Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects

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This report summarizes the work done during the fifth quarter of the project. Effort was directed in two areas: (1) Further development of the model on the role of connectivity on ionic conductivity of porous bodies, including the role of grain boundaries and space charge region. (2) Fabrication of porous samaria-doped ceria (SDC) and investigation of the effect of thermal treatment on its conductivity. The model developed accounts for transport through three regions: (a) Transport through the bulk of the grain, RI, which includes parallel transport through space charge region. (b) Transport through the space charge region adjacent to the ... continued below

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Virkar, Anil V. March 8, 2004.

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Description

This report summarizes the work done during the fifth quarter of the project. Effort was directed in two areas: (1) Further development of the model on the role of connectivity on ionic conductivity of porous bodies, including the role of grain boundaries and space charge region. (2) Fabrication of porous samaria-doped ceria (SDC) and investigation of the effect of thermal treatment on its conductivity. The model developed accounts for transport through three regions: (a) Transport through the bulk of the grain, RI, which includes parallel transport through space charge region. (b) Transport through the space charge region adjacent to the neck (grain boundary), RII. (c) Transport through the structural part of the neck (grain boundary), RIII. The work on the model development involves calculation RI, RII, RIII, and the sum of these three terms, which is the total resistance, as a function of the grain radius ranging between 0.5 and 5 microns and as a function of the relative neck size, described in terms of the angle theta, ranging between 5 and 45{sup o}. Three values of resistivity of the space charge region were chosen; space charge resistivity greater than grain resistivity, equal to grain resistivity, and lower than grain resistivity. Experimental work was conducted on samaria (Sm{sub 2}O{sub 3})-doped ceria (SDC) samples of differing porosity levels, before and after thermal treatment at 1200 C. The conductivity in the annealed samples was lower, consistent with enhanced Debye length. This shows the important role of space charge on ionic transport, and its implications concerning cathode polarization.

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OSTI as DE00833836

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  • Other Information: PBD: 8 Mar 2004

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  • Report No.: NONE
  • Grant Number: FC26-02NT41602
  • DOI: 10.2172/833836 | External Link
  • Office of Scientific & Technical Information Report Number: 833836
  • Archival Resource Key: ark:/67531/metadc780810

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  • March 8, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Jan. 9, 2018, 1:03 p.m.

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Virkar, Anil V. Active Cathodes for Super-High Power Density Solid Oxide Fuel Cells Through Space Charge Effects, report, March 8, 2004; Utah. (digital.library.unt.edu/ark:/67531/metadc780810/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.