Current, Poor Oxygen Diffusivity in the CCL

What is the effect of finite A, at high currents In this section, the case will be considered for poor oxygen diffusivity and ideal proton conductivity of the CCL. In this case, the local polarization curve of the CCL is given by Equation 4.87. Substituting Equation 5.41 into Equation 4.87, one obtains the local polarization curve with the term describing oxygen transport in the GDL  

Dividing the terms under both logarithms by c (which does not change o) yields 

Assuming, again, that rjo is independent of z (the section Why r]o is Nearly Constant along the Channel ), this can only be possible if the ratio jo/Ch is constant. Repeating the calculations in the section Low-current Polarization Curve leads to the cell polarization curve (Kulikovsky, 2011a) 

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