i -1 vs ω 1/2 Koutecky-Levich plot intercept is 1/ i k and Tafel plot (log(i k ) vs overpotential) generated using the acquired values, yielding a y-axis intercept that equals the log(i o ). The reaction rate constant (k o ) can be calculated using Butler-Volmer analysis (Equation ), where n is the number of electrons, Faradayʼs constant F =96485 C mol -1 , electrode area A = 0.1963 cm 2 , and C is the concentration 1 mM.