PFM in liquid
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How can stray currents be eliminated when doing PFM in liquid? One could produce an insulated cantilever-tip with a small metallic end. Or one can operate at high frequency... but I am not convinced that a field can be sustained in that case.
How do you do it? -
High frequency helps (electrochemistry and diffusion are slow).
Insulated tips is a good solution, but they are not commercially avauilable to my knowldge [there was work in ORNL-UT, Stanford, Harvard, LBL on parallel tracks to make them].
There is also company called Nauga Needles that makes something like this