Solid electrolyte impedancemetric NOx sensor attached with zeolite receptor

Nakano, Hikaru; Takase, Satoko; Song, Jeonghwan

doi:10.1016/j.snb.2018.02.146

Cited by 16 publications

(9 citation statements)

References 37 publications

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“…However, a direct comparison of the NO 2 sensor response demonstrated here to other zeolite materials under the presented conditions is difficult. Most examples of NO 2 sensors using zeolites tend to use them as a filter layer and not as the active sensing medium. − One such study that focused on NO 2 detection using H-ZSM-5 zeolite and WO 3 (performed at a much higher temperature of 350 °C) demonstrated an ∼200× change in resistance when exposed to 5 ppm NO 2 (with 50 ppm CO), which corresponded to a 19× increase in response compared to a control sensor . While this is larger than the demonstrated response presented here, it is utilizing zeolite as a filter layer, with WO 3 being the active sensing material.…”

Section: Resultsmentioning

confidence: 71%

“…Many reports leverage zeolites as both room-temperature sensors and high-temperature (>200 °C) gas sensors, including for NO 2 detection. , However, such high temperatures preclude the development of low-power sensors under near-ambient conditions. A few NO 2 sensing reports occur near room temperature, and many use zeolite as a passive filter to enhance the selectivity of an underlying electrode sensing layer. − This is because the sensor is not actively measuring the electrical properties of the zeolite.…”

Section: Introductionmentioning

confidence: 99%

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Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Percival

Henkelis

et al. 2021

Ind. Eng. Chem. Res.

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A novel sensor composed of a nickel-loaded SSZ-13 zeolite membrane on interdigitated electrodes (IDEs) is demonstrated as a direct electrical NO2 readout sensor. This NO2 adsorbent is made by homogeneously loading SSZ-13 zeolite with nickel(II) through a liquid-phase ion-exchange procedure. Exposure of the zeolite-based sensor to trace NO2 gas elicits an electrical impedance response measured at a single frequency. The sensor shows the same final change in impedance magnitude upon equilibration to different concentrations of trace NO2 in N2, suggesting that the occupation and eventual saturation of adsorption sites lead to the impedance change. However, the NO2 concentration can be determined through analysis of the rate of impedance change, where lower concentrations of NO2 lead to larger time constants with a logarithmic relationship to the NO2 concentration. Two time constants were observed from the linearized impedance plots, a fast one (τ1) and a slow one (τ2), where τ2 showed a larger dependence on the NO2 concentration, increasing faster than τ1 as the NO2 concentration decreased. Furthermore, the Ni-SSZ-13 sensor response is partially reversible in an inert gas environment, indicating the reversible adsorption of NO2 at nickel surface sites. Under exposure to humid air, differentiation between humid air and dry 5 ppm NO2 is accomplished by examination of the real component of the impedance signal. The resulting NO2 atmosphere shows an increase in the real component (more resistive), whereas the humid air shows a decrease (more capacitive). These results indicate that control of metal-ion loading into SSZ-13 may allow these NO2 selective catalytic reduction catalysts to be further leveraged as low-temperature NO2 sensors.

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Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Percival

Henkelis

et al. 2021

Ind. Eng. Chem. Res.

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“…However, despite the benefits of modern diesel engines, the exhaust generated contains nitric oxides (i.e., NO x ) that contribute to air pollution. Efforts to substantially reduce NO x emissions are necessitated by the push toward near-zero emissions by regulatory agencies in the United States and other countries [ 1 , 2 , 3 , 4 , 5 ]. Progress in diesel exhaust remediation has created the need for higher-accuracy NO x sensors for onboard diagnostic systems to monitor and regulate diesel engine operation.…”

