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Coprecipitation Synthesis and Characterization of La0.8Sr0.2Ga0.8−x Mg0.2Co x O2.8 for Intermediate Temperature Solid Oxide Fuel Cell Electrolytes

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Abstract:

La0.8Sr0.2Ga0.8−x Mg0.2Co x O2.8 (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 °C with the total weight loss of approximately 35%. The LSGMC samples sintered at 1350 °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 × 10−1 S cm−1 at 700 °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.

Keywords: CARBONATE COPRECIPITATION; DOPED-LAGAO3; ELECTROLYTE; IONIC CONDUCTIVITY; SOLID OXIDE FUEL CELL

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.5406

Publication date: January 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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