Zirconia-Based Gas Sensors Using Oxide Sensing Electrode for Monitoring Nox in Car Exhaust

Miura, Norio; Wang, J.; Nakatou, Mitsunobu; Elumalai, Palani; Zhuiykov, Serge; Terada, Daisuke; Ono, Takashi

doi:10.1002/9780470291252.ch1

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…Such a new and reliable solid-state NOx sensor will allow direct and precise analysis of the pollutants, easily integrable in the OBD system of direct-injection-type gasoline engines operating in lean region. So far, mixed-potential-type sensors based on YSZ and oxide-SEs are considered to be good candidates in regard to their special features such as compactness, fast response, and low cost [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. However, the sensitivity is considerably low, especially at temperatures in excess of 700°C.…”

Section: Introductionmentioning

confidence: 99%

Dependence of NO2 sensitivity on thickness of oxide-sensing electrodes for mixed-potential-type sensor using stabilized zirconia

Elumalai

Plashnitsa

Ueda

et al. 2007

Ionics

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The effect of thickness of oxide-sensing electrode (SE) on NO 2 sensitivity of the planar sensor based on yttria-stabilized zirconia (YSZ) was examined at high temperatures. The sensitivity of the sensor increased with decreasing thickness of SE, and the highest sensitivity was obtained by using the thinnest layer of Cr 2 O 3 -SE (2.7 μm) at 700°C. In the case of NiO-SE, the highest sensitivity was observed for the sensor using the 4-μm-thick SE even at a high temperature of 850°C. Based on the results of the measurements for the complex impedances, the polarization curves, and the gas-phase NO 2 decomposition catalysis, it was confirmed that the catalytic activity to the gas-phase NO 2 decomposition on the oxide-SE matrix played an important role in determining the NO 2 sensitivity of the present sensors.

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Section: Introductionmentioning

confidence: 99%

Dependence of NO2 sensitivity on thickness of oxide-sensing electrodes for mixed-potential-type sensor using stabilized zirconia

Elumalai

Plashnitsa

Ueda

et al. 2007

Ionics

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“…Therefore, it is vital to have a material of SE which can withstand such high temperatures for a long time. Recently, we found that NiO-SE was capable of working at temperatures up to 900 • C [17,29,55,[58][59][60]. Fig.…”

Section: Development Of No X -Sensing Electrodes In the Early 21st Cementioning

confidence: 99%

Development of zirconia-based potentiometric NOx sensors for automotive and energy industries in the early 21st century: What are the prospects for sensors?

Zhuiykov

Miura

2007

Sensors and Actuators B: Chemical

192

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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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Zirconia-Based Gas Sensors Using Oxide Sensing Electrode for Monitoring Nox in Car Exhaust

Cited by 8 publications

References 17 publications

Dependence of NO2 sensitivity on thickness of oxide-sensing electrodes for mixed-potential-type sensor using stabilized zirconia

Dependence of NO2 sensitivity on thickness of oxide-sensing electrodes for mixed-potential-type sensor using stabilized zirconia

Development of zirconia-based potentiometric NOx sensors for automotive and energy industries in the early 21st century: What are the prospects for sensors?

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

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