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Diffusion of a redox active molecule
Posted Jul 6, 2020, 4:59 a.m. EDT 1 Reply
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Hello, I am trying to model the diffusion of a redox active molecule. I tried to use the Electroanalysis physics but I am not sure how to choose my geometry and reaction. I tried choosing a quartre circle (radius 0.01m) geometry and a point located on one of the circles boundries (r direction) at 0.0015m (the electrode radius). I want to take in account that there's a redox reaction on the eletrode and to see the diffusion of the oxidized species. I chose as initial values 0 for the oxidized species, but not sure what to do about the reduced species. I want to limit it to be only in the electrode area and not in the entire domain...I used a concentraion boundry and tried different options for cRed and cOx (redcued and oxidized species), but I am getting negative concentrations in the solution: option 1: cRed = 0.2e-6 - cOx cOx = 0
option 2: cRed - 0,2e-6 cOx = 0
How do i avoid these negative concentrations?
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Hello Maya, Have you checked this knowledge base entry already? https://www.comsol.com/support/knowledgebase/952