The SOFC electrolyte is a ceramic membrane, often yttrium stabilized zirconia (YSZ). The electrodes are porous, conducting metal-ceramics. The transfer ion is O2-. To get the ion conductivity necessary, the SOFC system operates at high temperatures, usually 1000C. There are some new methods being developed to reduce that to 500C to 800C. Because of the high temperature operation, a catalyst is not needed at the electrode-electrolyte interface.

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