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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Electrode modeling - diffusion

Posted Feb 19, 2013, 1:39 p.m. EST Microfluidics, Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.2a 2 Replies

Andrea Antonello
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Hi everybody, I am new to COMSOL and I need to model a 2D problem. I have two electrodes (a generator and a collector) immersed in a support electrolyte of 100mM of KCl in which there's a 1mM of Fe(CN6)^(4-) which will become Fe(CN6)^(3-). I need to analyze over time the concentration, taking into consideration the diffusion only (not the convection). Can you help me to set up the problem? I defined the geometry and the control volume, but now I'm stuck in the definition of the problem.
Andrea
2 Replies Last Post Dec 12, 2016, 9:52 a.m. EST
Morgan Anderson
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Posted: 1 decade ago Feb 19, 2013, 5:32 p.m. EST
Hey Andrea,
A little extra information would be very helpful. Are you modelling an SECM experiment, a microfluidic generator collector experiment, or something more like RRDE? Also, do you need time dependent studies (i.e. modelling voltammograms) or are you just interested in modelling in steady state (SECM approach curves, collection efficiencies, etc.). It makes a pretty big difference in how you will set up the boundary conditions.

The Center for Electrochemistry at UT Austin has some walkthroughs that are set up for v3.5, but they are still helpful conceptually.

Another good reference is Electrochemical Methods: Fundamentals and Applications (2ed. 2004) by Bard and Faulkner. Appendix B goes over how to set up boundary layers when writing your own finite element model, but a lot of it still translates into Comsol.

cec.cm.utexas.edu/software/platform/comsol-multiphysics
Hey Andrea, A little extra information would be very helpful. Are you modelling an SECM experiment, a microfluidic generator collector experiment, or something more like RRDE? Also, do you need time dependent studies (i.e. modelling voltammograms) or are you just interested in modelling in steady state (SECM approach curves, collection efficiencies, etc.). It makes a pretty big difference in how you will set up the boundary conditions. The Center for Electrochemistry at UT Austin has some walkthroughs that are set up for v3.5, but they are still helpful conceptually. Another good reference is Electrochemical Methods: Fundamentals and Applications (2ed. 2004) by Bard and Faulkner. Appendix B goes over how to set up boundary layers when writing your own finite element model, but a lot of it still translates into Comsol. http://cec.cm.utexas.edu/software/platform/comsol-multiphysics
睿盛 宋
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Posted: 8 years ago Dec 12, 2016, 9:52 a.m. EST
I have the same question, too

Can u tell me how to settle down the boundary?
I have the same question, too Can u tell me how to settle down the boundary?

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