I am performing cyclic voltammetry in 1 mM K2IrCl6 / 0.1 M KCl to study the kinetics of carbon electrodes. For slow scan rates of 5 and 20 mV/s, I have an interpeak distance below 59 mV (at 5 mV/s, interpeak distance = 38 mV).
The redox couple is IrCl62-/IrCl63-, so a one-electron reaction.
Any ideas on what could be happening?
it is one electron transfer
at 5 mv/sec-- it is coupled chemical reaction involving adsorbed intermediates
I don't know I am getting your question or not...but from the interpeak difference( Epa – Epc) which is less then 59mv we can assume that it is showing a reversible redox couple at low scan rate..it can be further proved by the ratio of cathodic-to-anodic current (ipc/ipa) which should be ~1. Again if you plot ip vs (scan rate)½ at different scan rates you can be sure that the redox response is whether it is a diffusion controlled process etc. But the no of electrons involved, you cannot simply say that it is 1 or 2 electrons redox process..there is an equation Randles..by which you can calculate no.s of electrons..
hope it will help.
Thanks all for your answers! I'm indeed working with a porous electrode, this seems like the most plausible explanation.
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