Abstract
A new high performance ceramic solid oxide fuel cell (SOFC) anode, Ca- and Co-doped yttrium chromite (YCCC)–samaria-doped ceria (SDC) composite, that resists deactivation by sulfur and does not show degradation during multiple reduction–oxidation cycles is developed. The electrocatalytic activity of the YCCC–SDC anodes in yttria-stabilized zirconia (YSZ) electrolyte-supported cells toward hydrogen oxidation is comparable to that of the Ni/YSZ anode. YCCC–SDC exhibits superior sulfur tolerance showing less than 10% increase in electrode resistance, fully reversible, upon exposure to 20 ppm H 2S. The excellent redox tolerance is attributed to the dimensional and chemical stability of the YCCC exhibiting minimal isothermal “chemical” expansion.
Published Version
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