Transport in PEMFC Stacks - DOE Hydrogen and Fuel Cells ...

Achievements: Design of Gas Diffusion Media: Wet Proofing
MacMullin Number (Dimensionless)
6
5
4
3
2
1
0
Papers with MPL
Ballard Papers
Toray Papers
Modified Ballard Papers
0 10 40 10-
10
10-
40
40-
10
% Wet Proofing Substrate-
MPL
MacMullin number as function
of porosity
Difficult to make general
relationship of N M (ε)
40-
40
MacMullin Number (Dimensionless)
5
4
3
2
1
0
MacMullin number as function of wet
proofing in substrate and MPL
Mitsubishi Rayon
ε -3.8
Toray 40%
Toray 10% PTFE
Bruggeman
Ballard AdvCarb
ε -1.5
-1.5 Showa Denka SCT-
NF2-1
P50 Low
P75 Low
Toray 40-40 P50 High
P75 High
W.L. Gore Carbel,
Carbon Cloth
Carbon Papers Cloth
Paper Carbon Carbon
+MPL Papers Cloth
Ballard Paper Carbon +MPL Baseline Cloth Papers Paper
Ballard Carbon Paper Modified Baseline +MPL
Papers Cloth Papers
Toray 40-10
Toray 10-10
Toray H-120
Ballard EP40T
E-Tek Elat
Toray 10-40
Ballard P75T
Ballard P50T
Toray 0% PTFE
SGL Sigracet 10BB
0.4 0.5 0.6 0.7 0.8 0.9 1
Porosity ε
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