Why do we use the potassium ferri/ ferrocyanide system as redox probe for EIS characterization of chemically modified electrodes (CME)?

Is it possible to use just one of them?

Is it possible that during the EIS experiment, some of the ferricyanide ions get adsorbed into the CME and form some metal hexacyanoferrate (if the CME contains some metal nanoparticles e.g. Cu or Pd)?

If we are studying the oxidation/ reduction of some analyte over a CME, is it possible to use that analyte in place of the ferri/ ferro couple to calculate some kinetic parameters?

I will be thankful for detailed answers and relevant references.

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