How can I create spatial separation/concentration of ions in an electrolyte solution (KCl) without direct electrode-liquid contact?
The (unsuccessful) experiment so far:
Superimposing an electric field on the electrolyte chamber with the setup: conductor 1 (up to 1000V) - insulator (0.5mm) - electrolyte (1mm, 1mM KCl) - insulator (1mm) - conductor 2 (0V).
The measurement method: measurement of impedance with two flat electrodes at the bottom of the electrolyte chamber.
Expectation: there will be a higher ion concentration in the area of the impedance measurement and the impedance will decrease.
Result: Absolutely nothing happens.
A consideration that may explain the problem: Why do electrodialysis stacks use electrodes with direct electrolyte contact and accept electrode gas production instead of superimposing an electric field on the stack without conductive contact to the electrolyte?