Planar, Impedance-Metric NOX Sensor with NiO Sensing Electrode for High Temperature Applications

Stranzenbach, Mathias; Saruhan, Bilge

doi:10.1109/sensor.2007.4300297

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…In order to understand why the nanofiber sensor exhibited better sensing performance than the powder sensor, a complex impedance measurement was performed. Figure 4(a) shows the Nyquist plots of impedance obtained from the sensors at an open circuit in synthetic air and a mixture of air with 500 ppm CO at 550 • C. For both the sensors, a semi-arc appeared in the high-frequency region (figure 4(b)) and a large tail dominated in the low-frequency region, which was similar to the impedance spectra reported previously [27,28]. When the sensors were exposed to CO gas, the high-frequency semi-arc did not change while the low-frequency tail moved down to the X-axis.…”

Section: Resultssupporting

confidence: 80%

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

et al. 2012

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Lanthanum strontium manganite (La(0.8)Sr(0.2)MnO(3), LSM) nanofibers have been synthesized by the electrospinning method. The electrospun nanofibers are intact without morphological and structural changes after annealing at 1050 °C. The LSM nanofibers are employed as the sensing electrode of an electrochemical sensor with yttria-stabilized zirconia (YSZ) electrolyte for carbon monoxide detection at high temperatures over 500 °C. The electrospun nanofibers form a porous network electrode, which provides a continuous pathway for charge transport. In addition, the nanofibers possess a higher specific surface area than conventional micron-sized powders. As a result, the nanofiber electrode exhibits a higher electromotive force and better electro-catalytic activity toward CO oxidation. Therefore, the sensor with the nanofiber electrode shows a higher sensitivity, lower limit of detection and faster response to CO than a sensor with a powder electrode.

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Section: Resultssupporting

confidence: 80%

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

et al. 2012

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“…Furthermore, ion-exchanging SSZ-13 with metal ions is known to enhance NO 2 SCR (Cu, Ni, Fe) ,,− and will increase any electrical response compared to the bare zeolites. Our previous successes , using Ni-based MOFs to detect NO 2 , coupled with widespread literature reports − of NiO x -based sensors for NO x , led us to downselect Ni-SSZ-13 for a new NO 2 sensor under near-ambient conditions.…”

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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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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“…Unlike NiCr 2 O 4 , which showed a clear dependence on oxygen concentration, the specimens with NiO-SE showed only a slight cross-selectivity to oxygen [26,27]. Furthermore, the sensor specimens with NiCr 2 O 4 -SE show also cross-selectivity towards reducing gases like CH 4 or CO, which can be suppressed by applying a Pt-collector electrode on top of the SE-material in use at lean atmospheres [28].…”

Section: Sensor Developmentmentioning

confidence: 99%

An integrated solution for NO_x‐reduction and ‐control under lean‐burn conditions

Saruhan

Stranzenbach

Rodríguez

2007

Materialwissenschaft Werkst

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Dedicated to Prof. Wolfgang Bunk on the occasion of his 80th birthdayUpcoming emission regulations order highly effective NO x -reduction systems in lean-burn engines requiring new catalytic materials and integrated control of the reduction process. Thus, new approaches for NO x -reduction and its monitoring over an OnBoard-Diagnostic (OBD) system are suggested throughout the globe. A promising attempt is the development of a catalytic system having an integrated NO x -sensor, based on selective catalytic reduction process and impedance sensors. The study displays the results achieved both with a perovskite type of self-regenerative catalyst functioning by H 2 -reductant and with impedance NO x -sensors. The catalysts were tested at the temperature range of 150 C to 360 C yielding NO x conversion rates of 92 % with high selectivity to N 2 .

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Planar, Impedance-Metric NOX Sensor with NiO Sensing Electrode for High Temperature Applications

Cited by 6 publications

References 5 publications

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

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

An integrated solution for NO_x‐reduction and ‐control under lean‐burn conditions

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Planar, Impedance-Metric NOX Sensor with NiO Sensing Electrode for High Temperature Applications

Cited by 6 publications

References 5 publications

Electrospun La0.8Sr0.2MnO3nanofibers for a high-temperature electrochemical carbon monoxide sensor

Electrospun La0.8Sr0.2MnO3nanofibers for a high-temperature electrochemical carbon monoxide sensor

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

An integrated solution for NOx‐reduction and ‐control under lean‐burn conditions

Contact Info

Product

Resources

About

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

Electrospun La_0.8Sr_0.2MnO₃nanofibers for a high-temperature electrochemical carbon monoxide sensor

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

An integrated solution for NO_x‐reduction and ‐control under lean‐burn conditions