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Segmented cell testing for cathode parameter investigation

ENI Fuel Cells. Segmented cell testing for cathode parameter investigation. Industrial Energy Systems Laboratory (LENI), Group of Electrochemical Engineering (GGEC), Interdisciplinary Centre of Electron Microscopy (CIME) École Polytechnique Fédérale de Lausanne – EPFL Lausanne - Switzerland.

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Segmented cell testing for cathode parameter investigation

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  1. ENI Fuel Cells Segmented cell testing for cathode parameter investigation Industrial Energy Systems Laboratory (LENI), Group of Electrochemical Engineering (GGEC), Interdisciplinary Centre of Electron Microscopy (CIME) École Polytechnique Fédérale de Lausanne – EPFL Lausanne - Switzerland P. Tanasini, J. A. Schuler, Z. Wuillemin, M. L. Ben Ameur, C. Comninellis, and J. Van herle European Fuel Cell Forum Lucerne, July 2nd 2010

  2. Validation • Parameter investigation OUTLINE • Introduction • Experimental • Results • Conclusion

  3. INTRODUCTION (1)- motivation - Buttoncelltesting: • Lowdegradation Long testing time 0.6 A/cm2, 850°C, 7%H2O/H2 • Fluctuations And more… … for eachexperiment!! • Objectives: • Reduce testing time • Increase reproducibility

  4. INTRODUCTION (2)- strategy - • N-folddecrease of testing time • Same T, gas concentration, history

  5. EXPERIMENTAL- the testing station - I I

  6. RESULTS (1) • Validation • Parameter investigation • Current density • Cathode thickness • Cathode composition • Cr source Anode-Supported (AS) cells Electrolyte-Supported (ES) cells

  7. RESULTS (2)validation 4 IDENTICAL CELLS • IV-CURVES • Similar behavior • Small difference in OCV • Polarization lowers the difference 850°C, 97%H2/3% H2O • EIS MEASUREMENTS • High frequency overlapping • Low frequency mismatch (conversion process) • H2O/H2 distribution ~3 hz 850°C, 97%H2/3% H2O

  8. RESULTS (3)current density 0.30 A/cm2 0.30 A/cm2 0.45 A/cm2 • Activation at 0.3 A/cm2 • Operation at different I 0.60 A/cm2 0.75 A/cm2 850°C, 97%H2/3%H2O • Polarization-driven activation • Current-dependent degradation

  9. RESULTS (4)cathode thickness 850°C, 93%H2/7% H2O, 0.6A/cm2 20µm 10µm 15µm • Different thicknesses • Operation 0.6 A/cm2 5µm • Difference in Rohm at the beginning • AS-B I limited by thickness • Different degradation behavior: Cr contamination (SEM, WDX)

  10. RESULTS (5)cathode composition • LSM/Mn-doped YSZ cathodes • Same microstructure (except AS-C II) 850°C, 93% H2/7% H2O • EIS analysis with variation of: • Temperature (750°C, 800°C, 850°C) • Current density (OCV, 0.3 A/cm2, 0.6 A/cm2) • Fuel composition (93%H2/7%H2O, 65%H2/7%H2O, 65%H2/5%H2O)

  11. RESULTS (6)Cr source • WE (cathodes) exposed to Cr source • One polarized cell, 3-electrode measurements • One cell at OCV, symmetric cell measurements (4-electrode configuration) 800°C, 0.2 A/cm2, air both sides • Separation of the cathodic contribution in the polarized cell • The non-polarized cell doesn’t show degradation

  12. CONCLUSIONS • The multicathode strategy permits to decrease n-fold the testing time • Same testing environment, history for all the segments • Rapid identification of issues by comparison • Flexibility comparable to the classic button-cell testing

  13. THANK YOU for your attention

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