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Abstract
The structure stability of solid silver (Ag), is widely used current collectors for solid oxide fuel cells (SOFCs), is examined in methane-oxygen mixed gas at a furnace temperature range of 650-750 ℃. A rapid porosity formation is observed for solid Ag samples, especially with a Ni/yttria-stabilized zirconia (YSZ) anode, which is mainly attributed to simultaneous diffusion of oxygen, hydrogen and carbon monoxide into Ag bulk, followed by subsequent interaction resulting in the formation of H2O and CO2 gas. The obtained results indicate that the catalytic of Ni-YSZ anode plays an important role in the quick structure degradation of Ag under this condition. Furthermore, methane-oxygen-ration (R mix) and operated temperature have significant influence on its structure stability. It indicates that Ag may not be a good choice to be employed under SOFC conditions with hydrocarbon-air mixed gas, especially on the anode side.
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