteristics of the polarization curve from the relevant kinetic and thermodynamical parameters with a minimum amount of experimental measurements. </span></p>

scholarly journals Redox mediation at poly(o-aminophenol) coated electrodes: mechanistic diagnosis from steady state polarization curves

2018 ◽  
Vol 8 (4) ◽  
pp. 271-280
Author(s):  
Gabriel Ybarra ◽  
Carlos Moina ◽  
María Inés Florit ◽  
Dionisio Posadas
Keyword(s):  
Steady State ◽  
Thermodynamic Parameters ◽  
Polarization Curve ◽  
Experimental Measurements ◽  
Kinetic And Thermodynamic Parameters ◽  
Steady State Current ◽  
Mediated Reduction ◽  
Coated Electrodes ◽  
Current Potential ◽  
Potential Curves

In this work, the mediated reduction of Fe(CN)63- and Fe3+ in poly(o-aminophenol) coated electrodes is analyzed by means of a diagnosis diagram based on the features of the steady state current-potential curves. This analysis allows to identify the current determining process and to reproduce the experimental characteristics of the polarization curve from the relevant kinetic and thermodynamic parameters with a minimum amount of experimental measurements.

Electrochemical Response to Dissolved Hydroquinone on Insulating Polyaniline-modified Electrode in Less Acidic Solution and Enhancement of the Conductivity of Polyaniline

2012 ◽  
Vol 15 (4) ◽  
pp. 237-239
Author(s):  
Jun Yano
Keyword(s):  
Modified Electrode ◽  
Acidic Solution ◽  
Conductive Polymer ◽  
Pani Film ◽  
Buffer Solution ◽  
Dissolved Species ◽  
Steady State Current ◽  
Electro Oxidation ◽  
Current Potential ◽  
Potential Curves

A conductive polymer, polyaniline (PANI), was easily prepared on an electrode surface as a stable film by the electropolymerization of aniline in acidic solution. In McIlvain’s buffer solution with a pH that exceeded 4, no redox current by the dissolved species was observed on the PANI-modified electrode because PANI acted as an electric insulator. However, in a less acidic solution, the redox current of the dissolved hydroquinone was evident because hydroquinone selectively permeates through the PANI film to reach the electrode substrate. The results of steady-state current-potential curves for the oxidation of hydroquinone using a PANI pellet electrode revealed that hydroquinone was concentrated in the PANI during the electro-oxidation. Furthermore, the concentration of hydroquinone increased the electric conductivity of the PANI from 6.50×10-7 S/cm to 2.73×10-3 S/cm.

scholarly journals Transient Current Density in a Pair of Long Parallel Conductors

2021 ◽  
Vol 11 (15) ◽  
pp. 6920
Author(s):  
Oldřich Coufal
Keyword(s):  
Steady State ◽  
Cross Section ◽  
Current Density ◽  
Circular Cross Section ◽  
Transient Current ◽  
Constant Current ◽  
Voltage Source ◽  
Sinusoidal Voltage ◽  
Steady State Current ◽  
Maximum Current

Two infinitely long parallel conductors of arbitrary cross section connected to a voltage source form a loop. If the source voltage depends on time, then due to induction there is no constant current density in the loop conductors. It is only recently that a method has been published for accurately calculating current density in a group of long parallel conductors. The method has thus far been applied to the calculation of steady-state current density in a loop connected to a sinusoidal voltage source. In the present article, the method is used for an accurate calculation of transient current using transient current density. The transient current is analysed when connecting and short-circuiting the sources of sinusoidal, constant and sawtooth voltages. For circular cross section conductors, the dependences of maximum current density, maximum current and the time of achieving steady state on the source frequency, the distance of the conductors and their resistivity when connecting the source of sinusoidal voltage are examined.

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