Silver-BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} composites as cathode materials for SOFCs using BaCeO{sub 3}-based electrolytes

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1836549· OSTI ID:220866

Hu, H; Liu, M ^[1]

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1. Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering

Composites of silver and BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} ceramics have been studied as cathode materials for intermediate-temperature solid oxide fuel cells using BaCeO{sub 3}-based electrolytes. Results indicate that the electrochemical properties of these composites are quite sensitive to the composition and microstructure of the electrodes. The optimal silver content of the composites seems to fall within the range of 50 to 70 volume percent, depending on the particular microstructure of the electrode. As compared to pure silver electrodes, the composite electrodes show better adhesion to the electrolyte, higher exchange current densities, and lower cathodic overpotentials under various conditions. The observed high performance of the composite electrodes is attributed primarily to the fine-grained microstructure and high porosity of the composites, as the BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} phase inhibits grain growth of the silver phase in the composites.

• Sponsoring Organization: USDOE
• OSTI ID: 220866
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 143; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
40 CHEMISTRY
BARIUM OXIDES
CATHODES
CERIUM OXIDES
COMPOSITE MATERIALS
CURRENT DENSITY
ELECTRIC POTENTIAL
ELECTROCHEMISTRY
GADOLINIUM OXIDES
MICROSTRUCTURE
SILVER
SOLID ELECTROLYTE FUEL CELLS
STOICHIOMETRY