Planar, impedance-metric NOx-sensor with spinel-type SE for high temperature applications

Stranzenbach, Mathias; Gramckow, Erik; Saruhan, Bilge

doi:10.1016/j.snb.2007.07.056

Cited by 35 publications

(15 citation statements)

References 8 publications

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“…Stranzenbach et al [28] fabricated planar, impedancebased NO x sensors by sputtering sensing electrodes of the spinel NiCr 2 O 4 on both fully stabilized YSZ and partially stabilized zirconia (PSZ) electrolyte. They measured sensitivity by the change in magnitude of the impedance, ΔZ, on the addition of a sample gas.…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

“…They used the same equivalent circuit as in their previous work [28]. The resistor of the Cole element represents the "reactionresistance" for adsorption, dissociation, and electrochemical reactions.…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

“…In the course of an investigation of NO x sensors, Stranzenbach et al [28,30] examined cross-sensitivity to CH 4 . Reducing gases caused both ohmic and capacitive changes in the sensor that they associated with the changes in charge carriers in the electrolyte and not with electrode processes.…”

Section: Hydrocarbonsmentioning

confidence: 99%

“…Stranzenbach et al [28,30] also looked at the crosssensitivity of a NO x sensor to CO in addition to CH 4 . Since both are reducing gases, they drew the same conclusions for CO as they did for CH 4 .…”

Section: Carbon Monoxidementioning

confidence: 99%

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A review of recent progress in sensing of gas concentration by impedance change

Rheaume

Pisano

2011

Ionics

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The intent of this paper is to establish the state of the art of impedance-based gas sensors. This sensor type holds promise for accurate detection of gaseous species at single parts per million and below. Impedance-based sensors do not require reference air to function, but do require calibration. Progress in the development of impedancemetric sensors for the detection of NO x , H 2 O, hydrocarbons, and CO is reviewed. Sensing electrodes typically consist of a noble metal or a metal oxide. YSZ is the preferred electrolyte material. Counter electrodes of Pt were common in asymmetric cells. These sensors typically operate at 500-700°C and are interrogated at 10 Hz or less. Selectivity of these sensors remains a challenge especially in lean environments. Stability is an infrequently discussed yet important concern. Equivalent circuit analysis has shed light on various detection mechanisms. The impedance changes due to analyte gases are exhibited in parameters that represent the low frequency behavior of the electrochemical system. Although the search for a detailed mechanism continues, the change in impedance due to a specific gas is generally attributed to transport processes such as adsorption and charge transfer.

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Section: Nitrogen Oxidesmentioning

confidence: 99%

Section: Nitrogen Oxidesmentioning

confidence: 99%

Section: Hydrocarbonsmentioning

confidence: 99%

Section: Carbon Monoxidementioning

confidence: 99%

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A review of recent progress in sensing of gas concentration by impedance change

Rheaume

Pisano

2011

Ionics

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“…For example, LaFeO 3 [374], Cr 2 O 3 [375], ZnCr 2 O 4 [245,320,328,376,377] and NiCr 2 O 4 [272,378] have been used in both potentiometric and impedancemetric NO x sensors, although the performance of each electrode material differs between the two types of sensor. For example, ZnCr 2 O 4 does not perform particularly well in the potentiometric mode, but is one of the best electrodes in the impedancemetric mode.…”

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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Single Bimodular Sensor for Differentiated Detection of Multiple Oxidative Gases

Zhang

Sun

Gao

2020

Adv Materials Technologies

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Semiconductive metal-oxide sensors suffer from cross-sensitivities under mixed chemical condition, specifically upon mixture of multiple oxidative or reducive gases. Herein, a single bimodular sensor has been demonstrated for smart differentation of multiple oxidative analytes by relating the resistance-metric mode to impedance-metric mode. The sensor construct based on ZnO nanorods readily outputs three response datasets upon exposure of oxidative-gas mixture including O 2 , SO 2 , and NO 2 , the resistance, real part impedance, and imaginary part impedance. The differentiative and correlated nature between these response signals allows such a single sensor platform to differentiate these oxidative gases accurately and robustly. Linear and non-linear decision boundaries were established over a large gas-concentration range from 2 ppm to 3 % through a combination of principal component analysis and artificial neural network training. A facile user interface was demonstrated for recognition and measurement of unknown gas analytes, with the error of the predicted analyteconcentration as low as 2 %.

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Planar, impedance-metric NOx-sensor with spinel-type SE for high temperature applications

Cited by 35 publications

References 8 publications

A review of recent progress in sensing of gas concentration by impedance change

A review of recent progress in sensing of gas concentration by impedance change

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

Single Bimodular Sensor for Differentiated Detection of Multiple Oxidative Gases

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