Ionic Conducting Composite as Electrolyte for Low Temperature Solid Oxide Fuel Cells
نویسنده
چکیده
........................................................................................................................ I LIST OF PAPERS .............................................................................................................. II TABLE OF CONTENTS ................................................................................................. VII 1 INTRODUCTION .......................................................................................................... 1 1.1 Solid Oxide Fuel Cell ........................................................................................... 1 1.1.1 General Introduction of SOFC ...................................................................... 2 1.1.2 Thermodynamic description of SOFC ........................................................... 4 1.1.3 SOFC components ......................................................................................... 6 1.1.4 Development of low temperature SOFC ....................................................... 7 1.2 Electrolyte of SOFC – Solid ionic conductor ....................................................... 9 1.2.1 Conventional bulk ionic conductors .............................................................. 9 1.2.2 Novel composite ionic conductor ................................................................ 12 1.3 Objectives ........................................................................................................... 15 2 EXPERIMENTAL ....................................................................................................... 16 2.1 Material preparation ............................................................................................ 16 2.1.1 Fabrication of LiAlO2/carbonate composite ................................................ 16 2.1.2 Fabrication of SDC/Na2CO3 nanocomposite ............................................... 16 2.2 Materials Characterization .................................................................................. 16 2.3 Electrochemical characterization ........................................................................ 17 2.3.1 Ionic conductivity of electrolyte .................................................................. 17 2.3.2 Electronic conductivity of electrolyte .......................................................... 20 2.3.3 Discharge performance of SOFC ................................................................ 21 3 RESULTS AND DISCUSSION .................................................................................. 24 3.1 LiAlO2/carbonate composite electrolyte ............................................................. 24 3.1.1 Fuel cell performance of LiAlO2/carbonate composite electrolyte ............. 24 3.1.2 Conduction mechanism discussion .............................................................. 25 3.2 SDC/Na2CO3 nanocomposite electrolyte ........................................................... 26 3.2.1 Characterization of core-shell SDC/Na2CO3 nanocomposite ...................... 26 3.2.2 Fuel cell performance and durability test .................................................... 28 3.2.3 Conduction behavior of composite electrolyte ............................................ 30 3.2.4 Conduction mechanism discussion .............................................................. 31 4 CONCLUSION ............................................................................................................ 34 FUTURE WORK .............................................................................................................. 35 ACKNOWLEDGEMENTS .............................................................................................. 36 REFERENCES ................................................................................................................. 37 APPENDIX I .................................................................................................................... 43 Ionic Conducting Composite as Electrolyte for Low Temperature Solid Oxide Fuel Cells Functional Materials Division, KTH, 2010 1
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