A full description of the microkinetic model, solution procedure, and error analysis is included in the Supplementary Information. In short, reactions [7-9] are cast into a set of rate expressions, where 𝑘 𝑖 * is an electrochemical rate coefficient (dependent on applied voltage), 𝑘 𝑖 is a chemical rate coefficient (independent of applied voltage), 𝜃 𝑁 and 𝜃 𝑃 , are the surface fractions of the polymer in its neutral and electron polaron states, respectively, and 𝐶 𝑎 𝑠 is the concentration of species a at the surface of the electrode: