1 / 17

Cahit Benel, Azad J. Darbandi, Horst Hahn

Nanostructured thin film s of La 0.6 Sr 0.4 CoO 3-δ via spray pyrolysis for micro-SOFC application. Cahit Benel, Azad J. Darbandi, Horst Hahn. Michel Prestat, Ren é Tölke, Anna Evans. Fundamentals of SOFC. Cathode : ½ O 2 + 2 e -  O 2-. Anode : H 2 + O 2-  H 2 O + 2 e -.

juliet
Télécharger la présentation

Cahit Benel, Azad J. Darbandi, Horst Hahn

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nanostructured thin films ofLa0.6Sr 0.4CoO3-δ via spray pyrolysis for micro-SOFC application Cahit Benel, Azad J. Darbandi, Horst Hahn Michel Prestat, René Tölke, Anna Evans

  2. Fundamentals of SOFC Cathode: ½ O2 + 2 e-O2- Anode: H2 + O2- H2O + 2 e- Total:H2 + ½ O2 H2O 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  3. MotivationLosses in SOFC • To reduce the losses: • Making the whole cell as thin as possible • Optimizing of electrode materials and their properties National Energy Technology Laboratory Fuel cell handbook. 7th ed. Morgantown, WV: U.S. Department of Energy; 2004. 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  4. Micro-solid oxide fuel cell - State of artCollaboration with ETH Zurich µPEMFC 80 °C pure H2 Electrolyte Cathode µSOFC 350-550 °C hydrocarbons Evans, A. et. Al. Journal of Power Sources194 (2009) 119-129 Si µDMFC Li-ion batteries Anode Goal: Nanoparticulate thin film cathode with thickness between 200 nm and 500 nm Ni-MH batteries 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  5. Synthesis of LSCSalt-assisted Spray Pyrolysis Control Vacuum Furnace Filter p valve pump MFC T O 2 Ultrasonic nebulizer Carrier Gas Water based precursor La0.6Sr0.4CoO3-δ(LSC) 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  6. ResultsSalt-assisted Spray Pyrolysis As synthesized No reaction between NaCl and LSC phase 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  7. Removal of Salt After washing As synthesized As synthesized nanopowder washed by DI water to remove NaCl. 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  8. XRD Before washing After washing Crystallite size ≈ 7 nm 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  9. Electrochemical Characterization LSC • Yttria stabilized zirconia (YSZ) substrates • Ce0.8Gd0.2O1.9 (GDC) buffer layer via spin coating (950 °C for 2 h) • LSC functional layers via spin coating • (550 °C for 1 h) • LSC • LSC-GDC (10-40 wt %) nanocomposite GDC YSZ GDC LSC • Symmetrical cells under OCV • 1MHz-0.1Hz • 450-650 °C with 50 °C increments • PO2=0.01-1 atm 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  10. Electrochemical Characterization 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  11. Electrochemical CharacterizationDependence of ASR on temperture & GDC concentration * Karageorgakis et. al., Journal of Power Sources 195 (2010) 8152-8161 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  12. Summary • Nanocrystalline single phaseLSC via SASP • Nanoparticulate thin films of LSC and LSC-GDC (10-40%) with thicknesses between 200 and 500 nm by single step spin coating • LSC-GDC (30%) nanocomposite films showed the lowest ASR values • 0.78 Ω cm2 (250 nm thickness, @ 600 °C) Next step To check the performance of the LSC functional thin films on free standing electrolytes 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  13. Acknowledgments Financial support: Center for Functional Nanostructures (CFN) Equipment support: Elektrochemie Verbund-Süd 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  14. Thank you for yourattention 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  15. 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  16. 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

  17. Free standing electrolyte - State of artCollaboration with ETH Zurich 1. Silicon nitrade deposition 2. Photoresist by spin coating 3. Exposure & Development 4. Plasma etching of silicon nitride 5. Deposition of electrolyte (PLD) 6. KOH wet etching of Si 7. Plasma etching of silicon nitride 26.03.2012 | Gemeinschaftslabors Nanomaterialien | Cahit Benel

More Related