The Solid Oxide Fuel Cell is a particular case in which an oxide is used as a conductor. Once i've heard that oxides usually aren't good conductors but it turned out that a lot of oxides are conductors. What i am asking is :

  1. How can i know if a oxide is a conductor or not?

  2. If there isn't any conduction band since it's not a metal, how do the electrons move and how does the SOFC work?

Thank you.

  • $\begingroup$ Not all conductors work by conduction of electrons - ionic conductors are a thing. I think the most famous one is alpha phase of AgI. For oxides, off the top of my head I can think of YSZ and beta-alumina. Basically there are holes in the crystal structure which let oxide (or other) ions move. I'd say though that it's difficult to predict whether it's a conductor without knowing the system. $\endgroup$ – orthocresol Aug 25 '16 at 9:02

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