Diffusion coefficient for ACFc at 25 o C is 2.43E -5 cm 2 /s. Similarly Using Koutecky-Levich Equation 1 we can calculate heterogeneous electron transfer rate constant (k o ) for AcFc and Fe(acac) 3 at both temperatures. In the case of D value calculation, we have taken plateau limiting current and here we have taken not plateau current. Here, i k is the kineticcontrolled current any mass-transfer effects are absent and is dependent on the reaction kinetics.