Aging Studies of Sr-doped LaCrO3/YSZ/Pt Cells for an Electrochemical NOx Sensor

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The stability and NO{sub x} sensing performance of electrochemical cells of the structure Sr-doped LaCrO{sub 3-{delta}} (LSC)/yttria-stabilized zirconia (YSZ)/Pt are being investigated for use in NO{sub x} aftertreatment systems in diesel vehicles. Among the requirements for NO{sub x} sensor materials in these systems are stability and long lifetime (up to ten years) in the exhaust environment. In this study, cell aging effects were explored following extended exposure to a test environment of 10% O{sub 2} at operating temperatures of 600-700 C. The data show that aging results in changes in particle morphology, chemical composition and interfacial structure, Impedance spectroscopy indicated ... continued below

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Song, S; Martin, L P; Glass, R S; Murray, E P; Visser, J H; Soltis, R E et al. October 5, 2005.

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The stability and NO{sub x} sensing performance of electrochemical cells of the structure Sr-doped LaCrO{sub 3-{delta}} (LSC)/yttria-stabilized zirconia (YSZ)/Pt are being investigated for use in NO{sub x} aftertreatment systems in diesel vehicles. Among the requirements for NO{sub x} sensor materials in these systems are stability and long lifetime (up to ten years) in the exhaust environment. In this study, cell aging effects were explored following extended exposure to a test environment of 10% O{sub 2} at operating temperatures of 600-700 C. The data show that aging results in changes in particle morphology, chemical composition and interfacial structure, Impedance spectroscopy indicated an initial increase in the cell resistance during the early stages of aging, which is correlated to densification of the Pt electrode. Also, x-ray photoelectron spectroscopy indicated formation of SrZrO{sub 2} solid state reaction product in the LSC, a process which is of finite duration. Subsequently, the overall cell resistance decreases with aging time due, in part, to roughening of YSZ-LSC interface, which improves interface adherence and enhances charge transfer kinetics at the O{sub 2}/YSZ/LSC triple phase boundary. This study constitutes a first step in the development of a basic understanding of aging phenomena in solid state electrochemical systems with application not only to sensors, but also to fuel cells, membranes, and electrolyzers.

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PDF-file: 26 pages; size: 0.2 Mbytes

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  • Journal Name: Journal of the Electrochemical Society, vol. 153, no. 9, June 28, 2006, H171-H180

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  • Report No.: UCRL-JRNL-216021
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 891728
  • Archival Resource Key: ark:/67531/metadc875856

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

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  • October 5, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 6, 2016, 6:55 p.m.

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Song, S; Martin, L P; Glass, R S; Murray, E P; Visser, J H; Soltis, R E et al. Aging Studies of Sr-doped LaCrO3/YSZ/Pt Cells for an Electrochemical NOx Sensor, article, October 5, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875856/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.