Coprecipitation Synthesis and Characterization of La0.8Sr0.2Ga0.8-xMg0.2CoxO2.8 for Intermediate Temperature Solid Oxide Fuel Cell Electrolytes
- Authors
- Lee, Jin Goo; Yoon, Hyon Hee
- Issue Date
- Jan-2012
- Publisher
- AMER SCIENTIFIC PUBLISHERS
- Keywords
- Solid Oxide Fuel Cell; Carbonate Coprecipitation; Electrolyte; Doped-LaGaO3; Ionic Conductivity
- Citation
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.12, no.1, pp.769 - 774
- Journal Title
- JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
- Volume
- 12
- Number
- 1
- Start Page
- 769
- End Page
- 774
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/16667
- DOI
- 10.1166/jnn.2012.5406
- ISSN
- 1533-4880
- Abstract
- La0.8Sr0.2Ga0.8-xMg0.2CoxO2.8 (LSGMC) electrolyte powders containing different amount of Co (0 <= x <= 0.15) were prepared by ammonium carbonate coprecipitation method. The precursors, the calcined powders, and the sintered pellets were characterized by thermogravimetry/differential thermal analysis, X-ray diffractometry, scanning electron microscopy, and an impedance analyzer. The thermal decomposition of the LSGMC precursors was completed at around 900 degrees C with the total weight loss of approximately 35%. The LSGMC samples sintered at 1350 degrees C consisted of the pure perovskite structure. The ionic conductivity was significantly improved by Co doping for the Ga-site of the La0.8Sr0.2Ga0.8Mg0.2O2.8 (LSGM) electrolytes. The ionic conductivity of LSGMC (x = 0.1) exhibited the highest values of 1.6 x 10(-1) S cm(-1) at 700 degrees C with an activation energy for the oxide-ion conduction of 0.29 eV. The results of this study indicated that the Co-doped LSGM electrolytes had excellent properties for use as an electrolyte in an IT-SOFC and the ammonium carbonate coprecipitation process could be employed as the efficient method for the preparation of the Co-doped LSGM electrolytes.
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