scholarly journals Numerical Simulation of Electrochemical Processes at a Tubular Electrode. Application to Spectroscopy

2008 ◽  
Vol 13 (2) ◽  
pp. 191-199 ◽  
Author(s):  
O. V. Klymenko ◽  
J. Kulys
Keyword(s):  
Numerical Simulation ◽  
Optical Fibers ◽  
Linear Sweep Voltammetry ◽  
Cell Design ◽  
Linear Sweep ◽  
Electrochemical Processes ◽  
Working Electrode ◽  
Tubular Electrode

A model of spectroelectrochemical cell design based on a tubular working electrode with optical fibers connected to a spectrometer entering it from two ends is built. Both current and absorbance responses of the cell are numerically simulated and the operation regimes are determined in terms of ranges of governing parameters for chronoamperometry and linear sweep voltammetry.

Numerical Simulation of Alternating Current Linear Sweep Voltammetry at Microdisc Electrodes

2001 ◽  
Vol 66 (2) ◽  
pp. 255-275 ◽  
Author(s):  
David J. Gavaghan ◽  
Darrell M. Elton ◽  
Alan M. Bond
Keyword(s):  
Numerical Simulation ◽  
Diffusion Coefficient ◽  
Linear Sweep Voltammetry ◽  
Sweep Rate ◽  
Two Dimensions ◽  
Minor Effect ◽  
Linear Sweep ◽  
Dimensional Parameter ◽  
Ac Response ◽  
Microdisc Electrodes

We extend our earlier work on the numerical simulation of ac linear sweep voltammetry at macroelectrodes to the case of microdisc electrodes. This requires the solution of the underlying diffusional transport equations in two dimensions, rather than one, using a cylindrical coordinate system. We use the two-dimensional FIRM algorithm combined with a specially designed exponentially expanding mesh. We examine the ac response as a function of the frequency and amplitude of the ac signal, and as a function of the non-dimensional parameter p = (nFa2v/RTD)1/2, where a is electrode radius, v the sweep rate, and D the diffusion coefficient. Results are analysed using Fast Fourier Transform (FFT) methods. We are able to derive a range of conditions under which radial diffusion has only a minor effect on the ac response of the system. The analytical results available for macroelectrodes therefore carry through to the microelectrode case for many practical ranges of system parameters (electrode size, dc sweep rate and diffusion coefficient). Experimental results are given which show good agreement with the numerical simulations.

Linear sweep voltammetry at the tubular electrode: Theory of EC2 mechanisms

2006 ◽  
Vol 591 (2) ◽  
pp. 133-140 ◽  
Author(s):  
Ian Streeter ◽  
Mary Thompson ◽  
Richard G. Compton
Keyword(s):  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Tubular Electrode

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

scholarly journals Electrochemical Approaches for Rapid Characterization of Oxidizable Compounds in Different Oak Alternatives

Beverages ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Jéremie Wirth ◽  
Davide Slaghenaufi ◽  
Stéphane Vidal ◽  
Maurizio Ugliano
Keyword(s):  
Linear Sweep Voltammetry ◽  
Wine Industry ◽  
Wine Aroma ◽  
Total Current ◽  
Strong Correlations ◽  
Tannin Content ◽  
Linear Sweep ◽  
Antioxidant Characteristics ◽  
Rapid Characterization

Oak alternatives (OAs) such as chips, granulates or staves, are becoming increasingly used in the wine industry. Although they are mostly considered for their contribution to wine aroma, they are also a source of phenolic compounds to be released in the wine, in particular ellagitannins contributing to wine mouthfeel and antioxidant characteristics. In the present study, we explore the potential for a rapid analytical method based on linear sweep voltammetry (LSV) combined with disposable sensors to provide a rapid measure of the oxidizable compounds present in different OAs, as well as their characterization. Strong correlations were found between the tannin content of different OAs and the total current measures during LSV analysis, allowing a rapid quantification of the oxidizable compounds present, mostly ellagitannin. Application of derivatization to raw voltammograms allowed extraction of a number of features that can be used for classification purposes, in particular with respect to OAs types (chips or staves) and degree of toasting.

The cathodic reduction of PbO in the passive layer on lead in aqueous sulphuric acid

1984 ◽  
Vol 62 (3) ◽  
pp. 596-600 ◽  
Author(s):  
R. G. Barradas ◽  
D. S. Nadezhdin
Keyword(s):  
Experimental Data ◽  
Three Dimensional ◽  
Reference Electrode ◽  
Linear Sweep Voltammetry ◽  
Passive Layer ◽  
Cathodic Reduction ◽  
Linear Sweep ◽  
Current Time ◽  
Lead Monoxide ◽  
Two Peaks

The cathodic reduction of the lead monoxide layer formed on lead in 30% aqueous H2SO4 under anodic oxidation at 0.6 V (vs. Hg/HgSO4 reference electrode) was investigated by linear sweep voltammetry, potential step and admittance measurements. The experimental data were analyzed respectively in terms of thin-layer electrochemistry, electrocrystallisation, and changes of resistance of the PbO layer under reduction. The results seem to be best interpreted from the theory of three-dimensional electrocrystallisation as PbO is reduced to Pb. At sub-zero temperatures the PbO peak observed on our voltammograms and potentiostatic current time transients reveals the splitting of the curves into two peaks, which may be a result of reduction of the same material but of different phases, namely, orthorhombic and tetragonal PbO.

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