segmented cell testing for cathode parameter investigation n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Segmented cell testing for cathode parameter investigation PowerPoint Presentation
Download Presentation
Segmented cell testing for cathode parameter investigation

Loading in 2 Seconds...

play fullscreen
1 / 13

Segmented cell testing for cathode parameter investigation - PowerPoint PPT Presentation


  • 85 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Segmented cell testing for cathode parameter investigation' - jael


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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

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

outline

Validation

  • Parameter investigation
OUTLINE
  • Introduction
  • Experimental
  • Results
  • Conclusion
introduction 1 motivation
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
introduction 2 strategy
INTRODUCTION (2)- strategy -
  • N-folddecrease of testing time
  • Same T, gas concentration, history
results 1
RESULTS (1)
  • Validation
  • Parameter investigation
    • Current density
    • Cathode thickness
    • Cathode composition
    • Cr source

Anode-Supported (AS) cells

Electrolyte-Supported (ES) cells

results 2 validation
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

results 3 current density
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
results 4 cathode thickness
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)

results 5 cathode composition
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)
slide11

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
slide12

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
slide13

THANK YOU

for your attention