FY2011 Progress Report: Agreement 8697 - NOx Sensor Development

Woo, Leta; Glass, Robert J.

doi:10.2172/1035304

Cited by 2 publications

(5 citation statements)

References 10 publications

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“…5), and NO 2 is decomposed into NO. [62][63][64][65] The expected response is achieved when concentration pulses from 50 to 200 ppm of NO 2 were performed: a small negative increase of voltage when the concentration is increased and this suggests that the reaction is taking place at the reference elec-trode (Figure 13a). In addition, the device was exposed to C 2 H 4 with a fixed concentration of NO 2 (Figure 13b).…”

Section: Anodic Reactionsmentioning

confidence: 90%

“…60,61 NO x sensors employing LSM as electrode has a particular configuration: LSM is employed in both electrodes but one of them is thicker 62 or denser. [63][64][65] This difference of thickness or density have a critical role in the sensor performance. When NO 2 diffuses through the porous pathway, the reduction gas phase reaction (Eq.…”

Section: Anodic Reactionsmentioning

confidence: 99%

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Influence of the Solid-Electrolyte Ionic Material in a Potentiometric Sensor for Ethylene Detection

Toldrá‐Reig¹,

Pastor²,

Serra³

2019

J. Electrochem. Soc.

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Potentiometric sensors based on metal oxides as electrodes and 8YSZ as electrolyte at 550°C can provide selective response to C 2 H 4 with low cross-sensitivity toward CO, H 2 O, C 14 H 10 and C 11 H 10 . The target of the present work is to evaluate the influence of the material used as electrolyte, the electrolyte thickness and the working temperature to check the effect of these parameters on the response to C 2 H 4 . After surface functionalization via Ni nanoparticle deposition onto the working electrode to improve the sensor performance, the effect of 8YSZ electrolyte thickness (from 0.1 to 1.2 mm) on the sensor response was studied. The best performance was achieved with the thinner electrolyte (0.1 mm) in terms of selectivity to C 2 H 4 and low cross-sensitivity toward CO. In second place, Ce 0.8 Gd 0.2 0 2-δ (CGO) and scandium-stabilized zirconia (ScSZ) oxide-ion conductors were tested as an alternative to 8YSZ to operate at lower temperatures. ScSZ and CGO based-devices provided promising sensing performance at 450°C and C 2 H 4 concentrations below 100 ppm in dry conditions upon functionalization of the working electrode with Ni nanoparticles. At 550°C, both electrolyte materials show a selective response to C 2 H 4 with low cross-sensitivity toward CO even in wet conditions or in presence of polyaromatics.

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Section: Anodic Reactionsmentioning

confidence: 90%

Section: Anodic Reactionsmentioning

confidence: 99%

Influence of the Solid-Electrolyte Ionic Material in a Potentiometric Sensor for Ethylene Detection

Toldrá‐Reig¹,

Pastor²,

Serra³

2019

J. Electrochem. Soc.

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“…The sensing behavior of various metals and metal oxides has been studied in exhaust gas environments for potential composite electrode materials for NO x sensors [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. The resistance of the nanostructured grain–grain boundaries of the metal oxide change as a function of the NO x gas upon surface adsorption of NO x molecules, which influences the depletion layer and potential barrier.…”

Section: Introductionmentioning

confidence: 99%

“…The resistance of the nanostructured grain–grain boundaries of the metal oxide change as a function of the NO x gas upon surface adsorption of NO x molecules, which influences the depletion layer and potential barrier. Thus, the overall electrical conductivity enhances the overall NO x sensitivity [ 9 , 14 ]. Some of these studies have found that combining a noble metal with a metal oxide can enhance the sensing response to the analyte gas.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these studies have found that combining a noble metal with a metal oxide can enhance the sensing response to the analyte gas. Furthermore, high sensitivity to NO x was achieved by varying the noble metal to metal oxide ratio composition, which was found to tailor the sensor response while achieving significantly less cross-sensitivity from interfering gases, thereby improving sensor accuracy for analyte gas [ 10 , 14 , 15 ]. For example, in work by Romanytsia et al, it was reported that composite sensing electrodes containing Au with 10 wt% yttria-stabilized zirconia (YSZ) produced significantly higher sensitivity to NO 2 with a more rapid response rate for NO 2 concentrations as low as 20 ppm, in comparison to NO x sensors, which were utilizing pure

sensing electrodes [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

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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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FY2011 Progress Report: Agreement 8697 - NOx Sensor Development

Cited by 2 publications

References 10 publications

Influence of the Solid-Electrolyte Ionic Material in a Potentiometric Sensor for Ethylene Detection

Influence of the Solid-Electrolyte Ionic Material in a Potentiometric Sensor for Ethylene Detection

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

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