Section: Introductionmentioning

confidence: 99%

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

et al. 2022

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Composite NOx sensors were fabricated by combining partially and fully stabilized yttria-doped zirconia with alumina forming a composite electrolyte, Y2O3-ZrO2-Al2O3, and strontium-doped lanthanum manganese oxide mixed with gold to form the composite sensing electrode, La0.8 Sr0.2MnO3-Au. A surface chemistry analysis of the composite sensor was conducted to interpret defects and the structural phases present at the Y2O3-ZrO2-Al2O3 electrolyte, as well as the charge conduction mechanism at the LaSrMnO3-Au electrode surface. Based on the surface chemistry analysis, ionic and electronic transport properties, and microstructural features of sensor components, the working principle was described for NOx sensing at the composite sensor. The role of the composite materials on the NOx sensing response, cross-sensitivity to O2, H2O, CO, CO2, and CH4, and the response/recovery rates relative to sensor accuracy were characterized by operating the composite NOx sensors via the impedimetric method. The composite sensors were operated at temperatures ranging from 575 to 675 °C in dry and humidified gas environments with NO and NO2 concentrations varying from 0 to 100 ppm, where the balance gas was N2. It was found that the microstructure of the composite NOx sensor electrolyte and sensing electrode had a significant effect on interfacial reactions at the triple phase boundary, as well as the density of active sites for oxygen reactions. Overall, the composite NOx sensor microstructure enabled a high NOx sensing response, along with low cross-sensitivity to O2, CO, CO2, and CH4, and promoted NO detection down to 2 ppm.

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“…NO x sensor is a key device to control this problem by monitoring the NO x content in exhaust gas and optimizing the fueling combustion process [ 2 , 3 , 4 ]. At present, NO x sensors are mainly divided into the following four types: potential type, mixed potential type, complex impedance type and current type [ 5 , 6 , 7 , 8 ], of which the current type sensor is the only one commercially used until now. The structure of this type of NO x sensor is shown in Figure 1 a which contains a small hole in the left side for the exhaust gas to enter.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Temperature on Adhesion Property and Electrochemical Activity of Pt/YSZ Electrode

et al. 2022

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The (Pt/YSZ)/YSZ sensor unit is the basic component of the NOx sensor, which can detect the emission of nitrogen oxides in exhaust fumes and optimize the fuel combustion process. In this work, the effect of sintering temperature on adhesion property and electrochemical activity of Pt/YSZ electrode was investigated. Pt/YSZ electrodes were prepared at different sintering temperatures. The microstructure of the Pt/YSZ electrodes, as well as the interface between Pt/YSZ electrode and YSZ electrolyte, were observed by SEM. Chronoamperometry, linear scan voltammetry, and AC impedance were tested by the electrochemical workstation. The results show that increasing the sintering temperature (≤1500 °C) helped to improve adhesion property and electrochemical activity of the Pt/YSZ electrode, which benefited from the formation of the porous structure of the Pt/YSZ electrode. For the (Pt/YSZ) electrode/YSZ electrolyte system, O2− in YSZ is converted into chemisorbed O2 on Pt/YSZ, which is desorbed into the gas phase in the form of molecular oxygen; this process could be the rate-controlling step of the anodic reaction. Increasing the sintering temperature (≤1500 °C) could reduce the reaction activation energy of the Pt/YSZ electrode. The activation energy reaches the minimum value (1.02 eV) when the sintering temperature is 1500 °C.

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Solid electrolyte impedancemetric NOx sensor attached with zeolite receptor

Cited by 16 publications

References 37 publications

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

Effect of Sintering Temperature on Adhesion Property and Electrochemical Activity of Pt/YSZ Electrode

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Solid electrolyte impedancemetric NOx sensor attached with zeolite receptor

Cited by 16 publications

References 37 publications

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO2

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO2

Investigation of an Impedimetric LaSrMnO3-Au/Y2O3-ZrO2-Al2O3 Composite NOx Sensor

Effect of Sintering Temperature on Adhesion Property and Electrochemical Activity of Pt/YSZ Electrode

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Product

Resources

About

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂

Nickel-Loaded SSZ-13 Zeolite-Based Sensor for the Direct Electrical Readout Detection of NO₂