Thin film fuel cell/battery power generating system. Annual report, April 1, 1978-March 31, 1979

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Work on the modified lanthanum chromite interconnection (IC) proceeded in a number of areas. Toward determining the stability of the IC, oxygen ion transport mechanisms were evaluated, as well as IC stability under low oxygen partial pressures (10/sup -6/t 10/sup -18/ atm). To produce long, continuous, 40 ..mu..m thick IC films on 0.3 m long porous support tubes, improvements were made in both the EVD apparatus and process. Porous support tubes of calcia-stabilized zirconia were produced, up to 0.3 m long, for fuel cell stack fabrication. Work on the air electrode current collector covered several areas. The high-temperature resistivity of ... continued below

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Pages: 181

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Available, Not April 30, 1979.

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Description

Work on the modified lanthanum chromite interconnection (IC) proceeded in a number of areas. Toward determining the stability of the IC, oxygen ion transport mechanisms were evaluated, as well as IC stability under low oxygen partial pressures (10/sup -6/t 10/sup -18/ atm). To produce long, continuous, 40 ..mu..m thick IC films on 0.3 m long porous support tubes, improvements were made in both the EVD apparatus and process. Porous support tubes of calcia-stabilized zirconia were produced, up to 0.3 m long, for fuel cell stack fabrication. Work on the air electrode current collector covered several areas. The high-temperature resistivity of doped indium oxide was studied at various doping levels, as a function of oxygen partial pressure. Also, other possible current collector formulations were investigated. By incorporating materials and process improvements, as well as improved porous support tubes, in the fabrication of 20 cell stacks, stack quality and performance at 400 mA/cm/sup 2/ and 1000/sup 0/C have steadily improved. Measurement techniques have been refined on the fuel cell and its components. Realistic combination specimens, as fuel electrode-interconnection layers on a porous support tube, have been used to determine interconnection apparent resistivity at 1000/sup 0/C. From polarization tests on fabricated fuel cell stacks, major electrical resistance contributors to the total cell resistance are the air electrode and the interconnection, with the latter being the largest contributor.

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Pages: 181

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NTIS, PC A09/MF A01.

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  • Report No.: DOE/ET/11305-T9
  • Grant Number: AC02-76ET11305
  • DOI: 10.2172/6210695 | External Link
  • Office of Scientific & Technical Information Report Number: 6210695
  • Archival Resource Key: ark:/67531/metadc1109565

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • April 30, 1979

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 26, 2018, 12:55 p.m.

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Available, Not. Thin film fuel cell/battery power generating system. Annual report, April 1, 1978-March 31, 1979, report, April 30, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1109565/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.