The default properties are based on [DuPont2004N],
except that the default value of protonic conductivity (σ =
0.083*U.S/U.cm) is for the DuPontTM Nafion®
N and NE series [DuPont2004N].
It is not listed for DuPontTM Nafion® NRE-211 in
[DuPont2004NRE].
For more information, please see the PEM model.