Simulation of the charge and potential distribution in the double layer formed by polymer electrolyte

We present Monte Carlo simulations of phase separation on the nm scale in the double layer formed by wetted NAFION or NAFION-type polymer electrolyte near the charged metal surface. The results obtained indicate that the phase separation may cause appreciable spatial fluctuations of the potential near the surface. If e.g. the drop of the potential in the double layer is about 1 V, the amplitude of the fluctuations of the potential may be 0.2–0.3 V. Such fluctuations may influence the rate of electrochemical reactions.