Zur bestimmung des blockierungsgrades an teilweise blockierten festelektroden

Comparative voltammetric and FTIRRAS study on the electro-oxidation of thiourea and methyl-thioureas on platinum in aqueous acid solutions

“…For x > 2000 rpm, data tend to a second linear portion with a slope lower than the previous one and its extrapolation to x ¼ 0 results in approximately the same current value found for peak IIa. The behaviour of these plots indicates that the main reactions related to peaks IIa and IIIa are diffusion controlled, taking place on a partially blocked surface [26]. This conclusion was confirmed by plotting data from peaks IIa and IIIa as I À1 versus x À1=2 .…”

“…This conclusion was confirmed by plotting data from peaks IIa and IIIa as I À1 versus x À1=2 . In this case, for peak IIa a break in the linear plot was observed at high x values, as expected for a blocked surface [26]. Therefore, strongly bound residues are likely produced from adsorption of TUs at potentials below 0.9 V, and are electro-oxidised at potentials above 1.0 V [16].…”

Numerical simulation of partially blocked electrodes under cyclic voltammetry conditions: influence of the block unit geometry on the global electrochemical properties

“…The surface blocking of the electrode modifies the absolute and relative rates of diffusive and kinetic flux to the electrode surface [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. These modifications can lead to errors and inaccurate electrochemical interpretation.…”

Effect of heterogeneity on the dc and ac voltammetry of the [Fe(CN)6]3−/4− solution-phase process at a highly ordered pyrolytic graphite electrode

“…Such electrodes are described as ''partially blocked" and they have been the subject of much research 0022-0728/$ -see front matter Ó 2008 Elsevier B.V. All rights reserved. doi:10.1016/j.jelechem.2007.11.029 [1,[5][6][7][8][9][10][11][12][13][14][16][17][18]. In the more general case, in which electron exchange occurs on both regions, it is possible for quite different reactions to take place on the two types of surface (as with many corrosion scenarios), or the same reaction via different mechanisms.…”

“…Clearly, the unrecognized presence of heterogeneity can lead to erroneous conclusions or faulty data, if the response is analyzed on the false assumption of surface homogeneity. The earliest mentions [3,4] of electrochemical anomalies attributable to electrode heterogeneity appeared in the 1950s, and the topic has been current in the electrochemical literature ever since [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”