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Misfit Ca-cobaltite from a mixture of mollusk shells and cobalt oxide as potential SOFC cathode material

Abstract : Misfit Ca-cobaltites of nominal composition Ca3Co4O9-delta (C349) have attracted great attention as Solid Oxide Fuel Cell (SOFC) cathode material. The present work reports, for the first time, the solid-state synthesis of C349 powders from a mixture of cobalt oxide and mollusk shells, a natural source of calcium carbonate. The synthesized material was studied by X-ray diffraction, with Rietveld refinement of the XRD data, and Transmission Electron Microscopy (TEM). Screen-printed C349 porous electrodes were fired on both sides of dense gadolinia-doped ceria ceramics and electrochemically characterized by impedance spectroscopy at 700-800 C in air. The measured area specific resistance (ASR of 1.47 Omega cm(2) at 800 degrees C in air) is in line with literature data for similar cathodes prepared by other synthetic routes.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02175425
Contributor : Elisabeth van T Hof <>
Submitted on : Friday, July 5, 2019 - 5:01:31 PM
Last modification on : Wednesday, August 28, 2019 - 3:08:04 PM

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Erik B. G. A. Fulgencio, Klivia P. V. Melo, Rinaldo M. Silva, Joao P. F. Grilo, Vincent Caignaert, et al.. Misfit Ca-cobaltite from a mixture of mollusk shells and cobalt oxide as potential SOFC cathode material. Ceramics International, Elsevier, 2017, 43 (12), pp.9564-9567. ⟨10.1016/j.ceramint.2017.04.099⟩. ⟨hal-02175425⟩

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