When calculating the cell potential of an electrolysis cell, does a proton exchange membrane (PEM - such as a Sustainion membrane) influence the overall cell potential, and if so, how do you calculate it?
See diagram below for example of PEM Electrolysis Cell.
Md. Kabir Ahamed
The calculation for the charge of an ion across a membrane, The Nernst Potential, is relatively easy to calculate. The equation is as follows: (RT/zF) log([X]out/[X]in). RT/F is approximately 61, therefore the equation can be written as
(61/z) ln([X]out/[X]in)...................(i)
- R is the universal gas constant (8.314 J.K-1.mol-1).
- T is the temperature in Kelvin (°K = °C + 273.15).
- z is the ionic charge for an ion. For example, z is +1 for K+, -1 for Cl-, etc. Remember, z does not have a unit.
- F is the Faraday's constant (96485 C.mol-1).
- [X]out is the concentration of the ion outside of the species.
- [X]in is the concentration of the ion inside of the species.
But for PEM Electrolysis Cell, this article will help you to calculate that: Article Modelling and Experimental Analysis of a Polymer Electrolyte...
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