Question 3. The following cathodic peak currents were recorded in a cyclic voltammetric experiment at a constant potential sweep rate of 20 mV s-1 [O]/mM 1 2 3 4 5 8.5 16.9 25.3 33.8 51.0 i/mA Graphically estimate the diffusion coefficient. The diameter of the circular electrode was 1 mm, and n = 1. Randles-Sevcik equation ip = 2.69 x 105 n3/2 A [O] D1/2 v1/2