Figure 2. In the electric field there is an electric conductor. The electrons (-) within the conductor move according to their negative charge towards the positively charged electrode. To balance the charge, ions diffuse to the oppositely charged poles.

From

Tracking Electrons - Colourful Insights into the Processes of Bipolar Electrochemistry with Polypyrrole

Dominik Quarthal, Marco Oetken

World Journal of Chemical Education. 2023, 11(3), 114-120 doi:10.12691/wjce-11-3-15