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

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 stabili...

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Bibliographic Details
Published in:Electrochimica acta 2012-06, Vol.71, p.44-49
Main Authors: Zhou, X.-D., Templeton, J.W., Nie, Z., Chen, H., Stevenson, J.W., Pederson, L.R.
Format: Article
Language:English
Subjects:
Applied sciences
Cathode
Cathodes
Current density
Density
Direct current
Electrodes
Energy
ENERGY STORAGE
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Impedance
Reduction
Solid oxide fuel cells
Stability
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Summary: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 0.7W/cm2 at 750°C at the external load of 0.8V. The degradation rate at 0.8V was approximately 3% per 1000h up to 2000h. 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.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2012.03.067