Processing and Characterization of Electrolyte Thin Filmfor Anode-Supported Solid Oxide Fuel Cell
Date Issued
2010
Date
2010
Author(s)
Chen, Yen-Yu
Abstract
Various thin yttria-stabilized zirconia (YSZ) and ceria (YDC) electrolytic films on anode-supported solid oxide fuel cell (SOFC) have been prepared to improve the performance of the made cells by either a sol-state deposition or colloidal deposition (CD) process. 4-8 mol% yttria-doped zirconia layer was prepared to reach the requirements of crack-free, dense and thin coats. The best half cell consisted of 4YSZ film with 0.5 um thickness showed a higher power density (477 mW/cm2) at 600oC than the cell with microns 8YSZ electrolyte layer. The CD method is also able to prepare crack-free and dense YSZ films in thickness of 2.5~8 um on porous anode substrate via one coating cycle.
YDC as the second electrolytic layer is prepared by colloidal deposition to prevent the reaction of YSZ/(La,Sr)MnOx (LSM). The solid solution reaction between YSZ and YDC has been analyzed. XRD and high resolution TEM results show that the reaction of YSZ and YDC layers starts at 1200oC, and becomes fully solid solution at 1600oC. The diffusion of Ce ions into YSZ grains is faster than the reversed migration of Zr ions into YDC at 1300oC.
Electrochemical analysis on assembled cells has been conducted. By measuring the open circuit voltage (OCV), area specific resistance (ASR), and current-voltage-power (I-V-P), the power density of made gas-tight cells can be improved step-by-step in consideration of the interface contact between current collector/cathodes, oxidation of Ni-foam at cathode in oxidation condition, the replacement of LSM by LSCF cathode material, and new arrangement of layer configuration.
Subjects
electrolyte
YSZ
SOFC
Power density
solid solution
Type
thesis
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