Page "Fuel cell" Paragraph 39
from
Wikipedia
The high operating temperature is largely due to the physical properties of the YSZ electrolyte.
As temperature decreases, so does the ionic conductivity of YSZ.
Therefore, to obtain optimum performance of the fuel cell, a high operating temperature is required.
According to their website, Ceres Power, a UK SOFC fuel cell manufacturer, has developed a method of reducing the operating temperature of their SOFC system to 500-600 degrees Celsius.
They replaced the commonly used YSZ electrolyte with a CGO ( cerium gadolinium oxide ) electrolyte.
The lower operating temperature allows them to use stainless steel instead of ceramic as the cell substrate, which reduces cost and start-up time of the system.
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