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Synthesis of Yttria-Doped Bismuth Oxide Powder by Carbonate Coprecipitation for IT-SOFC Electrolyte

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Abstract:

Yttria-doped bismuth oxide (YBO) powders were synthesized by ammonium carbonate coprecipitation for the preparation of electrolytes of an intermediate temperature solid oxide fuel cell (IT-SOFC). The starting salts were yttrium and bismuth nitrate. The crystal structures and the morphological characteristics of the particles were analyzed by XRD and SEM, respectively. The ionic conductivity of the sintered pellet was measured by an electrochemical impedance analyzer. The size of the calcined YBO powders were in the range of 20–100 nm as measured by SEM images. The YBO pellets had a face-centered cubic structure, and their crystallite size was about 54–88 nm. The ionic conductivity of the YBO pellets sintered at 800 °C was observed to be 2.7 × 10−1 Scm−1 at 700 °C. The ball-milling of the YBO powder before it was pelletized was found to have been unrequired probably because of a good sinterability of the YBO powders that was prepared via the ammonium carbonate coprecipitation method. The results showed that the ammonium carbonate coprecipitation process could be used as the cost-efficient method of producing YBO electrolytes for IT-SOFC.

Keywords: AMMONIUM CARBONATE COPRECIPITATION; ELECTROLYTE; IONIC CONDUCTIVITY; SOFC; YBO

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3199

Publication date: January 1, 2011

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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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