Abstract
It has been observed that metal1-polymer-metal2 cells form electrochemical systems whose open-circuit voltages under vacuum and under atmosphere are significantly different. Having studied the influence of a number of gases, we find that water vapor is responsible for this behavior. We then propose a simple electrochemical model that relates the open-circuit voltage to the water-vapor pressure and the temperature. It is shown that water vapor is simultaneously involved in electrode reactions and in dissociation processes in the polymer. It can also be inferred that the dominant charge carrier is involved in electrode reactions.
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