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Title: Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

Abstract

An electrochemical cell employing a YSZ electrolyte and two Au electrodes was utilized as a model system for investigating the mechanisms responsible for impedance metric NO{sub x} (NO and NO{sub 2}) sensing. The cell consists of two dense Au electrodes on top of a porous/dense YSZ bilayer structure (with the additional porous layer present only under the Au electrodes). Both electrodes were co-located on the same side of the cell, resulting in an in-plane geometry for the current path. The porous YSZ appears to extend the triple phase boundary and allows for enhanced NO{sub x} sensing performance, although the exact role of the porous layer is not completely understood. Impedance data were obtained over the frequency range of 0.1 Hz to 1 MHz, and over a range of oxygen (2 to 18.9%) and NO{sub x} (10 to 100 ppm) concentrations, and temperatures (600 to 700 C). Data were fit with an equivalent circuit, and the values of the circuit elements were obtained for different concentrations and temperatures. Changes in a single low-frequency arc were found to correlate with concentration changes, and to be temperature dependent. In the absence of NO{sub x}, the effect of O{sub 2} on the low-frequency resistancemore » could be described by a power law, and the temperature dependence described 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.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
900174
Report Number(s):
UCRL-PROC-226274
Journal ID: ISSN 1946-4274; TRN: US200709%%423
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 972; Conference: Presented at: 2006 MRS Fall Meeting, Boston, MA, United States, Nov 26 - Dec 01, 2006
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; ADSORPTION; ELECTROCHEMICAL CELLS; ELECTRODES; ELECTROLYTES; EQUIVALENT CIRCUITS; FREQUENCY RANGE; GEOMETRY; IMPEDANCE; METRICS; OXYGEN; PERFORMANCE; TEMPERATURE DEPENDENCE

Citation Formats

Woo, L Y, Martin, L P, Glass, R S, and Gorte, R J. Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell. United States: N. p., 2006. Web. doi:10.1557/PROC-0972-AA12-02.
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Woo, L Y, Martin, L P, Glass, R S, & Gorte, R J. Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell. United States. https://doi.org/10.1557/PROC-0972-AA12-02
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Woo, L Y, Martin, L P, Glass, R S, and Gorte, R J. 2006. "Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell". United States. https://doi.org/10.1557/PROC-0972-AA12-02. https://www.osti.gov/servlets/purl/900174.
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@article{osti_900174,
title = {Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell},
author = {Woo, L Y and Martin, L P and Glass, R S and Gorte, R J},
abstractNote = {An electrochemical cell employing a YSZ electrolyte and two Au electrodes was utilized as a model system for investigating the mechanisms responsible for impedance metric NO{sub x} (NO and NO{sub 2}) sensing. The cell consists of two dense Au electrodes on top of a porous/dense YSZ bilayer structure (with the additional porous layer present only under the Au electrodes). Both electrodes were co-located on the same side of the cell, resulting in an in-plane geometry for the current path. The porous YSZ appears to extend the triple phase boundary and allows for enhanced NO{sub x} sensing performance, although the exact role of the porous layer is not completely understood. Impedance data were obtained over the frequency range of 0.1 Hz to 1 MHz, and over a range of oxygen (2 to 18.9%) and NO{sub x} (10 to 100 ppm) concentrations, and temperatures (600 to 700 C). Data were fit with an equivalent circuit, and the values of the circuit elements were obtained for different concentrations and temperatures. Changes in a single low-frequency arc were found to correlate with concentration changes, and to be temperature dependent. In the absence of NO{sub x}, the effect of O{sub 2} on the low-frequency resistance could be described by a power law, and the temperature dependence described 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.},
doi = {10.1557/PROC-0972-AA12-02},
url = {https://www.osti.gov/biblio/900174}, journal = {},
issn = {1946-4274},
number = ,
volume = 972,
place = {United States},
year = {Mon Nov 20 00:00:00 EST 2006},
month = {Mon Nov 20 00:00:00 EST 2006}
}
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Conference:
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https://doi.org/10.1557/PROC-0972-AA12-02
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Works referenced in this record:

Impedance-metric Pt/YSZ/Au–Ga2O3 sensor for CO detection at high temperature
journal, September 2005

Cathodic Polarization Phenomena of Perovskite Oxide Electrodes with Stabilized Zirconia
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Impedancemetric gas sensor based on zirconia solid electrolyte and oxide sensing electrode for detecting total NOx at high temperature
journal, August 2003

High-Temperature Ceramic Gas Sensors: A Review
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Geometrical effects on pseudocapacitance in Pt/YSZ high temperature air cathodes
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A surface-science-based model for the selectivity of platinum–gold alloy electrodes in zirconia-based NOx sensors
journal, November 2003

Critical review of nitrogen monoxide sensors for exhaust gases of lean burn engines
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Catalytic Decomposition of Nitric Oxide on Zirconia by Electrolytic Removal of Oxygen
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The Mechanism of Porous Sm[sub 0.5]Sr[sub 0.5]CoO[sub 3] Cathodes Used in Solid Oxide Fuel Cells
journal, January 2001

Electrochemical Characterization of Thin Films for a Micro-Solid Oxide Fuel Cell
journal, July 2004

The electrode system ‖ZrO2: 8Y2O3 investigated by impedence spectroscopy
journal, August 1991

Electrochemical decomposition of NO over composite electrodes on YSZ electrolyte
journal, January 2006

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