Synthesis and Characterization of La₁₀Si₆O₂₇ and Ce_0.9Gd_0.1O_1.95 Solid Oxide Fuel Cell Electrolyte Material

Abstract:

A Composite oxide ionic conductor consisting of La₁₀Si₆O₂₇ (LASIO) and Ce_0.9Gd_0.1O_1.95 (GDC) was synthesized by a modified sol-gel method. The La₁₀Si₆O₂₇ powders prepared by modified sol-gel synthesis were coated with GDC gel and latter calcined to form a La₁₀Si₆O₂₇ - Ce_0.9Gd_0.1O_1.95 composite material. The structural and microstructural properties of the composite were investigated using powder XRD, SEM and TMA. EIS was conducted in air on the sintered pellets to evaluate the electrochemical performance of the pellets. The conductivity of the composite electrolyte at 973 K was 26 mS /cm which is two orders of magnitudes higher than that for the pure LASIO but lower than that of the GDC (30 mS/cm). The thermal expansion of the composite electrolyte is similar to that obtained for the LASIO.

• Periodical: Applied Mechanics and Materials (Volumes 789-790)
• Pages: 43-47
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.789-790.43
• Online since: September 2015
• Authors: Daniel Setsoafia, Peter Hing, Andrew Jung, Aminul Islam, Abul Kalam Azad, Lim Chee Lim
• Keywords: Ce_0.9Gd_0.1O_1.95, Composite Materials, La₁₀Si₆O₂₇, Oxygen Ion Conductivity, Sol-Gel Synthesis

References

[1] K. Sasaki, et al., Fuel Cells SOFC Alternative Approaches Electroytes, Electrodes, Fuels, (2013).

[2] S. Hui, et al., A brief review of the ionic conductivity enhancement for selected oxide electrolytes. Journal of Power Sources, 2007. 172(2): pp.493-502.

DOI: 10.1016/j.jpowsour.2007.07.071

[3] C. Veranitisagul, et al., Electrolyte materials for solid oxide fuel cells derived from metal complexes: Gadolinia-doped ceria. Ceramics International, 2012. 38(3): pp.2403-2409.

DOI: 10.1016/j.ceramint.2011.11.006

[4] A. Aguadero, et al., Materials development for intermediate-temperature solid oxide electrochemical devices. Journal of Materials Science, 2012. 47 (9): pp.3925-3948.

DOI: 10.1007/s10853-011-6213-1

[5] C. Zhang, et al., Ionic conductivity and its temperature dependence of atmospheric plasma-sprayed yttria stabilized zirconia electrolyte. Materials Science and Engineering: B, 2007. 137(1-3): pp.24-30.

DOI: 10.1016/j.mseb.2006.10.005

[6] J. Xue, et al., Combustion synthesis and properties of highly phase-pure perovskite electrolyte Co-doped La0. 9Sr0. 1Ga0. 8Mg0. 2O2. 85 for IT-SOFCs. International Journal of Hydrogen Energy, 2010. 35 (1): pp.294-300.

DOI: 10.1016/j.ijhydene.2009.10.087

[7] M. Zhou, et al., Effect of transition metal oxides doping on Ce0. 9Sm0. 05Nd0. 05O1. 95 solid electrolyte materials. Journal of Advanced Ceramics, 2012. 1 (2): pp.150-156.

[8] B. Zhu, X. Liu, and P. Zhou, Cost-effective yttrium doped ceria-based composite ceramic materials for intermediate temperature solid oxide fuel cell applications. Journal of Materials Science Letters, (2001).

[9] C. Liu, et al., Synthesis and characterization of Zr0. 85Y0. 15O1. 925-La9. 33Si6O26 composite electrolyte for application in SOFCs. Journal of Advanced Ceramics, 2013. 1 (4): pp.327-335.

[10] W.S. JANG, and S.H. Hyun, Preparation of YSZ YDC and YSZ GDC composite electrolytes by the tape casting and sol-gel dip-drawing coating method for low-temperature SOFC. Journal of Materials Science, (2002).

[11] D. Setsoafia, et al., Sol-gel synthesis and characterization of Zn2+ and Mg2+ doped La10Si6027 electrolytes for solid oxide fuel cells. SUBMITTED ARTICLE, (2015).