KJ Ceramics 31

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Detailed Program

Paper Number : FU-P04

Time Frame : 12:00~13:30

Presentation Date : Thursday, 27, November

Session Name : Fuel cells and Batteries

Session Chair 1# : -

Session Chair 2# : -

Degradation Study of Yttria Doped Barium Cerate (BCY) Electrolyte in Protonic Ceramic Fuel Cells

Ms. Miyoung Park

Changwon National University

Acceptor-doped barium cerate has been considered as a potential electrolyte material in solid oxide fuel cell because of its high proton conductivity at temperatures below 7000C. However, despite its superior transport property, barium cerate cannot be practically used in fuel cell due to its poor chemical stability in the atmosphere of water vapor and carbon dioxide. In the present study, we fabricated yttria doped barium cerate (BCY) electrolyte, Ni + BCY anode supported cells, and their electrochemical degradation and stability were investigated as a function of electrolyte thickness (15 vs. 30 microns), electrolyte structure (BCY single layer vs. BZY/BCY bi-layer) and cathode components (LSCF + BCY vs. LSCF + BZY). Constant current (CC) tests were conducted on the cells under various operating conditions such as positive vs. negative cell voltage and high vs. low fuel/air flow rate. Before and after the CC tests, I-V curve and impedance spectra were measured and compared to trace any increase in ohmic and/or non-ohmic resistance of the cells. Post-material analyses were conducted using SEM and XRD after the tests. The results indicate that electrolyte thickness and air flow rate can significantly influence the cell degradation rate, especially at a negative cell voltage. It was also found that the employment of LSCF + BZY cathode and BZY/BCY bi-layer is effective to improve the cell stability.

Acknowledgements :

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