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Effect of Alkali Carbonates (Single, Binary, and Ternary) on Doped Ceria: A Composite Electrolyte for Low-Temperature Solid Oxide Fuel Cells
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 1, p. 806-818Article in journal (Refereed) Published
Abstract [en]

Samarium-doped ceria (SDC) carbonate has become an attractive electrolyte for fuel cells because of its remarkable ion conductivity and high performance. Different doped ceria-carbonate (single-carbonate SDC, binary-carbonate SDC, and ternary-carbonate SDC) electrolytes were synthesized by the coprecipitation/oxalate method, to optimize the electrochemical performance. The structure; morphology; and thermal, optical, and surface properties have been studied using a variety of techniques. The X-ray diffraction results confirmed the successful incorporation of samarium into ceria as a crystalline structure and inclusion of carbonate, which is amorphous in nature. To analyze the conduction mechanism, direct current conductivity was measured in a H2/O2 atmosphere. Doped ceria-binary carbonate ((Li/Na)CO3-SDC) showed the best conductivity of 0.31 S cm-1 and power density of 617 mW cm-2, at 600 °C. The enhancement in the ionic conductivity and performance of the composites is due to the contribution of hybrid ions (O2-, H+). The crystallite size of the composites was in the range 21-41 nm. For the calculation of band gaps, optical absorption spectra of the synthesized powders were analyzed, and they showed a red shift with the band gap energy in the range 2.6-3.01 eV, when compared to that of pure ceria (3.20 eV).

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 10, no 1, p. 806-818
Keywords [en]
alkaline carbonate, band gap, crystallite size, electrochemical impedance spectroscopy, red shift
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-221750DOI: 10.1021/acsami.7b17010ISI: 000422814400087Scopus ID: 2-s2.0-85040443191OAI: oai:DiVA.org:kth-221750DiVA, id: diva2:1177082
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QC 20180124

Available from: 2018-01-24 Created: 2018-01-24 Last updated: 2018-02-02Bibliographically approved

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Raza, Rizwan
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