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

Achievements: Design of Gas Diffusion Media
Comparison of Mercury pore size distributions of new design GDLs
Cumulative Intrusion Volume (mL/g)
Incremental Intrusion Volume (mL/g)
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0.001 0.01 0.1 1 10 100 1000
Pore Size Diameter (µm)
1.4
1.2
1
0.8
0.6
0.4
0.2
Baseline Substrates
EP40T
P50T
P75T
EP40T
P50T
P75T
0
0.001 0.01 0.1 1 10 100 1000
Pore Size Diameter (µm)
Cumulative Intrusion Volume (mL/g)
Incremental Intrusion Volume (mL/g)
2.5
2
1.5
Cumulative pore volume
1
0.5
0
0.001 0.01 0.1 1 10 100 1000
Pore Size Diameter (µm)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
P50T_baseline
P50_Low
P50_High
Differential pore volume
Modified Substrates
P50T_baseline
P50_Low
P50_High
0
0.001 0.01 0.1 1 10 100 1000
Pore Size Diameter (µm)
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or otherwise restricted information
EP40T has largest
pore volume,
concentrated at 50
µm
Modification greatly
reduces volume of
large pores
14