Oxygen ionic conductor

It is noteworthy that the ionic conductivity in heavily doped 1x1, Sr CoO j, (LSC) and its derivatives is comparable to, or even higher than, that of most oxygen ionic conductors. In contrast. La, Sr MnO3 g (LSM) has a relatively low ionic conductivity as compared to Lii Sr CoO j g however, the thermal expansion of LSM is compatible with that of YSZ ( = (10-12) x 10 K ), whereas the CTEs of Lai Sr CoO j g are excessively high (>20 x 10 K )- Numerous efforts are therefore made to reduce thermal expansion of cobaltites, particularly via B-site doping. 

Figure 1. Effect of Temperature on Ionic Conductivity of Oxygen Ionic Conductors for SOFC...

These sensors usually have four different components a diffusion barrier, a cathode, an anode and the electrolyte. The diffusion barrier is a key element in the sensor because it limits the gas flow to the cathode. The electrolyte is an oxygen ionic conductor. The most common material used as an ionic conductor is Yttria-stabilized zirconia (YSZ), always employed at temperatures over 300°C. Electrodes (anode and cathode) are usually made of conductive materials. The electrodes provide the necessary electrons for the reduction-oxidation reaction. In this reaction, ambient oxygen is incorporated in a vacancy in the electrolyte and forms an ion. Platinum is one of the most widely-used materials for electrodes because it shows good performance at... 

Intrinsic oxygen ionic conductors 140 7.2.1. Oxygen sensors 166... 

Intrinsic oxygen ionic conductors 4.2.1. Bi20 -based electrolytes... 

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