An anode for solid oxide fuel cells: NiO+(Ce0.9Ca0.1O1.9)0.25(YSZ)0.75 solid solution

A (CCO)(0.25)(YSZ)(0.75) solid solution (YSZ is Y2O3-stabilized ZrO2; CCO is an abbreviation of Ce0.9Ca0.1O1.9) was successfully synthesized by a solid-state method. A composite anode material, NYCx (60 wt% NiO+40 wt% (CCO)(x)(YSZ)(1-x)), for SOFCs (solid oxide fuel cells) was prepared. XRD results suggest that a solid solution reaction occurs between YSZ and CCO after sintering at 1400 degreesC for 10 h. From the impedance results, the conclusion can be drawn that the (CCO)(0.25)(YSZ)(0.75) solid solution is a mixed conductor (ionic and electronic). Its total conductivity is greater than that of YSZ. The NYCx (x>0) anodes exhibited better performance than the commonly used Ni+YSZ anode with regards to overpotential and anode interfacial impedance, with the NYC0.25 anode exhibiting the best performance (C) 2003 Elsevier B.V. All rights reserved.

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