Hello,
Disclaimer: I am new to COMSOL, this is the first thing I am trying to model with the software.
I am trying to model an electrode assembly to see what would happen when I place an ion-exchange membrane (lets say a cation-exchange membrane like Nafion), close to an electrode surface, and then apply a voltage, without any electrochemical reactions taking place. Only trying to charge the surface. See the attached picture, which should hopefully be self explanatory.
Physically, what I am imagining should happen is that cations should be pulled through from the potential field, and move to the surface, causing a low concentration at the Nafion membrane, and continue to do this until the cationic charge balancing the electrode potential, and the rest of the volume fills up to balance the bulk concentraion of cation. But maybe I am completely wrong... so I want to model it!
Attached is my attempt so far, but it doesnt work, or make any sense, so hoping I can get some help!