Electrochemical performance and stability of the cathode for solid oxide fuel cells. V. high performance and stable Pr₂NiO₄ as the cathode for solid oxide fuel cells

Journal Article · Fri Mar 23 00:00:00 EDT 2012 · Electrochimica Acta

DOI:https://doi.org/10.1016/j.electacta.2012.03.067· OSTI ID:1158530

Zhou, Xiao-Dong ^[1]; Templeton, Jared W. ^[2]; Nie, Zimin ^[2]; Chen, H. ^[1]; Stevenson, Jeffry W. ^[2]; Pederson, Larry R. ^[2]

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1. Univ. of South Carolina, Columbia, SC (United States)
2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The polarization loss due to oxygen reduction at the cathode in solid oxide fuel cells is a thermally activated process; therefore, as temperature is lowered, the loss becomes substantial. Highly active cathodes have been investigated by several groups; equally important, if not more, is the stability of these electrodes. The high performance and stable Pr₂NiO₄ cathode was studied by impedance spectroscopy and dc current–potential sweeping methods. The power density in Pr₂NiO₄-based anode supported button cells was in the range between 0.65 and 0.7 W/cm² at 750 degrees C at the external load of 0.8 V. The degradation rate at 0.8 V was approximately 3% per 1000 h up to 2000 h. The electrode resistance is a function of external loads, thus also varies with current densities. The relationship between electrode resistance and external loads is non-linear, which may changes in lattice oxygen nonstoichiometry of the cathodes.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1158530
• Report Number(s): PNNL-SA-89025; AA6040000
• Journal Information: Electrochimica Acta, Vol. 71; ISSN 0013-4686
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

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