Preparation and characterization of solid electrolytes for solid oxide fuel cells. Quarterly report, July 1--September 30, 1996

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During this quarter, the authors have analyzed EXAFS spectra of rare earth doped ceria and identified Gd and Sm doped ceria electrolytes for further investigations in this project. Although electrical properties of the material have been examined in detail, very little work has considered the microstructural/property relationships, particularly in relationship to atomic and geometric structures of these ceria based oxides. The authors have observed an ionic conductivity of 8.3 {times} 10{sup {minus}2} S/Cm in the (CeO{sub 2}){sub 0.8}(GdO{sub 1.5}){sub 0.2} at 800 C which is approximately four times that of Y{sub 2}O{sub 3} doped ZrO{sub 3} doped ZrO{sub 2} at ... continued below

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2 p.

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Creator: Unknown. December 31, 1996.

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Description

During this quarter, the authors have analyzed EXAFS spectra of rare earth doped ceria and identified Gd and Sm doped ceria electrolytes for further investigations in this project. Although electrical properties of the material have been examined in detail, very little work has considered the microstructural/property relationships, particularly in relationship to atomic and geometric structures of these ceria based oxides. The authors have observed an ionic conductivity of 8.3 {times} 10{sup {minus}2} S/Cm in the (CeO{sub 2}){sub 0.8}(GdO{sub 1.5}){sub 0.2} at 800 C which is approximately four times that of Y{sub 2}O{sub 3} doped ZrO{sub 3} doped ZrO{sub 2} at the same temperature. The fraction of Ce{sup +4} ions reduced to Ce{sup +3} as a function of temperature and oxygen partial pressure. The partial reduction of cerium oxide generates mobile electrons and causes electronic conductivity in the electrolyte at temperatures above 500 C. In this quarter, the authors have attempted to measure the microstructural properties using SEM, TEM and HVC STM techniques. Other parts of this investigation are also discussed.

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2 p.

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OSTI as DE98004022

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  • Other Information: PBD: [1996]

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  • Other: DE98004022
  • Report No.: DOE/MT/95016--T3
  • Grant Number: FG22-95MT95016
  • DOI: 10.2172/584870 | External Link
  • Office of Scientific & Technical Information Report Number: 584870
  • Archival Resource Key: ark:/67531/metadc698392

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  • December 31, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 11, 2015, 12:35 p.m.

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Preparation and characterization of solid electrolytes for solid oxide fuel cells. Quarterly report, July 1--September 30, 1996, report, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc698392/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.