Glassy carbon electrodes scan rate effects

Figure 8.12. Linear sweep voltammograms detailing the effect of US assistance for 2 min on electrode depassivation for the oxidation of dopamine in the range 20-100 pM at a glassy carbon electrode within egg homogenate. pH 7, scan rate 50 mV/s. (Reproduced with permission of Elsevier, Ref [142].)...

Table 2. Effect of scan rate on the peak current for the oxidation of SCN at the glassy carbon electrode modified with Ru-containing him.

Cyclic voltammetry at different applied potential scan rates is normally the first technique employed to study the properties of polymer-modified electrodes. From current-potential curves recorded with solutions containing supporting electrolyte only and at scan rates sufficiently low for thin layer conditions to prevail both the formal potentials and the amounts of redox species incorporated in the surface coating can easily be measured. In addition, deviations from ideal behaviour provide information on interactions within the polymer phase and, when uncompensated resistance effects can be accounted for, on the reversibility of electron transfer at the electrode-coating interface. Figure 4 shows a typical cyclic voltammogram obtained from a glassy-carbon electrode covered with... 

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