MIEC Electrochemical Performances as SOFC or SOEC Electrodes

MIEC Electrochemical Performances as SOFC or SOEC Electrodes 

For such a circuit, the impedance Z is given by the following equation  

In the complex representation (Nyquist diagram), it corresponds to the equation of a circle centered on R/2 with a radius of R/2. The impedance Z tends toward the material intrinsic resistance R when the frequency tends toward 0 and toward 0 when the frequency tends towards the infinite. The maximum of amplitude of the imaginary part Z is obtained at the resonance  

In case of symmetrical cell, the electrode response corresponds to twice the polarization resistance Rp since there are two electrodes. When normalized to the surfece (S), one can extract the area-specific resistance (ASR) (i2 cm )  

The current target for air electrode is to get an ASR lower than O.lSil cm at 

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