Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Characterization of LSGM Solid Electrolyte for Solid Oxide Fuel Cell

연료전지용 LSGM 페로브스카이트계 전해질의 합성 및 특성 연구

  • Seong, Young-Hoon (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Jo, Seung-Hwan (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Muralidharan, P. (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Kim, Do-Kyung (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology(KAIST))
  • 성영훈 (한국과학기술원 신소재공학과) ;
  • 조승환 (한국과학기술원 신소재공학과) ;
  • ;
  • 김도경 (한국과학기술원 신소재공학과)
  • Published : 2007.12.31
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Abstract

The family of (Sr,Mg)-doped $LaGaO_3$ compounds, which exhibit high ionic conductivity at $600-800^{\circ}C$ over a wide range of oxygen partial pressure, appears to be promising as the electrolyte for intermediate temperature solid oxide fuel cells. Conventional synthesis routes of (Sr,Mg)-doped $LaGaO_3$ compounds based on solid state reaction have some problems such as the formation of impurity phases, long sintering time and Ga loss during high temperature sintering. Phase stability problem especially, the formation of additional phases at the grain boundary is detrimental to the electrical properties of the electrolyte. From this point of view, we focused to synthesize single phase (Sr,Mg)-doped $LaGaO_3$ electrolyte at the stage of powder synthesis and to apply relatively low heat-treatment temperature using novel synthesis route based on combustion method. The synthesized powder and sintered bulk electrolytes were characterized by XRD, TG-DTA, FT-IR and SEM. AC impedance spectroscopy was used to characterize the electrical transport properties of the electrolyte with the consideration of the contribution of the bulk lattice and grain boundary to the total conductivity. Finally, relationship between synthesis condition and electrical properties of the (Sr, Mg)-doped $LaGaO_3$ electrolytes was discussed with the consideration of phase analysis results.

Keywords

References

  1. B. C. H. Steele, 'Materials for Fuel-cell Technologies,' Nature., 414 345-52 (2001) https://doi.org/10.1038/35104620
  2. B. C. H. Steele, 'Appraisal of CeGdO Electrolytes for ITSOFC Operation at 500oC,' Solid State Ionics., 129 95-110 (2000) https://doi.org/10.1016/S0167-2738(99)00319-7
  3. Ishihara, T., H. Matsuda, and Y. Takita, 'Doped $LaGaO_3$ Perovskite-Type Oxide as a New Oxide Ionic Conductor,' J. Am. Ceram. Soc., 116 [9] 3801-03 (1994) https://doi.org/10.1021/ja00088a016
  4. Djurado, E. and M. Labeau, 'Second Phases in Doped Lanthanum Gallate Perovskites,' J. Eur. Ceram. Soc., 18 [10] 1397-404 (1998) https://doi.org/10.1016/S0955-2219(98)00016-8
  5. Schulz, O. and M. Martin, 'Preparation and Characterisation of $La_{1-x}Sr_xGa_{1-y}Mg_yO_{3-(x+y)/2}$ for the Investigation of Cation Diffusion Processes,' Solid State Ionics., 135 [1-4] 549-55 (2000) https://doi.org/10.1016/S0167-2738(00)00436-7
  6. L Cong, L., et al., 'Synthesis and Characterization of IT-electrolyte with Perovskite Structure $La_{0.8}Sr_{0.2}Ga_{0.85}Mg_{0.15}O_{3-d}$ by Glycine-nitrate Combustion Method,' J. Alloys Compd., 348 [1-2] 325-31 (2003) https://doi.org/10.1016/S0925-8388(02)00859-9
  7. Min Shi, Ning Liu, Yudong Xu, Yupeng Yuan, P. Majewski, and F.Aldinger, 'Synthesis and Characterization of Sr-and Mg- Doped $LaGaO_3$ by Using Glycine Nitrate Combustion Method,' J. Alloys Compd., 425 348-52 (2006) https://doi.org/10.1016/j.jallcom.2006.01.024
  8. Rambabu, B., et al., 'Innovative Processing of Dense LSGM Electrolytes for IT-SOFC's,' J. Power Sources, 159 [1] 21-8 (2006) https://doi.org/10.1016/j.jpowsour.2006.04.107
  9. Huang, K.Q., R.S. Tichy, and J.B. Goodenough, 'Superior Perovskite Oxide-ion Conductor; Strontium- and Magnesium-doped $LaGaO_3$: I, Phase Relationships and Electrical Properties,' J. Am. Ceram. Soc., 81 [10] 2565-75 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02662.x
  10. Huang, K.Q., R.S. Tichy, and J.B. Goodenough, 'Superior Perovskite Oxide-ion Conductor; Strontium- and Magnesium-doped $LaGaO_3$: II, ac Impedance Spectroscopy,' J. Am. Ceram. Soc., 81 [10] 2576-80 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02663.x
  11. Huang, K.Q., R. Tichy, and J.B. Goodenough, 'Superior Perovskite Oxide-ion Conductor; Strontium- and Magnesium-doped $LaGaO_3$: III, Performance Tests of Single Ceramic Fuel Cells,' J. Am. Ceram. Soc., 81 [10] 2581-85 (1998) https://doi.org/10.1111/j.1151-2916.1998.tb02664.x
  12. Glavatskikh, T.Y., et al., 'Synthesis, Structure, Microstructure, and Electrical Conductivity of $(La,Sr)(Ga,Mg)O_3$-delta Oxide-ion-conducting Ceramics,' Inorg. Mater., 37 [6] 647-50 (2001) https://doi.org/10.1023/A:1017532820748
  13. Gorelov, V.P., et al., 'The Effect of Doping and Processing Conditions on Properties of $La_{1-x}Sr_xGa_{1-y}Mg_yO_{3-a}$,' J. Eur. Ceram. Soc., 21 [13] 2311-17 (2001) https://doi.org/10.1016/S0955-2219(01)00203-5
  14. Li, Z.C., et al., 'Synthesis and Characterization of $La_{0.85}Sr_{0.15}Ga_{0.85}Mg_{0.15}O_{3-d}$ Electrolyte by Steric Entrapment Synthesis Method,' J. Eur. Ceram. Soc., 26 [12] 2357-64 (2006) https://doi.org/10.1016/j.jeurceramsoc.2005.04.028
  15. O. Cinar, O. Berkem, and A. G. Mehmet, 'X-ray Single Phase LSGM at $1350^{\circ}C$,' J. Eur. Ceram. Soc., 27 [2-3] 599-604 (2007) https://doi.org/10.1016/j.jeurceramsoc.2006.04.115

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