where species A and B are in solution, and E 0 , k 0 , and α are the reversible formal potential, standard heterogeneous charge transfer rate constant at E 0 and the charge transfer coefficient, respectively. We assume that the Butler-Volmer formalism applies to the electron transfer process. We also assume that both convection and migration can be neglected since we are using a macrodisk stationary electrode and an excess of supporting electrolyte, respectively. Since we assume equal diffusion coefficients for each species A and