掺碱土金属的双稀土铬酸盐(Pr0.5Nd0.5)0.7M0.3CrO3-δ(M=Sr, Ca)用于SOFC连接材料

doi:10.11896/j.issn.1005-023X.2018.16.005

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Abstract Using EDTA-pechini process to synthesize the primary powder, novel binary rare earth interconnect materials (Pr_0.5Nd_0.5)_0.7Sr_0.3CrO_3-δ (PNSC) and (Pr_0.5Nd_0.5)_0.7Ca_0.3CrO_3-δ (PNCC) for solid oxide fuel cells (SOFCs) were successfully prepared after sintering at 1 400 ℃ in air. The particle size distribution, sintering shrinkage, structure, morphologies, electrical conductivity and thermal expansion were characterized by laser particulate size description analyzer, thermal expansion dilatometer, X-ray diffraction, scanning electron microscopy and standard DC four-probe technique. The results indicate that PNCC has higher sintering ability than PNSC. The sintering shrinkage of PNCC mostly happens at the temperature range of 900 ℃ to 1 030 ℃, while the shrinkage of PNSC happens only above 1 250 ℃. The PNCC sample has a high relative density of 97.2% after sintered at 1 400 ℃ for 4 h, however, the PNSC sample only has a lower relative density of 76.5%. The obvious different sintering ability may relate to the second phases of CaCrO₄ or SrCrO₄, which appears during the sintering process of PNCC or PNSC. The electrical conductivities of PNSC and PNCC can reach up to 50.4 S·cm^-1 and 40.9 S·cm^-1, respectively, at 850 ℃ in air, and they both obey the theory of small polaron conduction. The thermal expansion coefficient (TEC) value of PNCC is 9.8×10^-6 K^-1, very close to that of YSZ. These investigations have indicated that PNCC, better than PNSC, is a promising interconnect material for SOFCs.

Key words： solid oxide fuel cell (SOFC) interconnect material sintering performance electrical conductivity perovskite chromite

Published: 18 September 2018

CLC number:

TM911

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	Articles by authors
	WANG Songlin
	XU Xiangqi
	CHEN Zipan
	Meng Guangyao

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WANG Songlin,XU Xiangqi,CHEN Zipan, et al. Alkaline-earth-metal-doped Binary Rare Earth Chromites (Pr_0.5Nd_0.5)_0.7M_0.3CrO_3-δ (M=Sr, Ca): Novel Interconnect Materials for SOFC[J]. Materials Reports, 2018, 32(16): 2728-2732.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.16.005 OR http://www.mater-rep.com/EN/Y2018/V32/I16/2728

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