Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Electroanalysis - impedance

Please login with a confirmed email address before reporting spam

Dear all

I have tried to browse through documentation and exemplary models to find out what "Electroanalytical Butler-Volmer" kinetics means in terms of concentration polarization. There is no ambiguity if the electrode is in equilibrium potential, but if the bias potential of the electrode is not zero, the steady-state surface concentrations naturally are different from the equilibrium ones. I suppose I have to use "Concentration dependent kinetics". I tried that, but the results were nonsense; apparently that was not the correct way of doing it.

Hence, my question is: Does the "Electroanalytical Butler-Volmer" kinetics take implicitly into account the concentration polarization due to the dc bias potential of the electrode? If not, do I have to include a transport node in my model in order to solve the surface concentrations first? This question is relevant to cyclic voltammetry simulation as well.

Lasse

0 Replies Last Post Jan 15, 2014, 3:45 a.m. EST
COMSOL Moderator

Hello Lasse Murtomäki

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.