On the meaning of the diffusion layer thickness for slow electrode reactions

2013 ◽  
Vol 15 (7) ◽  
pp. 2381 ◽  
Author(s):  
A. Molina ◽  
J. González ◽  
E. Laborda ◽  
R. G. Compton
Keyword(s):  
Layer Thickness ◽  
Diffusion Layer ◽  
Diffusion Layer Thickness ◽  
Electrode Reactions

scholarly journals Theoretical description of the ligand function for ionoselective electrodes reversible to metal anion complexes. 1. Lower detection limit and its determining factors

2020 ◽  
pp. 17-28
Author(s):  
Vladimir V. Egorov ◽  
Andrei V. Semenov ◽  
Andrei D. Novakovskii ◽  
Yauhen B. Akayeu
Keyword(s):  
Detection Limit ◽  
Layer Thickness ◽  
Diffusion Layer ◽  
Theoretical Description ◽  
Diffusion Layer Thickness ◽  
Thiocyanate Ion ◽  
Lower Detection Limit ◽  
Diffusion Parameters ◽  
Lower Detection ◽  
And Diffusion

Within the framework of the steady-state diffusion model, the theoretical description for the thiocyanate ion lower detection limit (LDL) by the tetrathiocyanatozincate selective electrode, has been presented. The main assumptions of this model are constancy of the ion exchanger concentration along the membrane, traditionally used in various phaseboundary potential diffusion models, and linear profiles of components’ concentrations in diffusion layers. Simple quantitative expressions have been obtained, connecting thiocyanate ion concentration in the solution surface layer (responsible for LDL value) with phase boundary extraction equilibria constants, stability constants for zinc thiocyanate complexes, and diffusion parameters in the membrane and solution phases. Calculated LDL values are in good agreement with experimental data provided in the literature. It has been shown that LDL can be reduced substantially by controlling such easily regulated diffusion parameters as diffusion layer thickness in the membrane phase, which is a function of time, and diffusion layer thickness of the sample solution, which is governed by stirring regime.

Organic Sonoelectrochemistry on Mercury Pool Electrode

2000 ◽  
Vol 65 (6) ◽  
pp. 941-953 ◽  
Author(s):  
Jiří Klíma ◽  
Jiří Ludvík
Keyword(s):  
Mass Transfer ◽  
Layer Thickness ◽  
Diffusion Layer ◽  
Current Density ◽  
Electrode Surface ◽  
Diffusion Layer Thickness ◽  
Local Mass Transfer ◽  
Electrolytic Current ◽  
Mercury Electrodes ◽  
Instantaneous Increase

So far, the influence of sonication on the electrolytic current was studied only at solid or rather miniaturized mercury electrodes. The presented paper reports on sonoelectrochemical experiments at a liquid mercury pool electrode. Two sonoelectrochemical cells have been developed and tested. It was shown that during sonication, the electrolytic current increases in a number of individual peaks representing short local enhancements of current density due to vigorous local mass transfer and instantaneous increase of fresh electrode surface. Both these effects are caused by microjets of solution formed during violent unsymmetric collapses of cavitation bubbles in the close vicinity of the electrode surface. The newly formed electrode surface and the decrease in the diffusion layer thickness were estimated and discussed. An example is presented where the sonication is used for destruction of a film of products formed during electrolysis of cysteine, that otherwise rapidly inhibits continuation of the electrode process.

scholarly journals Electrochemical DNA biosensors based on long-range electron transfer: investigating the efficiency of a fluidic channel microelectrode compared to an ultramicroelectrode in a two-electrode setup

Lab on a Chip ◽  
2016 ◽  
Vol 16 (22) ◽  
pp. 4373-4381 ◽  
Author(s):  
M.-C. Horny ◽  
M. Lazerges ◽  
J.-M. Siaugue ◽  
A. Pallandre ◽  
D. Rose ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Layer Thickness ◽  
Forced Convection ◽  
Long Range ◽  
Diffusion Layer ◽  
Dna Biosensors ◽  
Fluidic Channel ◽  
Diffusion Layer Thickness ◽  
Dna Collection

Forced convection decreases the diffusion layer thickness on microelectrode and promotes a faster DNA collection.

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