Bulk expansion of the anode upon oxidation is considered to be responsible
for the lack of redox stability in high-temperature solid oxide fuel
cells SOFCs . The bulk expansion of nickel-yttria stabilized zirconia
YSZ anode materials was measured by dilatometry as a function of
sample geometry, ceramic component, temperature, and temperature
cycling. The strength of the ceramic network and the degree of Ni
redistribution appeared to be key parameters of the redox behavior.
A model of the redox mechanism in nickel-YSZ anodes was developed
based on the dilatometry data and macro- and microstructural observations.
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