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A Sol–Gel Route for the Synthesis of Bi2Ru2O7 Pyrochlore Oxide for Oxygen Reaction in Alkaline Medium

✍ Scribed by A. Kahoul; P. Nkeng; A. Hammouche; F. Naamoune; G. Poillerat

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
347 KB
Volume
161
Category
Article
ISSN
0022-4596

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✦ Synopsis

In this investigation, Bi 2 Ru 2 O 7 pyrochlore-type oxide was prepared using the Pechini process. We employed a sol+gel route, in which a solution of Ru(III) and Bi(III) in a mixture of citric acid and ethylene glycol was heated to form a polymeric precursor, followed by an annealing at higher temperatures during various periods. The oxide obtained was identi5ed by X-ray di4raction analysis. The results revealed that the formation of homogeneous oxide with a single pyrochlore structure phase occured at or above 6503C. Sample powders consisted of 5ne grains with homogeneous morphology and an average size of about 0.5 m. This new preparation procedure yielded an electrode material with improved electrochemical activity compared to those elaborated through conventional methods.

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