Impedance Characterization of a Model Au/Yttria-Stabilized Zirconia (YSZ)/Au Electrochemical Cell in Varying Oxygen and NOx Concentrations

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An electrochemical cell (Au/YSZ/Au) serves as a model system to investigate the effect of O{sub 2} and NO{sub x}. Possible mechanisms responsible for the response are presented. Two dense Au electrodes are co-located on the same side of a dense YSZ electrolyte and are separated from the electrolyte by a porous YSZ layer, present only under the electrodes. While not completely understood, the porous layer appears to result in enhanced NO{sub x} response. Impedance data were obtained over a range of frequencies (0.1 Hz to 1 MHz), temperatures (600 to 700 C), and oxygen (2 to 18.9%) and NO{sub x} ... continued below

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Woo, L Y; Martin, L P; Glass, R S & Gorte, R J November 1, 2006.

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An electrochemical cell (Au/YSZ/Au) serves as a model system to investigate the effect of O{sub 2} and NO{sub x}. Possible mechanisms responsible for the response are presented. Two dense Au electrodes are co-located on the same side of a dense YSZ electrolyte and are separated from the electrolyte by a porous YSZ layer, present only under the electrodes. While not completely understood, the porous layer appears to result in enhanced NO{sub x} response. Impedance data were obtained over a range of frequencies (0.1 Hz to 1 MHz), temperatures (600 to 700 C), and oxygen (2 to 18.9%) and NO{sub x} (10 to 100 ppm) concentrations. Spectra were fit with an equivalent circuit, and values of the circuit elements were evaluated. In the absence of NO{sub x}, the effect of O{sub 2} on the low-frequency arc resistance could be described by a power law, and the temperature dependence by a single apparent activation energy at all O{sub 2} concentrations. When both O{sub 2} and NO{sub x} were present, however, the power-law exponent varied as a function of both temperature and concentration, and the apparent activation energy also showed dual dependence. Adsorption mechanisms are discussed as possibilities for the rate-limiting steps. Implications for impedance metric NO{sub x} sensing are also discussed.

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PDF-file: 43 pages; size: 1.1 Mbytes

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  • Journal Name: Journal of the Electrochemical Society, vol. 154, no. 4, February 15, 2007, J129-J135; Journal Volume: 154; Journal Issue: 4

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  • Report No.: UCRL-JRNL-225792
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 902339
  • Archival Resource Key: ark:/67531/metadc880075

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

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  • November 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 2:24 p.m.

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Woo, L Y; Martin, L P; Glass, R S & Gorte, R J. Impedance Characterization of a Model Au/Yttria-Stabilized Zirconia (YSZ)/Au Electrochemical Cell in Varying Oxygen and NOx Concentrations, article, November 1, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880075/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.