Processing of high conductive Bi2O3/8YSZ composites as SOFC electrolyte
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Dual-phasic composites consisted of continuous Bi2O3 matrix and 8 mol% yttria stabilized zirconia particulates were prepared by solid-state-sintering or liquid-phase-sintering, and investigated over the temperature range between 250-650 oC to reveal good electrical conductivity and matched thermal expansion to the components used for intermediate-temperature solid oxide fuel cell (SOFC). Interface reactions occurred during sintering either at 750 oC or 900 oC could enhance the diffusion of Zr, Y and Bi ions, to form effective diffusion zone for stabilizing δ-Bi2O3 matrix. The results showed a dual-structure of 66 mol% 8YSZ-34 m% Bi2O3 with up to 76% δ-phase content was stabilized by solid-state sintering, surpassing a bulk conductivity of 10−2 Scm−1 at 500 oC. The coefficient of thermal expansion value exhibited by the composite between 25 oC and 650 oC was found to be 10-12.2 ppm*K−1, which was in good agreement with that of CeO2-based electrolyte. Thus, it was confirmed that the addition of ZrO2 could stabilize the Bi2O3, by improving its capability as a solid electrolyte for intermediate temperature SOFC
Abstract
Dual-phasic composites consisted of continuous Bi2O3 matrix and 8 mol% yttria stabilized zirconia particulates were prepared by solid-state-sintering or liquid-phase-sintering, and investigated over the temperature range between 250-650 oC to reveal good electrical conductivity and matched thermal expansion to the components used for intermediate-temperature solid oxide fuel cell (SOFC). Interface reactions occurred during sintering either at 750 oC or 900 oC could enhance the diffusion of Zr, Y and Bi ions, to form effective diffusion zone for stabilizing δ-Bi2O3 matrix. The results showed a dual-structure of 66 mol% 8YSZ-34 m% Bi2O3 with up to 76% δ-phase content was stabilized by solid-state sintering, surpassing a bulk conductivity of 10−2 Scm−1 at 500 oC. The coefficient of thermal expansion value exhibited by the composite between 25 oC and 650 oC was found to be 10-12.2 ppm*K−1, which was in good agreement with that of CeO2-based electrolyte. Thus, it was confirmed that the addition of ZrO2 could stabilize the Bi2O3, by improving its capability as a solid electrolyte for intermediate temperature SOFC
참고문헌 (24)
- P. Shuk, , Solid State Ionics, 89, pp.179~196 (1996)
- T. C. Kuo, , J. Europ. Ceram. Soc, 31, pp.3153~3158 (2011)
- J. Y. Park, , J. Am. Ceram. Soc, 88, pp.2402~2408 (2005)
- J.S. Ahn, , J. Electrochem. Soc, 157, pp.B376~B382 (2010)
- K. Z. Fung, , Solid State Ionics, 52, pp.199~211 (1992)
- S. E. Lin, , J. Europ. Ceram. Soc, 31, pp.1975~1985 (2011)
- D.E. Alman, , Fuel Cell Technology, Markes and Commercialization, 2004 Fuel Cell Seminar Abstracts, pp.901604~ (2005), Albany Research Center
- X. Ding, , J. Electroceram, 18, pp.317~322 (2007)
- A. C. Khandhar, "US patent No. 5,171,645", ~ (1992)
- R. C. Weast, "CRC handbook of chemistry and physics" (1981), CRC Press
- T. Takahashi, , J. Electrochemical Soc, 10, pp.1563~1569 (1977)
- K. Z. Fung, , J. Am. Ceram. Soc, 74, pp.1970~1980 (1991)
- R. K. Datta, , Z. Anorg. Allg. Chem, 383, pp.328~337 (1971)
- K. Keizer, , Ceramurgia Int, 5, pp.143~147 (1979)
- D. W. Joh, , J. Power Sources, 320, pp.267~273 (2016)
- T. H. Yeh, , Mater. Res. Bul, 45, pp.318~323 (2010)
- H. Kim, , Ph. D., pp.2004
- GE Kusuma, , MS, pp.2008
- Y. W. Lai, , Materials, 9, pp.863~ (2016)
- N. Jiang N, , Solid State Ionics, 150, pp.347~353 (2002)
- K. Huang, , Solid State Ionics, 89, pp.17~24 (1996)
- M. Miyayama, , Mater. Res. Bull, 21, pp.1215~1222 (1986)
- M. Miyayama, , J. Mater. Sci, 22, pp.2624~2628 (1987)
- C. C. T. Yang, , Mat. Chem. Phy, 81, pp.134~142 (2003)