Water Content in Nafion-PEM

The water absorbing capacity of Nafion-117 is given by Equation 9.13 as 

The humidity condition at the gas diffusion catalyst layer interface is given as the water activity or relative humidity (a) and defined as 

For dominant mass concentration loss in the cathode electrode, the limiting current density is given by Equation 11.24b 

Consider the electrolyte as 8% YSZ solid oxide fuel cell with the following known data  

Cathode exchange transfer coefficient, a = 0.5 Cathode exchange current density, = 0.1 A/cnC Layer thicknesses  

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