Interfacial polarization characteristics of Pt{vert_bar}BaCe{sub 0.8}Gd{sub 0.2}O{sub 3}{vert_bar}Pt cells at intermediate temperatures

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1838048· OSTI ID:562217

Hu, H; Liu, M ^[1]

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

Impedance spectroscopy of Pt{vert_bar}BaCe{sub 0.8}Gd{sub 0.2}O{sub 3}{vert_bar}Pt cells indicates that both mass and charge-transfer influence the electrode kinetics of the interfacial reactions. Charge-transfer appears to dominate the electrode kinetics when the partial pressure of oxygen is sufficiently high, whereas mass transfer seems to be rate limiting at low oxygen partial pressures. Under the influence of an applied dc bias, concentration polarization at the cathode is more severe than that at the anode. In a H{sub 2}-containing atmosphere, the electrode kinetics seem to be limited primarily by charge-transfer. Further, water vapor has a significant effect on the electrode kinetics. In an O{sub 2}-containing atmosphere, the introduction of 3 volume percent (v/o) H{sub 2}O dramatically increases the interfacial resistances. In contrast, in a H{sub 2}-containing atmosphere the presence of 3 v/o H{sub 2}O significantly reduces the interfacial resistances. Overall, the interfacial resistances are the factors limiting the performance of intermediate-temperature solid oxide fuel cells based on BaCe{sub 0.8}Gd{sub 0.2}O{sub 3} electrolytes. Minimizing polarization resistance arising from both charge and mass transfer is the key to achieving high-performance solid oxide fuel cells.

• Sponsoring Organization: National Science Foundation, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
• OSTI ID: 562217
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 10 Vol. 144; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
BARIUM OXIDES
CERIUM OXIDES
ELECTRIC CONDUCTIVITY
ELECTRODES
GADOLINIUM OXIDES
PERFORMANCE
PLATINUM
POLARIZATION
SOLID ELECTROLYTE FUEL CELLS