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Research Article | Open Access

Synthesis and characterization of Zr0.85Y0.15O1.925-La9.33Si6O26 composite electrolyte for application in SOFCs

Chaofeng LIUa, Hong ZHANGa, Junxiao XIAa, Zhicheng LIa,b,*( )
School of Materials Science and Engineering, Central South University, Changsha 410083, China
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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Abstract

Composite oxide ionic conductors consisting of Zr0.85Y0.15O1.925 (YSZ) and La9.33Si6O26 (LSO) have been synthesized by a modified coprecipitation method. X-ray diffraction, electron microscope, and complex impedance were adopted to investigate the phase component, microstructures, and conductivities, respectively. The results show that the average grain sizes of the composite powders and as-sintered pellets are less than 20 nm and 200 nm, respectively. The conductivity of the composite materials composed of 94 wt% YSZ and 6 wt% LSO is 0.215 S/cm at 700 ℃. The conductivity of the composite is three times higher than that of the polycrystalline YSZ and has two orders in magnitude higher than that of the polycrystalline LSO at 700 ℃. By analyzing the impedance spectra and modulus spectra, the grain-boundary effect on the conductivity improvement is investigated and the conductive mechanisms of the composite materials are discussed.

Keywords

Zr0.85Y0.15O1.925La9.33Si6O26composite materialscoprecipitation synthesisoxygen ionic conductivity

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Journal of Advanced Ceramics
Volume 1 Issue 4,
December 2012
Pages 327-335
DOI: 10.1007/s40145-012-0033-x
Cite this article:
LIU C, ZHANG H, XIA J, et al. Synthesis and characterization of Zr0.85Y0.15O1.925-La9.33Si6O26 composite electrolyte for application in SOFCs. Journal of Advanced Ceramics, 2012, 1(4): 327-335. https://doi.org/10.1007/s40145-012-0033-x

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Received: 16 November 2012
Revised: 09 December 2012
Accepted: 11 December 2012
Published: 09 January 2013
© The author(s) 2012
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