I am not able to measure zero current potential (Em), electrolyte was potassium fluoride (KF) (10 concentration gradient) of few micron hole device with Ag/AgCl electrodes (which prepared by dipping to bleach technique). I calculated zero current potential by active coefficient values for KF which was not matching with measured one. Later I measured KCl with all above same parameters I got expected Em value (measured from active coefficient).
Then what was the reason ? (I am suspecting electrodes) can you suggest suitable electrodes (two electrode system) for potassium fluoride, is electrode selective will come in to picture?
best regards
Goutham
Dear Solleti,
I think you can use the four electrode method to avoid the voltage drop on the electrode junction. You can use two platinum electrodes for example to push current in the electrolyte then use two reference electrodes to sense the voltage at two points in the electrolyte in the current path. By this way you can get the I-V characteristics of the electrolyte without affecting it by the electrode potential drop.
Best wishes
Dear Zekry
Thank you for the valuable information, Ill let you know if it works.
Cheers
Goutham
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