High Temperature NOx Sensor Based on Stabilized Zirconia and ZnFe2O4 Electrode

Zhuiykov, Serge; Muta, M.; Ono, Takashi; Kunimoto, Akira; Yamazoe, Noboru; Miura, Norio

doi:10.1007/978-3-642-59497-7_402

Cited by 4 publications

(5 citation statements)

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“…Unfortunately, the response and recovery time for the ZnFe 2 O 4 -SE were not very fast, compared with the devices using other spinel-type SE. 6,13 The 90% response time to NO and NO 2 200 ppm each in air, were about 10 and about 9 min, respectively, at 700°C.…”

Section: Resultsmentioning

confidence: 99%

Stabilized Zirconia-Based NO[sub x] Sensor Using ZnFe[sub 2]O[sub 4] Sensing Electrode

Zhuiykov

Muta

Ono³

et al. 2001

Electrochem. Solid-State Lett.

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A tubular sensor using yttria-stabilized zirconia ͑YSZ͒ and a spinel-type oxide sensing-electrode ͑SE͒ was fabricated and examined for NO x detection at high temperatures. Among spinel-type oxides tested and reported in the literature to date, ZnFe 2 O 4 has the highest sensitivity to NO 2 in air at temperatures of 550-700°C. In this temperature range, the electromotive force ͑emf͒ response of the sensor was almost linear to the logarithm of NO or NO 2 concentration in the range from 25 to 436 ppm. Scanning electron microscopy and X-ray diffraction analysis were used to examine the morphology and crystalline structure of the ZnFe 2 O 4 film. Investigation of the sensor stability showed that the output emf to 100 ppm NO 2 have been gradually increased within ϳ20% range after ϳ20 day operation up to 200 days examined at 700°C in dry synthetic air. The air base has been stable during the whole test period.The nitrogen oxides, NO and NO 2 , abbreviated as NO x , emitted from automobile engines and boilers are a major source of atmospheric pollution. To solve effectively the NO x problems related to car exhausts, it is necessary to develop a compact solid-state NO x sensor capable of working at high temperatures. If a highperformance NO x sensor is installed in the vehicle, it can be used for an on-board diagnosis of a de-NO x catalyst. By detecting the NO x concentration after the NO x storage catalyst, it will be possible to optimize the timing of regeneration of the catalyst by the flow of fuel-rich gas.Many solid electrolyte potentiometric 1-6 and amperometric 7-11 NO x sensors based on the yttria-stabilized zirconia ͑YSZ͒ and metal oxide sensing electrode ͑SE͒ have been developed and reported to date. Some sensors using an oxide SE, such as CdMn 2 O 4 1 and CdCr 2 O 4 , 4 are based on a sensing mechanism involving mixed potential and can detect NO or NO 2 in oxygen containing atmospheres at 550-650°C. Unfortunately, the sensitivity of these sensors to NO x is still low at temperatures above 600°C. This suggests the importance of further search of SE materials. The geometry and morphology of electrode materials will influence the mixed potential response. The mass production of reproducible electrode structures as well as the long-term stability of the electrodes at elevated temperatures should be established for commercialization of the sensors. The substitution of refractory oxide electrodes for metal electrodes offers promise in improving the selectivity and the long-term stability of these sensors. The selection of metal oxide SE, therefore, is vital to obtain excellent sensing performance. Ongoing research is concentrated mainly on obtaining incremental improvements in the sensing properties of these oxides. Any increases in the sensitivity and selectivity to NO 2 or ͑NO͒ at high temperature are important in terms of enhancing the performance of NO x sensors. Moreover, any increase in the stability of the NO x sensor by manufacturing technology or by careful selection of the SE materials has a considerable ef...

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Section: Resultsmentioning

confidence: 99%

Stabilized Zirconia-Based NO[sub x] Sensor Using ZnFe[sub 2]O[sub 4] Sensing Electrode

Zhuiykov

Muta

Ono³

et al. 2001

Electrochem. Solid-State Lett.

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“…Several papers [14][15][16][17][18] dealing with oxides as a sensing electrode of mixed-potential-type NOx sensor have also been published by several research groups after our first report in 1996. Specifically, we investigated the zinc-family oxides as SEs for NO~ sensors [8][9][10]. Consequently, we have found that, among the single-type oxides examined, the ZnO-SE is most stable and gives the highest sensitivity to NOx at temperature as high as 700 ~ Therefore, in this study the main sensing properties of the YSZ-based mixed-potential NOx sensor using ZnO-SE have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…[6], NiCr204 [7], ZnFe204 [8] and ZnCr204 [9,10], since our first report in 1996 [3] suggested that the use of oxide SE in this type of NOx sensor is very effective for sensitive detection of NO2 at high temperatures. Several papers [14][15][16][17][18] dealing with oxides as a sensing electrode of mixed-potential-type NOx sensor have also been published by several research groups after our first report in 1996.…”

Section: Introductionmentioning

confidence: 99%

Mixed-potential-type NOx sensor based on YSZ and zinc oxide sensing electrode

Miura

Akisada

Wang

et al. 2004

Ionics

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Abstract. Electrochemical sensors using tubular yttria-stabilized zirconia (YSZ) and oxide sensing electrode (SE) were fabricated and examined for NOx detection at high temperatures. The mixed-potential-type NOx sensor using ZnO-SE gave the highest sensitivity to NOx among other single-type oxides tested as SEs in the temperature range of 600-700 ~ The response of the ZnOattached device was a linear for the logarithm of NO2 (NO) concentrations from 40 to 450 ppm. The sensing mechanism of the sensor was discussed on the basis of the gas adsorption-desorption behavior, the catalytic activity data, and electrochemical behavior for oxides examined.

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“…In order to solve the NO x (NO 2 and NO) related pollution problem, it is necessary to develop compact sensors capable of monitoring NO x in the combustion exhausts and in atmospheric environments. Many solid-state potentiometric and amperometric NO x sensors based on the yttria-stabilized zirconia (YSZ) and metal-oxide sensing-electrode (SE) have been developed and reported to date [1][2][3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

NOx-Sensing Characteristics of Sensor with La0.75Sr0.25Cr0.5Mn0.5O3 Sensing Electrode

Zhao

2013

AMM

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Electrochemical sensors based on tubular yttria-stabilized zerconia (YSZ) with the perovskite-type oxide as a sensing-electrode (SE), which is prepared by sol-gel method, were fabricated and examined for NO2 detection in the temperature range 400~700°C. The results show that La0.75Sr0.25Cr0.5Mn0.5O3(LSCM), shows extreme sensitivity to NO2. The EMF varies linearly as a function of the concentration of NO2 (0 ~ 463 ppm) at 500 °C.

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High Temperature NOx Sensor Based on Stabilized Zirconia and ZnFe2O4 Electrode

Cited by 4 publications

References 4 publications

Stabilized Zirconia-Based NO[sub x] Sensor Using ZnFe[sub 2]O[sub 4] Sensing Electrode

Stabilized Zirconia-Based NO[sub x] Sensor Using ZnFe[sub 2]O[sub 4] Sensing Electrode

Mixed-potential-type NOx sensor based on YSZ and zinc oxide sensing electrode

NO<sub>x</sub>-Sensing Characteristics of Sensor with La<sub>0.75</sub>Sr<sub>0.25</sub>Cr<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3</sub> Sensing Electrode

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