I have fabricated thin films and want to measure the impedance parallel to the material. I suspect the films are conducting protons and electrons based on some Hall effect measurements I have taken. I am a little confused in terms of the electrodes used for these measurements and what one might expect in terms of a Nyquist plot. I am using Pt wire as the WE and CE for one measurement and the clamps that came with our potentiostat (which I assume are stainless steel).

In the case of Pt electrodes; proton conductivity should be measured as long as there is sufficient water and and electrons will also move through the material. Therefore, it isn't blocking to anything, correct? I also do not see any Warburg impedance at this point which makes me wonder if protons are in fact mobile charges in this material. When I use the clamps then I should be blocking electrons and measuring the protons, right? If I just wanted to measure electrons and not ions what electrode material should I use (graphite?) or should I try to make the relative humidity 0% and have dry films?

Any advice on this matter would be appreciative. I apologize if this is confusing. Thank you!

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