Modeling Voltammetry of a Rotating Disk Electrode
In this work we report a numerical model of a Rotating Disk Electrode (RDE) voltammetry in a finite size domain. Thus, explaining the discrepancy of the diffusion coefficient obtained from the experimental rotating speed, with respect to the literature data. We achieved a very good agreement at the limiting current and at the unexpected peak for the RDE voltammetry at 2000 rpm and different scan rate. We successfully described the concentration profile, proving that the concentration profile at the peak is not completely developed, while in water it matches the concentration profile at the steady state, perfectly. Eventually, we found that the velocity field for the ionic liquid is not well developed for this conditions, in the sense of Cochran, while it is for water.
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