Preparation and Investigation of Cu Doped(Pr_0.5Nd_0.5)_0.7Ca_0.3CrO_3–δ Ceramic Interconnect Materials

Abstract:

(Pr_0.5Nd_0.5)_0.7Ca_0.3Cr_1-xCu_xO_3–δ(PNCCCx x=0, 0.5, 0.1, 0.15，0.2 ) interconnect material and electrolyte powders of Sm_0.2Ce_0.8O_1.9 (SDC) were synthesized by citric acid nitrates self-propagating combustion methodThe phase and microstructure of the sintering samples were investigated by X-ray diffraction and scanning electron microscope, respectively. The electrical conductivity of the samples were measured by four-probe technique. The results indicated that there is no new-phase were detected after co-firing between Cu-doping PNCC and SDC at 1350°C for 5 h. In air or H₂ atmosphere, the conductivity of the sintering ceramics increasing with temperature, as well as the Cu-doped contents. At 800°C, the conductivity for PNCCC0.05 reached 37.54S/cm in air, and the maximum of PNCCC/SDC reached 44.52 S/cm in air 30.68 S/cm in H₂, respectively. The average thermal expansion coefficient of the series ceramics is between10.4×10^-6 K^-1 to 10.8×10^-6K^-1 at the RT-1000°C, which is close to that of the SDC electrolyte. Our results indicate that the PNCCC compounds is a very promising interconnect material for intermediate solid oxide fuel cells.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 2950-2958
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.2950
• Online since: October 2013
• Authors: Qing Wen Gu, Yong Hong Chen*, Dong Tian, Xiao Yong Lu, Yan Zhi Ding, Bin Lin
• Keywords: Ceramic Interconnect Materials, Cu Dopant, Solid Oxide Fuel Cell (SOFC), TEC

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