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Diagnostics of Electrode Flooding in PEM Fuel Cells

4/20/2003. 2. HISTORY. Research (Experimental/Modeling) on PEMFCs since 1988.Water/Heat Management Issues [Vanderborg, Hedstrom and Nguyen, 1989]Interdigitated Flow Field Developed, 1989Liquid Water Issues in PEMFCs [Nguyen and White, 1993; Yi and Nguyen, 1998]Modeling Two-Phase Flow in GDL

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Diagnostics of Electrode Flooding in PEM Fuel Cells

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    1. 4/20/2003 1 Diagnostics of Electrode Flooding in PEM Fuel Cells Trung Van Nguyen Department of Chemical & Petroleum Engineering University of Kansas Computational Fuel Cell Dynamics-II Workshop, Banff, Alberta, Canada, April 19-24, 2003

    2. 4/20/2003 2 HISTORY

    3. 4/20/2003 3 MOTIVATION

    4. 4/20/2003 4 Transport Processes in a PEM Fuel Cell with Interdigitated Flow Fields

    5. 4/20/2003 5 Effect of Electrode Flooding on Performance (Cell temperature: 51oC, H2 flow rate: 2 A/cm2, Air flow rate: 2.8 A/cm2, ambient pressure, H2 sparger temperature: 50oC, Air sparger temperature: 27oC)

    6. 4/20/2003 6 Evidence of Mass Transport Limitation in Cathode

    7. 4/20/2003 7 Experimental Setup to Measure Pressure Drop in the Gas Diffusion Layers

    8. 4/20/2003 8 Evidence Of Electrode Flooding As the Cause of Mass Transport Limitation

    9. 4/20/2003 9 Pressure Drop and Current Density Responses As Cell Potential Varied between Open Circuit and 0.5V [Cell temperature: 35oC, H2 flow rate: 1.2 A/cm2, Air flow rate: 1.0 A/cm2, ambient pressure, H2 and Air sparger temperature: 21oC.]

    10. 4/20/2003 10 Effect of Air Flow Rate on Flooding Level in Cathode [Cell temperature: 50oC; Cell voltage: 0.35V; H2 flow rate: 2.0 A/cm2, ambient pressure, H2 sparger temperature: 43oC, Air sparger temperature: 25oC.]

    11. 4/20/2003 11 Effect of Cell Temperature on Flooding Level in Cathode [Cell voltage: 0.45V; Air flow rate: 2.0A/cm2, H2 flow rate: 2.0 A/cm2, ambient pressure, H2 sparger temperature: 43oC, Air sparger temperature: 25oC.]

    12. 4/20/2003 12 Hysteresis Behavior of Liquid Water in Cathode [Cell temperature: 51oC, H2 flow rate: 2.0 A/cm2, Air flow rate: 2.8 A/cm2, ambient pressure, H2 sparger temperature: 50oC, Air sparger temperature: 27oC.]

    13. 4/20/2003 13 Conclusions

    14. 4/20/2003 14 Conclusions (continued)

    15. 4/20/2003 15 Acknowledgements

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