Abstract
Abstract Misfit Ca-cobaltites of nominal composition Ca 3 Co 4 O 9-δ (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 Ω cm 2 at 800 °C in air) is in line with literature data for similar cathodes prepared by other synthetic routes.
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