Transport in PEMFC Stacks - DOE Hydrogen and Fuel Cells ...
Transport in PEMFC Stacks - DOE Hydrogen and Fuel Cells ...
Transport in PEMFC Stacks - DOE Hydrogen and Fuel Cells ...
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Achievements: New Technique: EODC<br />
Water Reservoir<br />
Micro-flow Meter<br />
H 2<br />
Pressure Controller<br />
Saturator Oven<br />
H 2 O<br />
Membrane<br />
Saturator<br />
H 2 +H 2 O<br />
Insulated<br />
Heat Pipe<br />
Pressure<br />
Transducer<br />
H 2 Pump Oven<br />
RH Meter<br />
???<br />
#H 2 O/H +<br />
H 2 - 2e - → 2H + 2H + + 2e - → H 2<br />
H 2 Pump Cell<br />
Pressure<br />
Transducer<br />
RH Meter<br />
Proportional<br />
Valve<br />
• Water/H 2 <strong>in</strong>let ratio<br />
controlled by<br />
controll<strong>in</strong>g saturator<br />
temperature <strong>and</strong> H 2<br />
pressure<br />
• If ratio is too high, not<br />
enough water is<br />
dragged across <strong>and</strong> cell<br />
floods <strong>and</strong> fails<br />
• If ratio is too low,<br />
membrane dries out<br />
<strong>and</strong> cell fails<br />
• At Water/H 2 =<br />
2*EODC Cell operates<br />
<strong>in</strong> quasi-stable state<br />
Vacuum Pump<br />
Water Trap<br />
All gas/gas diffusion is elim<strong>in</strong>ated<br />
This presentation does not conta<strong>in</strong> any proprietary, confidential,<br />
or otherwise restricted <strong>in</strong>formation<br />
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