skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: ZIRCONIA-BASED MIXED POTENTIAL CARBON MONOXIDE/HYDROCARBON SENSORS WITH LANTHANUM MAGNESIUM OXIDE, AND TERBIUM-DOPED YTTRIUM STABILIZED ZIRCONIA ELECTRODES

Abstract

We have investigated the performance of dual metal oxide electrode mixed potential sensors in an engine-out, dynamometer environment. Sensors were fabricated by sputtering thin films of LaMnO{sub 3} and Tb-doped YSZ onto YSZ electrolyte. Au gauze held onto the metal oxide thin films with Au ink was used for current collection. The exhaust gas from a 4.8L, V8 engine operated in open loop, steady-state mode around stoichiometry at 1500 RPM and 50 Nm. The sensor showed a stable EMF response (with no hysteresis) to varying concentrations of total exhaust gas HC content. The sensor response was measured at 620 and 670 C and shows temperature behavior characteristic of mixed potential-type sensors. The results of these engine-dynamometer tests are encouraging; however, the limitations associated with Au current collection present the biggest impediment to automotive use.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
765632
Report Number(s):
LA-UR-00-5040
TRN: US200311%%278
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Oct 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON; DYNAMOMETERS; ELECTRODES; ENGINES; HYSTERESIS; LANTHANUM; MAGNESIUM OXIDES; OXIDES; PERFORMANCE; SPUTTERING; STOICHIOMETRY; THIN FILMS; YTTRIUM

Citation Formats

E. L. BROSHA, R. MUKUNDAN, and ET AL. ZIRCONIA-BASED MIXED POTENTIAL CARBON MONOXIDE/HYDROCARBON SENSORS WITH LANTHANUM MAGNESIUM OXIDE, AND TERBIUM-DOPED YTTRIUM STABILIZED ZIRCONIA ELECTRODES. United States: N. p., 2000. Web.
E. L. BROSHA, R. MUKUNDAN, & ET AL. ZIRCONIA-BASED MIXED POTENTIAL CARBON MONOXIDE/HYDROCARBON SENSORS WITH LANTHANUM MAGNESIUM OXIDE, AND TERBIUM-DOPED YTTRIUM STABILIZED ZIRCONIA ELECTRODES. United States.
E. L. BROSHA, R. MUKUNDAN, and ET AL. Sun . "ZIRCONIA-BASED MIXED POTENTIAL CARBON MONOXIDE/HYDROCARBON SENSORS WITH LANTHANUM MAGNESIUM OXIDE, AND TERBIUM-DOPED YTTRIUM STABILIZED ZIRCONIA ELECTRODES". United States. doi:. https://www.osti.gov/servlets/purl/765632.
@article{osti_765632,
title = {ZIRCONIA-BASED MIXED POTENTIAL CARBON MONOXIDE/HYDROCARBON SENSORS WITH LANTHANUM MAGNESIUM OXIDE, AND TERBIUM-DOPED YTTRIUM STABILIZED ZIRCONIA ELECTRODES},
author = {E. L. BROSHA and R. MUKUNDAN and ET AL},
abstractNote = {We have investigated the performance of dual metal oxide electrode mixed potential sensors in an engine-out, dynamometer environment. Sensors were fabricated by sputtering thin films of LaMnO{sub 3} and Tb-doped YSZ onto YSZ electrolyte. Au gauze held onto the metal oxide thin films with Au ink was used for current collection. The exhaust gas from a 4.8L, V8 engine operated in open loop, steady-state mode around stoichiometry at 1500 RPM and 50 Nm. The sensor showed a stable EMF response (with no hysteresis) to varying concentrations of total exhaust gas HC content. The sensor response was measured at 620 and 670 C and shows temperature behavior characteristic of mixed potential-type sensors. The results of these engine-dynamometer tests are encouraging; however, the limitations associated with Au current collection present the biggest impediment to automotive use.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2000},
month = {Sun Oct 01 00:00:00 EDT 2000}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • A high-performance solid-state compact gas sensor to detect CO has been needed for monitoring and controlling the combustion condition of gas appliances. By using a pair of oxide electrodes, a stabilized-zirconia-based sensor was developed for selective detection of CO at high temperature. Among the oxide pair examined, the combination of CdO and SnO{sub 2} was best suited for the electrode couple, giving quick and selective response to CO in air at 600 C. The 90% response and the 90% recovery times of the sensor to 200 ppm CO was as short as ca. 8 and 10 s, respectively, at 600more » C. The EMF value was linearly related with the logarithm of CO concentration in the range of 20 to 4,000 ppm. Moreover, the cross-sensitivities to other gases, such as H{sub 2}, NO, NO{sub 2}, CO{sub 2}, O{sub 2}, and H{sub 2}O, were small or insignificant.« less
  • A new solid-state NO{sub x} sensor operative at high temperature was designed using stabilized zirconia and an oxide sensing electrode. Among the various oxides examined, CdMn{sub 2}O{sub 4} was found to be the most excellent material for NO{sub x} sensing at 500 C. The EMF values of the sensor were almost linear to the logarithm of NO{sub x} concentration with a positive slope for NO{sub 2} and a negative slope for NO. A nitrogen oxide sensing mechanism involving mixed potential was proposed based on the measurements of polarization curves.
  • YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] (YBCO) was evaluated as a potential electrode material for yttria stabilized zirconia (YSZ) based electrochemical devices, due to its high electronic conductivity and capability for oxide ion transport. YBCO electrodes were deposited by screen-printing, which requires moderately high firing temperatures to assure a good bonding and mechanical stability of the deposited layers. Unfortunately, chemical reactivity towards the YSZ electrolyte may significantly decrease electrode performance. In addition, electrochemical decomposition of YBa[sub 2]Cu[sub 3]O[sub 7[minus]x] was observed at fairly low current densities ([approx]20 mA/cm[sup 2]). Overpotentials increased as electrode firing temperature increased from 920 to 940 C duemore » to electrode densification. At 960 C, the onset of chemical degradation was observed but overpotential losses were lowest for these firing conditions. Microstructural examination indicated that partial degradation during sintering had allowed a more porous microstructure to develop at 960 C.« less