Sensing properties and selectivities of a WO3/YSZ/Pt potentiometric NOx sensor

Yoo, Jiho; Chatterjee, Suman; Wachsman, Eric D.

doi:10.1016/j.snb.2006.07.024

Cited by 60 publications

(59 citation statements)

References 23 publications

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“…These sensors should work well in a wide range of operating temperature with fast response/recovery rates for very long-term (example, 10 years). Over the last decade, many mixedpotential-type sensors based on YSZ attached with metal oxide SEs have been extensively examined and reported for NO x detection [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The mixed-potential model predicts a linear dependence of sensitivity on a logarithm of NO x concentration, as reported elsewhere [1, 3, 4, 6-8, 11, 12, 14-18].…”

Section: Introductionmentioning

confidence: 86%

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Plashnitsa

Ueda

Elumalai

et al. 2007

Ionics

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The nanostructured thin NiO films with the thicknesses of 30-180 nm were examined as a sensing electrode (SE) for the planar mixed-potential-type yttriastabilized zirconia (YSZ)-based NO 2 sensor. The sensing characteristics were examined in the temperature range of 600-800°C under the wet condition (5 vol.% water vapor).Among the NiO-SEs tested, the 60 nm-thick NiO-SE sintered at 1,000°C was found to give the highest NO 2 sensitivity in the NO 2 concentration range of 50-400 ppm accompanying with fast response/recovery at the operating temperatures of 600-700°C. The high NO 2 sensitivity was attributed to the high catalytic activity for both electrochemical reactions of O 2 and NO 2 at the interface of NiO-SE/YSZ. The ultrathin gold layer with the thickness of about 60 nm was additionally formed on the 60 nm-thick NiO-SE to fabricate the laminated-type (60 nm NiO/60 nm Au)-SE. It was demonstrated that the use of this laminated (NiO-Au)-SE improved both the sensitivity and the selectivity to NO 2 .

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Section: Introductionmentioning

confidence: 86%

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Plashnitsa

Ueda

Elumalai

et al. 2007

Ionics

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“…Solid-state ceramic sensors have also been used to measure NO x concentrations in engine exhaust [13,14]. The sensor described in this thesis utilizes solid-state ceramic components to detect coke formation.…”

Section: Prior Workmentioning

confidence: 99%

Development of an impedance-based sensor for detection of catalyst coking in fuel reforming systems

Wheeler

2013

Sensors and Actuators B: Chemical

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A novel sensor for detecting the early stages of catalyst coking in fuel reforming systems has been developed. The sensor was manufactured by inkjet printing a colloidal suspension of ceramic powders to create thin (20 µm) catalytic and conductive elements of the sensor.The catalytic elements are composed of a Ni-YSZ cermet. The Ni-YSZ cermet was prepared with a concentration below the percolation limit (20 vol%) of nickel, ensuring a low electrical conductivity. As coke forms on the catalyst material, the nickel nodules in the Ni-YSZ are connected by electrically conductive carbon and the conductivity of the catalyst material increases, indicating coke formation.Sensors were tested in a 1% ethylene environment to induce coking. The sensor showed a strong response to coking by producing a signal on the order of hundreds of millivolts.

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“…Similarly, the calibration curve for a NO x sensor in diesel exhaust is different from that determined in the laboratory [168]. In addition, the presence of a relatively small amount of oxygen (3%) can affect the response of a NO x sensor [340]. The effect of oxygen gas content on the outputs of NO x [341] and CO [23, 303,341] sensors is shown in Figure 13.28.…”

Section: Log [Co] (Ppm)mentioning

confidence: 99%

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

Fergus

2009

Solid State Electrochemistry I

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Solid electrolytes are well suited for use in chemical sensors for high-temperature applications. The first such sensors followed from the use of solid electrolytes for thermodynamic measurements, and are based on galvanic cells, for which the open circuit voltage is related to the concentration of the mobile ionic species, or to another target species through equilibration at the electrode surface. However, sensors can also be based on nonequilibrium, but steady-state, potentials established between electrochemical reactions at the electrode. Another approach is to use the current passing through the electrolyte, rather than the voltage across the electrolyte, as the sensor signal. In this chapter we first describe the different methods for using solid electrolytes in chemical sensors, and then discuss some of the materials challenges and example applications. IntroductionMore than 50 years ago, Kiukkola and Wagner [1] demonstrated that solid electrolytes couldbeusedingalvaniccellstomeasurethethermodynamicpropertiesofoxides.Those pioneering studies subsequently led to the more practical application of solid electrolytes in chemical sensors. The ionic conduction in solid electrolytes is thermally activated and thus its rate increases with increasing temperature; consequently, solid electrolytes are well suited for high-temperature applications. On the other hand, such temperature dependencealsomeansthatsensorsbasedonsolidelectrolytescanrespondsluggishlyor may be inoperable at low temperatures. However, one of the advantages of solid-state devices, such as those based on solid electrolytes, is that they can be miniaturized [2,3]. Decreasingthedevicedimensionsreducesdiffusionlengths,whichinturndecreasesthe response time and thus also the minimum operating temperature.Ionic conducting solids can be used in a variety of different types of sensor [4][5][6][7][8][9][10][11][12]. Solids forwhichthe ionicconductivity is much largerthanthe electronic conductivity can Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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Sensing properties and selectivities of a WO3/YSZ/Pt potentiometric NOx sensor

Cited by 60 publications

References 23 publications

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Zirconia-based planar NO2 sensor using ultrathin NiO or laminated NiO–Au sensing electrode

Development of an impedance-based sensor for detection of catalyst coking in fuel reforming systems

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

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