- #1
MatthiasS
- 2
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Hi there,
I am currently studying charge transfer reactions between metallic electrodes and redox couples in aqueous electrolytes (in a diffusion limited system), and I was wondering about the influence of the rate constant on the reduction/oxidation peak maximum. Typically, it is assumed that a decreasing rate constant results in a greater reduction/oxidation peak separation and also in a reduction of the peak current values (see attached picture). I get why the peak separation increases for slower rate constants, but I do not understand what causes the decrease of the peak maximum (since the diffusion of the electroactive species in the electrolyte should limit the maximum current value). Does anybody have an idea what causes the decreasing peak currents?
Thanks a lot for your help!
Cheers,
Matthias
I am currently studying charge transfer reactions between metallic electrodes and redox couples in aqueous electrolytes (in a diffusion limited system), and I was wondering about the influence of the rate constant on the reduction/oxidation peak maximum. Typically, it is assumed that a decreasing rate constant results in a greater reduction/oxidation peak separation and also in a reduction of the peak current values (see attached picture). I get why the peak separation increases for slower rate constants, but I do not understand what causes the decrease of the peak maximum (since the diffusion of the electroactive species in the electrolyte should limit the maximum current value). Does anybody have an idea what causes the decreasing peak currents?
Thanks a lot for your help!
Cheers,
Matthias