A comparison of the Levich (I vs  -1/2 ) analysis (Figure -III) of the catalyst and the RAE 7 showed that diffusion of NiCl2(bpy) was not significantly impacted by the silver nanoparticle layer (the calculated diffusion coefficient decreased by a factor of 2). However, 7 showed a significant change in its diffusion behavior on the silver nanoparticle functionalized RDE. While at slow rates of rotation the currents at the bare and Ag modified electrodes are comparable, at faster rates of rotations there is a clear divergence. Moreover, upon extrapolation to zero rotation, the intercept is clearly non-zero, suggesting possible adsorptive effects. Taken collectively with the results of reaction progress over time (See SI, Figure -20), these results suggest that a decreased amount of direct reduction of RAE at the cathode is likely responsible, at least in part, for the improved reaction yield.