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Sökning: WFRF:(Bin Amjad M)

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  • Thomas, HS, et al. (författare)
  • 2019
  • swepub:Mat__t
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  • Rafique, Asia, et al. (författare)
  • Significance enhancement in the conductivity of core shell nanocomposite electrolytes
  • 2015
  • Ingår i: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 5:105, s. 86322-86329
  • Tidskriftsartikel (refereegranskat)abstract
    • Today, there is great demand of electrolytes with high ionic conductivities at low operating temperatures for solid-oxide fuel cells. Therefore, a co-doped technique was used to synthesize a highly ionically conductive two phase nanocomposite electrolyte Sr/Sm-ceria-carbonate by a co-precipitation method. A significant increase in conductivity was measured in this co-doped Sr/Sm-ceria-carbonate electrolyte at 550 degrees C as compared to the more commonly studied samarium doped ceria. The fuel cell power density was 900 mW cm(-2) at low temperature (400-580 degrees C). The composite electrolyte was found to have homogenous morphology with a core-shell structure using SEM and TEM. The two phase core-shell structure was confirmed using XRD analysis. The crystallite size was found to be 30-60 nm and is in good agreement with the SEM analysis. The thermal analysis was determined with DSC. The enhancement in conductivity is due to two effects; co-doping of Sr in samarium doped ceria and it's composite with carbonate which is responsible for the core-shell structure. This co-doped approach with the second phase gives promise in addressing the challenge to lower the operating temperature of solid oxide fuel cells (SOFC).
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