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

作者：Fulgencio Erik B G A; Melo Klivia P V; Silva Rinaldo M; Grilo Joao P F; Caignaert Vincent; Cesario Moises R; Campos Liszandra F A; Macedo Daniel A^*

来源：Ceramics International, 2017, 43(12): 9564-9567.

DOI：10.1016/j.ceramint.2017.04.099

• Powders: solid state reaction
• X-ray methods
• Impedance
• Fuel cells
• Ca3CO4O9-delta

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.

• 出版日期2017-8-15