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Towards a Sustainable Energy Future 2022 Spring Fuel Cell and Electrochemistry Lecture 9 Kiics of electrode reactions Towards a Sustainable Energy Future Dynamic Equilibrium Towards a Sustainable Energy Future Dynamic Equilibrium ? The kiic theory therefore predicts a constant concentration ratio at equilibrium, just as thermodynamics does。 ? Kiics describe the evolution of mass flow throughout the system, including both the approach to equilibrium and the dynamic maintenance of that state. ? Thermodynamics describe only equilibrium. ? Exchange velocity: equilibrium features nonzero rates of conversion of A to В (and vice versa), but those rates are equal. v0 Towards a Sustainable Energy Future The Arrhenius Equation and Potential Energy Surfaces A is the preexponential factor k is the reaction rate coefficient EA activation energy Towards a Sustainable Energy Future Towards a Sustainable Energy Future Transition State Theory ? we focus on the special condition in which the entire system—A, B, and all other configurations—is at thermal equilibrium Towards a Sustainable Energy Future Essentials of electrode reactions ? we always saw that current is often limited wholly or