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- W263890819 abstract "The main focus of the work is to develop solid oxide fuel cell electrolytes that operate in the 600-800 C range. The first phase of the work focused on the development of composite Bi2O3-ZrO2 electrolytes which showed the promise of high conductivity and stability towards fuel. Kinetic stabilization of Bi2O3 compositions which resist phase transformation was also demonstrated. Work on two layer composite electrolytes with a thin ZrO2 protective layer was continued. Initial sputter coating trials on CeO2 electrolytes exhibited thin cracks in the ZrO2 layer due to mismatch in thermal expansion coefficients. Development of an EVD process for coating of a thin layer appears to be a viable technique. Single cell tests using uncoated CeO2 electrolytes using tubular cells showed a performance of about 100mA/sq cm at 0.4 V at approximately 800 C while the performance of planar cells is about 250mA/sq cm at 0.4 V. The main challenge is to fabricate composite electrolytes without causing either delamination or microcracking. Vacuum sputter deposition was chosen as the first process and alternate techniques such as EVD and plasma spraying are also being considered. The transport properties are then evaluated and electrodes are optimized for testing and evaluation as SOFCs." @default.
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- W263890819 date "1992-02-01" @default.
- W263890819 modified "2023-09-27" @default.
- W263890819 title "Development and optimization of planar-geometry solid-oxide fuel cells. Annual report, December 1990-December 1991" @default.
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