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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 -.

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Cahit Benel, Azad J. Darbandi, Horst Hahn

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  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

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  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

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