Effect of electrode material and design on sensitivity and selectivity for high temperature impedancemetric NOx sensors Metadata

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Title

  • Main Title Effect of electrode material and design on sensitivity and selectivity for high temperature impedancemetric NOx sensors

Creator

  • Author: Woo, L Y
    Creator Type: Personal
  • Author: Glass, R S
    Creator Type: Personal
  • Author: Novak, R F
    Creator Type: Personal
  • Author: Visser, J H
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: Livermore, California
    Additional Info: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Date

  • Creation: 2009-09-23

Language

  • English

Description

  • Content Description: Solid-state electrochemical sensors using two different sensing electrode compositions, gold and strontium-doped lanthanum manganite (LSM), were evaluated for gas phase sensing of NO{sub x} (NO and NO{sub 2}) using an impedance-metric technique. An asymmetric cell design utilizing porous YSZ electrolyte exposed both electrodes to the test gas (i.e., no reference gas). Sensitivity to less than 5 ppm NO and response/recovery times (10-90%) less than 10 s were demonstrated. Using an LSM sensing electrode, virtual identical sensitivity towards NO and NO{sub 2} was obtained, indicating that the equilibrium gas concentration was measured by the sensing electrode. In contrast, for cells employing a gold sensing electrode the NO{sub x} sensitivity varied depending on the cell design: increasing the amount of porous YSZ electrolyte on the sensor surface produced higher NO{sub 2} sensitivity compared to NO. In order to achieve comparable sensitivity for both NO and NO{sub 2}, the cell with the LSM sensing electrode required operation at a lower temperature (575 C) than the cell with the gold sensing electrode (650 C). The role of surface reactions are proposed to explain the differences in NO and NO{sub 2} selectivity using the two different electrode materials.
  • Physical Description: PDF-file: 38 pages; size: 0.8 Mbytes

Subject

  • Keyword: Lanthanum
  • Keyword: Gold
  • STI Subject Categories: 36 Materials Science
  • Keyword: Sensitivity
  • Keyword: Electrolytes
  • Keyword: Design
  • Keyword: Electrodes

Source

  • Journal Name: Journal of The Electrochemical Society, vol. 157, no. 3, January 22, 2010, J81-87; Journal Volume: 157; Journal Issue: 3

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: LLNL-JRNL-417117
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 971789
  • Archival Resource Key: ark:/67531/metadc934562