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- W2110347978 abstract "The role of porosity on impedancemetric NOx sensing was investigated for sensors composed of a porous Y-stabilized ZrO2 (YSZ) electrolyte and Au wire electrodes. NOx sensors were fabricated at firing temperatures of 950°C, 1000°C, and 1050°C to establish different porous microstructures. Porosity calculations were determined from scanning electron microscopy images of the porous electrolytes using a three-dimensional statistical method. The mean porosity of sensors fired at 950°C was 50.2%, and the mean porosity value decreased to 46.7% for sensors fired at 1050°C. Impedance spectroscopy was used to measure the electrical response of the sensors while operating at 650°C, in gas atmospheres of 0–100 ppm NOx and O2 concentrations ranging from 1–18% in a balance of N2. The impedance of the sensors demonstrated a strong dependence on porosity as a decrease in porosity of about 4% resulted in nearly a 50% decrease in the impedance. Analysis of the impedance data indicted NOx sensitivity increased as the YSZ electrolyte porosity decreased. The response to NOx concentrations ≤ 10 ppm were distinguishable at operating frequencies as high as 40 Hz enabling rapid sensing." @default.
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- W2110347978 date "2013-12-17" @default.
- W2110347978 modified "2023-10-17" @default.
- W2110347978 title "Influence of Microstructure on the Sensing Behavior of NO<sub>x</sub>Exhaust Gas Sensors" @default.
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- W2110347978 doi "https://doi.org/10.1149/2.019403jes" @default.
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