The electrolyte slurry was prepared by mixing Gd-doped CeO2(GDC), solvent (ethanol and toluene), a polymer (polyvinyl butyral (PVB)) binder, and a dispersant (an amine system). The slurries were processed by an atomization process and coated on the top of microtubular tubes. A very smooth (with no cracks) electrolyte surface was obtained when the PVB polymer content was 8 wt. % (regular solution); however, a unique natural patchwork-type nanoporous grain boundary was obtained when the polymer content was increased to 16 wt. % (excess solution) in the same slurries. The results of this study show that polymers (binders) can be used not only to fabricate a dense electrolyte but also to generate a nanoporous grain boundary. The fabricated electrolytes have been tested for solid oxide fuel cell (SOFC) applications in the intermediate-temperature region. The microtubular cell with dense electrolytes maintained a high performance even under 600 °C.
Effects of Polymer Binder in Electrolyte Slurries and Their Microtubular SOFC Applications
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received December 5, 2012; final manuscript received December 31, 2012; published online March 21, 2013. Editor: Nigel M. Sammes.
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Hasan Zahir, M., and Suzuki, T. (March 21, 2013). "Effects of Polymer Binder in Electrolyte Slurries and Their Microtubular SOFC Applications." ASME. J. Fuel Cell Sci. Technol. April 2013; 10(2): 021006. https://doi.org/10.1115/1.4023541
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