Evaluation of Gadolinium Doped Barium Zirconate Electrolyte for Solid Oxide Fuel Cell

In this work gadolinium doped barium zirconate (gadolinium oxide = 0, 5, 10, 15 and 20% mol) was prepared by Pechini method from nitrate precursors. The powders were studied by simultaneous thermal analysis, X-ray diffraction, and scanning electron microscopy. These powders were then uniaxially pres...

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Main Author: de Florio, Daniel Zanetti
Format: Conference Proceeding
Language:English
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Summary:In this work gadolinium doped barium zirconate (gadolinium oxide = 0, 5, 10, 15 and 20% mol) was prepared by Pechini method from nitrate precursors. The powders were studied by simultaneous thermal analysis, X-ray diffraction, and scanning electron microscopy. These powders were then uniaxially pressed in cylindrical discs. The pellets were sintered at temperatures of 1773 K/1 h and 1523 K/1 h with and without amounts of boric acid as sintering aid, respectively. The parallel faces of each sample were painted with platinum paste and electrically characterized by impedance spectroscopy in the frequency range from 1 MHz to 1Hz, under static air and standard mixture (3% hydrogen/97% nitrogen) flow, up to 1273 K. The main results indicate that dense (>96 % of theoretical density) barium zirconate perovskite phase was obtained for samples liquid phase sintered with high electrical conductivity values.
ISSN:1938-5862
1938-6737
DOI:10.1149/06801.0497ecst