This app simulates a one-electron electrochemical reaction under galvanostatic control: $$ O + e^- \overset{k_f}{\underset{k_r}{\leftrightarrows}} R $$ I wrote tutorials describing this simulation here. I hope that this tool increases the accessibility of simple electrochemical simulations. Please contact me with any questions, comments, or suggestions!

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$ C_O = $ $ \text{mol/cm}^3 $, initial concentration of $ O $
$ D = $ $ \text{cm}^2 \text{/s} $, diffusion coefficient of both $ O $ and $ R $
$ j = $ $ \text{A/m}^2 $, applied current
$ n = $ , $ e^- $ per reaction
$ \alpha = $ , charge transfer coefficient
$ k_0 = $ $ \text{cm/s} $, electrochemical rate constant
$ L = $ , simulation resolution

Legend:

Simulation timescale, $ \tau = $ $ \text{h} $