ANODE, CATHODE AND THIN FILM STUDIES FOR LOW TEMPERATURE SOFC'S

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In this research the microstructure {leftrightarrow} property relations in solid oxide fuel cells (SOFC's) are being studied to better understand the mechanisms involved in cell performance. The overall aim is to fabricate SOFC's with controlled, stable, high performance microstructure. Most cathode studies were completed in the last DOE contract; studies during this year focused more on the influence of nonstoichiometry on the electrical performance. Studies indicate that nonstoichiometric La{sub x}Sr{sub 0.20}MnO{sub 3}(x = 0.70, 0.75, and 0.79) cathode compositions exhibit the best properties. A series of studies using these compositions fired on at temperatures of 1100, 1200, 1300 and 1400 ... continued below

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17 p.

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Huebner, Dr. Wayne & Anderson, Dr. Harlan U. November 1, 1999.

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Description

In this research the microstructure {leftrightarrow} property relations in solid oxide fuel cells (SOFC's) are being studied to better understand the mechanisms involved in cell performance. The overall aim is to fabricate SOFC's with controlled, stable, high performance microstructure. Most cathode studies were completed in the last DOE contract; studies during this year focused more on the influence of nonstoichiometry on the electrical performance. Studies indicate that nonstoichiometric La{sub x}Sr{sub 0.20}MnO{sub 3}(x = 0.70, 0.75, and 0.79) cathode compositions exhibit the best properties. A series of studies using these compositions fired on at temperatures of 1100, 1200, 1300 and 1400 C were performed. In all instances, 1200 C was the optimum, with the x = 0.70 composition being the best. It has an overpotential of only 0.04V at 1 A/cm{sup 2}. SEM analyses indicated no second phases or interdiffusion is detectable. Studies on optimization of anode compositions yielded the optimum volume fraction of Ni (45vol%), the best sintering temperature/time (1400 C/2 h), and the best starting materials (glycine-nitrate derived NiO and normal YSZ). In essence these results simply reflect the optimum microstructure. As such, they are being used to guide the development of optimized anodes for lower temperature operation based on Cu/CeO{sub 2} cermets. Marked success has been achieved on the placement of thin YSZ electrolytes on porous Ni/YSZ electrodes. The process being used is a transfer technique in which dense YSZ films are initially fabricated on NaCl or polymeric substrates, followed by partial dissolution of the substrate and placement of the film on the porous substrate. This technique has allowed us to produce structures with film thicknesses ranging from 70 to 3000 nm, and grain sizes ranging from 2 to 300 nm. Cells based on electrolytes this thick should operate in the 400--700 C range.

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17 p.

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OSTI as DE00772380

Medium: P; Size: 17 pages

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  • Other Information: PBD: 1 Nov 1999

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  • Report No.: DE--FG26-98FT40487--01
  • Grant Number: FG26-98FT40487
  • DOI: 10.2172/772380 | External Link
  • Office of Scientific & Technical Information Report Number: 772380
  • Archival Resource Key: ark:/67531/metadc718211

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  • November 1, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 7, 2017, 3:32 p.m.

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Huebner, Dr. Wayne & Anderson, Dr. Harlan U. ANODE, CATHODE AND THIN FILM STUDIES FOR LOW TEMPERATURE SOFC'S, report, November 1, 1999; Morgantown, West Virginia. (digital.library.unt.edu/ark:/67531/metadc718211/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.