Ceramic Protonic Electrolyte Supported Fuel Cell for Operation with Methane and Ethanol

Author(s)

Muccillo, R. ; Oliveira, O. R. ; dos Santos, E. ; de Florio, D. Z. ; Fonseca, F. C. ; Muccillo, E. N. S. ; Eguchi, K ; Singhai, SC ; Yokokawa, H ; Mizusaki, H

• Document type: Journal article
• Source: SOLID OXIDE FUEL CELLS 10 (SOFC-X), PTS 1 AND 2; v. 7, n. 1, p. 2-pg., 2007-01-01.

Abstract

Unitary planar solid oxide fuel cells with gadolinium-doped barium cerate protonic conductor solid electrolyte, slurry-coated thin film La0.6Ca0.4Fe0.8Co0.2O2.74 anode, and thin film Pt cathode have been put into operation in the temperature range 500-900 degrees C using different fuel-oxidant combinations: H-2-air, (30% H-2, 70% N-2)-air, (10% CH4, 90% Ar)-air, and C2H5OH-air. The sintered ceramic protonic conductors with dimensions phi=25mm and I mm thickness were characterized by determination of density by He picnometry, structural phase by X-ray diffraction and electrical behavior from 500 to 1000 degrees C by electrochemical impedance spectroscopy in the 5 Hz - 13 MHz frequency range. An experimental setup was been built for testing electrolyte-supported cells fueled by H-2, H-2-Ar, CH4-Ar, C2H5O-N-2- Several ceramic sealants were tested for allowing thermal cycling of the cells without cracking. The OCV time dependence, the current-voltage plot, and the Z ''(omega) x Z'(omega) impedance diagrams, in the 300-900 degrees C range, show the possibilities of operation of the cell. (AU)

• FAPESP's process: 05/53241-9 - Study of intergranular phenomena in ceramic materials
• Grantee: Reginaldo Muccillo
• Support Opportunities: Research Projects - Thematic Grants