Microstructure, Conductivity, and NO2 Sensing Characteristics of α-Al2O3-Doped (8 mol% Sc2O3)ZrO2 Composite Solid Electrolyte |
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Authors: | Weizhen Xiong Girish M Kale |
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Affiliation: | Institute for Materials Research, University of Leeds, Leeds LS2 9JT, U.K. |
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Abstract: | α-Al2O3-doped (8 mol % Sc2O3)ZrO2 composite solid electrolyte has been investigated in the fabrication of solid-state ceramic gas sensors. The microstructure and electrical conductivity of the composite solid electrolyte have been measured over a range of temperature from 240°C to 596°C. The composite solid electrolyte has been found to exhibit a higher conductivity compared with the commonly used (8 mol% Y2O3)ZrO2 at temperatures above ~448°C. The sensing characteristics for NO2 detection have been studied in the temperature range of 500–650°C at the low concentration from 10 to 30 ppm and at high concentration from 100 to 500 ppm of NO2. The NO2 sensor was found to respond reproducibly and rapidly to the variations of NO2, concentration, indicating that the composite solid electrolyte has promising application as a solid electrolyte for on-board exhaust gas monitoring. |
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