Chronoamperometry Measuring Current due to Electrode-Electrolyte Diffusion at Electrode Surface
Posted 2 Aug 2020, 21:30 GMT-4 Batteries & Fuel Cells, Application Builder, Parameters, Variables, & Functions Version 5.2a 3 Replies
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I am currently trying to perform a Cottrell Experiment by simulating electrolyte diffusing into our working electrode of interest which in this specific case is a 3D thin film. I used COMSOL's "1D Thin Layer Chronoamperometry" from the Electrochemistry Module Application Libary Module as a basis when constructing my 3D simulation. The goal is to build a model that generates current which matches up with the current calculated from the Cottrell Equation.
However, my results show that the Cottrell Equation predicts higher currents than what is being measured at short times and the resulting concentration profile definitely does not match was is expected in this type of experiment.
My principle investigator predicts the deviation could be a result of how I set up one of my boundary conditions. However, still learning how the Electronanalysis interface works is making it difficult to figure out if I set up anything incorrectly or if I am missing anything entirely from my simulation settings. I am using an Academic Class Kit License Version 5.2a.
I have attached screenshots below if they help clarify as the COMSOL file itself was too large to attach.
Any pointers or assistance would be grealty appreciated! Thank you very much for your time.
Joe Gonzales ; University of California, Irvine