This equation provides direct physical insight into the factors influencing each degradation mechanism, and indicates that the contribution of each degradation mechanism is separable. The contribution of different mechanisms is related to kinetically dependent material parameters. Specifically, the film resistance mechanism correlates with the differential conductance, denoted as ∂ ī ∂η , which characterizes the rate of current acceleration in response to an increase in potential. The electrolyte concentration mechanism is primarily related to the reduction current fraction in the total current, īred / ī. This arises because electrolyte concentration only participates as a reactant in the reduction reaction. Each parameter gives insight into how degradation manifests in the kinetics.