Polarization Resistance of La0.85Ca0.15MnO3 Cathodes for Solid Oxide Fuel Cells (SOFCs) Measured Using Patterned Electrodes

Journal Article · Sun Apr 25 04:00:00 EDT 2010 · ECS Transactions

DOI:https://doi.org/10.1149/1.3502345· OSTI ID:1037968

Miara, Lincoln J; Yoon, Kyung J; Topping, Stephen; Saraf, Laxmikant V; Pal, Uday B; Gopalan, Srikanth

Patterned cathodes of calcium-doped lanthanum manganite (LCM) were fabricated on polycrystalline yttria-stabilized zirconia (YSZ) substrates by RF magnetron sputtering and photolithographic techniques. Samples were generated with a constant electrode/electrolyte contact area but different three phase boundary (TPB) lengths (lTPB's). Electrochemical impedance spectroscopy (EIS) was performed in the oxygen partial pressure (pO2) and temperature range of 10-3 atm to 1.00 atm and 600-800 C respectively. The area specific polarization resistance, Rp, was found to scale linearly with the inverse of lTPB, suggesting that the TPB is the active region for oxygen reduction. The resistivity decreased with increased temperature and pO2 and showed an activation energy of 1.17 +/- 0.03 eV.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1037968
• Report Number(s): PNNL-SA-75222; 37499; KP1704020
• Journal Information: ECS Transactions, Journal Name: ECS Transactions Journal Issue: 23 Vol. 28; ISSN 1938-5862
• Country of Publication: United States
• Language: English

Related Subjects

(SOFCs)
30 DIRECT ENERGY CONVERSION
ACTIVATION ENERGY
CATHODES
Cathodes
Cells
ELECTRODES
Electrodes
Environmental Molecular Sciences Laboratory
Fuel
IMPEDANCE
LANTHANUM
La0.85Ca0.15MnO3
MAGNETRONS
Measured
OXYGEN
Oxide
PARTIAL PRESSURE
POLARIZATION
Patterned
Polarization
Resistance
SOLID OXIDE FUEL CELLS
SPECTROSCOPY
SPUTTERING
SUBSTRATES
Solid