1. The problem statement, all variables and given/known data After plotting log(I/A) vs E/mV, you get a tafel curve. calculate the exchange current density, Io, the cathodic transfer coefficient ac and the rate constant of the reaction k. 2. Relevant equations 3. The attempt at a solution Is it simply, the exchange current density is e(y intercept) cathodic transfer coeffiecent, the gradient of the line And then putting those two into the following quation to get K lnI = lnIo + (1-ac) x nF/RT Thanks for your help!