NO[sub x] Sensing Characteristics of Mixed-Potential-Type Zirconia Sensor Using NiO Sensing Electrode at High Temperatures

Miura, Norio; Wang, Jian; Nakatou, Mitsunobu; Elumalai, Perumal; Hasei, Masahara

doi:10.1149/1.1843731

Cited by 67 publications

(51 citation statements)

References 19 publications

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“…Oxide ion conductors are used in a variety of gas sensors [1][2][3], solid oxide electrochemical cells (SOECs) [4][5][6], and solid oxide fuel cells (SOFCs) [7,8]. In these applications, SOFCs are being especially developed as a clean and efficient power source for generating electricity from a variety of fuels.…”

Section: Introductionmentioning

confidence: 99%

Influence of microstructure on oxide ionic conductivity in doped CeO2 electrolytes

Mori

Drennan

2006

J Electroceram

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Doped ceria (CeO 2 ) compounds are fluorite type oxides, which show oxide ionic conductivity higher than yttria stabilized zirconia, in oxidizing atmospheres. As a consequence of this, considerable interest has been shown in application of these materials for 'low (500 • -650 • C)' temperature operation of solid oxide fuel cells (SOFCs). In this study, some rare earth (eg. Gd, Sm, and Dy) doped CeO 2 nanopowders were synthesized via a carbonate co-precipitation method. Fluorite-type solid solution were able to be formed at low temperature, such as 400 • C and dense sintered bodies were subsequently fabricated in the temperature ranging from 1000 • to 1450 • C by conventional sintering (CS) method. To develop high quality solid electrolytes, the microstructure at the atomic level of these doped CeO 2 solid electrolytes were examined using transmission electron microscopy (TEM). The specimens obtained by CS had continuous and large micro-domains with a distorted pyrochlore structure or related structure, within each grain. We conclude that the conducting properties in these doped CeO 2 systems are strongly influenced by the micro-domain size in the grain. To minimize the micro-domain size, spark plasma sintering (SPS) was examined. SPS has not been used to fabricate dense sintered bodies of doped CeO 2 electrolytes, previously; carbon from the graphite dies penetrates the specimens and inhibits densification. To overcome this challenge, and to be able to produce dense sintered bodies of doped CeO

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Section: Introductionmentioning

confidence: 99%

Influence of microstructure on oxide ionic conductivity in doped CeO2 electrolytes

Mori

Drennan

2006

J Electroceram

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“…Tungsten oxide has also been used as an electrode for NO x sensors [246,[254][255][256][257][258][259][261][262][263], some examples of which are shown in Figure 13.22 [254-259, 262, 263]. Nickel oxide has also been used as the electrode material for NO x sensors [264][265][266][267][268][269][270][271][272][273][274]. One of the advantages of NiO electrodes is the improved sensor response at high temperatures.…”

Section: Electrocatalytic Electrodesmentioning

confidence: 99%

“…One of the advantages of NiO electrodes is the improved sensor response at high temperatures. Figure 13.23 shows the sensitivities of NO x sensors with WO 3 [254][255][256][257][258][259]262] or NiO [264][265][266][267][268][269] electrodes. As shown above for CO sensors, the responses of sensors with WO 3 electrodes decrease as the temperature is increased above 600 C. The responses of sensors with NiO electrodes, however, remain high up to operating temperatures of 900 C. The response of NiO electrodes can be increased even further with the addition of ruthenium [268].…”

Section: Electrocatalytic Electrodesmentioning

confidence: 99%

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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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“…We have extensively investigated several oxide-SEs, such as CdMn 2 O 4 [2,3], CdCr 2 O 4 [4,5], WO 3 [6,7], NiCr 2 O 4 [8], ZnFe 2 O 4 [9,10], ZnCr 2 O 4 [11], ZnO [12]. For the first time in this sensor field, we have currently reported that NiO can detect NO 2 even at high temperature of 900 • C under wet condition [13,14]. Many papers dealing with mixed-potential-type YSZ-based NOx sensors have been also reported by several research groups [15][16][17][18][19][20][21][22][23][24] after our first report in 1996 [2,3].…”

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confidence: 99%

Electrochemical NOx sensors based on stabilized zirconia: comparison of sensing performances of mixed-potential-type and impedancemetric NOx sensors

et al. 2006

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A tubular sensor was fabricated by using yttira stabilized zirconia (YSZ) and ZnCr 2 O 4 sensing-electrode (SE) aiming for detection of NOx at high temperature. The sensing characteristics of this YSZ-based sensor were evaluated at 700 • C by means of potentiometric (mixed-potential) and impedancemetric methods with the variation of thickness of SE. A correlation between the thickness and the sensing performances was obtained for both types of NOx sensors. The mixed-potential-type sensor using ZnCr 2 O 4 -SE exhibited high NOx sensitivity when the SE thickness was small (4 μm). On the other hand, the impedancemetric sensor, employing the same oxide-SE, provided almost equal sensitivity to NO and NO 2 when the SE thickness was large (39 μm). In this case, the total concentration of NOx can be measured. The comparison of sensing mechanisms for the both sensors was briefly discussed.

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NO[sub x] Sensing Characteristics of Mixed-Potential-Type Zirconia Sensor Using NiO Sensing Electrode at High Temperatures

Cited by 67 publications

References 19 publications

Influence of microstructure on oxide ionic conductivity in doped CeO2 electrolytes

Influence of microstructure on oxide ionic conductivity in doped CeO2 electrolytes

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

Electrochemical NOx sensors based on stabilized zirconia: comparison of sensing performances of mixed-potential-type and impedancemetric NOx sensors

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