Impedancemetric gas sensor based on zirconia solid electrolyte and oxide sensing electrode for detecting total NO  at high temperature

Miura, Norio; Nakatou, Mitsunobu; Zhuiykov, Serge

doi:10.1016/s0925-4005(03)00196-5

Cited by 182 publications

(119 citation statements)

References 19 publications

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“…The response to NO 2 was qualitatively similar to that for NO. Miura, et al, and Wu, et al, have seen qualitatively similar response and utilized |Z| as the sensing signal at 1 Hz and 0.42 Hz, respectively [6,7]. Figure 2 shows that θ may also be suitable for sensing.…”

Section: Discussionmentioning

confidence: 76%

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

et al. 2006

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An electrochemical cell employing a YSZ electrolyte and two Au electrodes was utilized as a model system for investigating the mechanisms responsible for impedancemetric NO x (NO and NO 2 ) sensing. The cell consists of two dense Au electrodes on top of a porous/dense YSZ bilayer structure (with the additional porous layer present only under the Au electrodes). Both electrodes were co-located on the same side of the cell, resulting in an in-plane geometry for the current path. The porous YSZ appears to extend the triple phase boundary and allows for enhanced NO x sensing performance, although the exact role of the porous layer is not completely understood. Impedance data were obtained over the frequency range of 0.1 Hz to 1 MHz, and over a range of oxygen (2 to 18.9%) and NO x (10 to 100 ppm) concentrations, and temperatures (600 to 700• C). Data were fit with an equivalent circuit, and the values of the circuit elements were obtained for different concentrations and temperatures. Changes in a single low-frequency arc were found to correlate with concentration changes, and to be temperature dependent. In the absence of NO x , the effect of O 2 on the low-frequency resistance could be described by a power law, and the temperature dependence described by a single apparent activation energy at all O 2 concentrations. When both O 2 and NO x were present, however, the power law exponent varied as a function of both temperature and concentration, and the apparent activation energy also showed dual dependence. Adsorption mechanisms are discussed as possibilities for the rate-limiting steps. INTRODUCTIONNO x sensor development is motivated by environmental concerns and poses numerous challenges including cost, sensitivity, stability, and response time. Yttria-stabilized zirconia (YSZ) is currently used for automotive O 2 sensors and is particularly suited to meet the harsh, high-temperature operation requirements. Development of YSZ-based NO x sensors has focused on amperometric and potentiometric types, usually relying on various metal-oxide electrodes to optimize the response [1-3]. Two major drawbacks have been device stability and the need for complicated structures to account for interfering gases, such as O 2 . This paper presents an impedancemetric type YSZ-based model system, which has the possibility of overcoming problems associated with other types of sensors [4]. Previous work reported an impedancemetric NO x sensor using Au, porous YSZ/Cr 2 O 3 composite electrodes, and a YSZ electrolyte in an in-plane geometry [4]. Understanding the sensing mechanisms is necessary to optimize sensor operation. The present work uses a model electrochemical cell to isolate the role of the Au/porous YSZ interface. The cell consists of a dense YSZ electrolyte and two planar Au plates, with a porous YSZ layer separating the Au and dense YSZ. Impedance spectroscopy measurements were performed and then fit with an equivalent circuit. Data taken at different temperatures (600, 650, and 700• C) and concentrations are used t...

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Section: Discussionmentioning

confidence: 76%

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

et al. 2006

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“…By "NO x ", one specifically refers to nitric oxide (NO) and nitrogen dioxide (NO 2 ), the two gaseous species that constitute virtually all NO x emissions from anthropogenic combustion processes [17]. For impedance-type NO x sensors, the response to NO and NO 2 has been demonstrated to be comparable in magnitude and of the same sign (in contrast to mixed potential sensors) at specific temperatures, thereby facilitating the measurement of total NO x concentration [1,12,[18][19][20][21][22][23]. Impedance-based gas sensors for gas detection may help diesel vehicles meet future NO x OBD requirements.…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

“…Subsequently, Miura et al [18] further proposed an equivalent circuit model for the NO x sensor in a followup publication. Their circuit consists of a Voigt circuit with two Voigt elements:…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

“…It was suggested that this resistance or even the entire real component of impedance could be used to determine NO x concentration at low frequency however, the measurement should be taken by measuring complex impedance and by calculating the real component of resistance. In both these publications, Miura et al called for further investigation in order to ascertain the sensing properties and detailed mechanism [12,18].…”

Section: Nitrogen Oxidesmentioning

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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“…The diameter of the semicircle has interpreted as the resistance of the electrode reaction. 21) Considering the complex impedance measurement and Fig. 4.…”

Section: Characteristics Of Synthesized Oxides As a Sensing Electrodementioning

confidence: 99%

Amperometric-type NOx sensor based on YSZ electrolyte and La-based perovskite-type oxide sensing electrode

Ueda

Nagano

Okawa

et al. 2010

J. Ceram. Soc. Japan

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At present, lean-burn type engines or diesel engines for passenger cars have been developed and installed into automobiles to improve fuel efficiency. In these cases, NOx storage catalysts or selective catalytic reduction (SCR) systems are also installed for reducing NOx emission. In order to control these systems more efficiently, NOx sensor which responds selectively, quickly, and quantitatively are necessary. Here we focused on the NO direct decomposition function of La-based perovskite oxides. We applied them to a sensing electrode for the amperometric NOx sensor using yttria-stabilized zirconia (YSZ). La0.8Sr0.2MO3 (M = Co, Mn, Fe, Ni) powders were synthesized by means of spray pyrolysis method. Among four kinds of oxides studied, the sensor using La0.8Sr0.2MnO3-SE showed the highest sensitivity to NO2 as well as low base current even in the presence of excess O2 (21 vol%). The sensor also exhibited excellent NO2 selectivity at 500°C. The sensitivity was increased with an increase of NO2 concentration in an examined range between 50 to 800 ppm, and did not change in the examined O2 concentration range (5−21 vol%).

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Impedancemetric gas sensor based on zirconia solid electrolyte and oxide sensing electrode for detecting total NO at high temperature

Cited by 182 publications

References 19 publications

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

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

Amperometric-type NOx sensor based on YSZ electrolyte and La-based perovskite-type oxide sensing electrode

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Impedancemetric gas sensor based on zirconia solid electrolyte and oxide sensing electrode for detecting total NO at high temperature

Cited by 182 publications

References 19 publications

Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

Impedance Analysis of Electrochemical NOx Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

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

Amperometric-type NOx sensor based on YSZ electrolyte and La-based perovskite-type oxide sensing electrode

Contact Info

Product

Resources

About

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell

Impedance Analysis of Electrochemical NO_x Sensor Using a Au/Yttria-Stabilized Zirconia (YSZ)/Au cell