ABSTRACT
Three kinds of proton-conducting electrolyte powder BaCe0.8Sm0.2O2.9 (BCS) with different microstructures are synthesized by three different methods: EDTA-citrate method, EDTA-citrate and ball-milling method, and hydrothermal method. X-ray diffraction and scanning electron microscopy are used to investigate the microstructure and morphology of the BCS powders, and electrochemical measurements and impedance spectroscopy are employed to analyze electrical characteristics of the electrolyte-supported solid oxide fuel cells (SOFCs). It is found that the performance of electrolyte-supported SOFCs strongly depends upon the electrolyte microstructure, which is dominated by the synthesis methods. At the operating temperature of 650 °C, the highest SOFC performance (80 mW/cm2) is obtained from the cell with nanostructured proton conducting electrolyte powder synthesized by the hydrothermal method, while the lowest performance (17 mW/cm2) is the cell with the largest grain powder synthesized by the EDTA-citrate method without ball-milling treatment.
ACKNOWLEDGMENTS
This work was partially supported by the National Natural Science Foundation of China (51172113), the Shandong Natural Science Foundation (JQ201118, ZR2012EMM006, and ZR2012EML08), the Taishan Overseas Scholar program from the Shandong Province Government, P.R. China, Qingdao Municipal Science and Technology Commission (12-1-4-136-hz and 12-1-4-3-(27)-jch), and the Faculty Research Grant and the Sabbatical Leave Award from Missouri State University.
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