Mixed-potential-type NO2 sensors based on stabilized zirconia and CeO2-B2O3 (B = Fe, Cr) binary nanocomposites sensing electrodes.
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| Title: | Mixed-potential-type NO2 sensors based on stabilized zirconia and CeO2-B2O3 (B = Fe, Cr) binary nanocomposites sensing electrodes. |
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| Authors: | You, Rui1, Wang, Tianshuang2, Yu, Hongyan1, Wang, Jing2, Lu, Geyu2, Liu, Fangmeng2 liufangmeng@jlu.edu.cn, Cui, Tianhong3 tcui@me.umn.edu |
| Source: | Sensors & Actuators B: Chemical. Aug2018, Vol. 266, p793-804. 12p. |
| Subjects: | Zirconium oxide, Electrodes, Nanocomposite materials, Gas detectors, Oxides |
| Abstract: | Mixed-potential type (MPT) NO 2 sensors equipped with CeO 2 -B 2 O 3 (B = Fe, Cr) sensing electrode (SE) and yttria-stabilized-zirconia (YSZ-8Y) electrolyte are fabricated. The new ceria-based nanocomposites synthesized by sol-gel method improve the NO 2 gas sensing properties significantly. The highest response to NO 2 is found for the sensor using CeO 2 -Cr 2 O 3 binary oxides with 1:1 Ce/Cr sintered at 800 °C, resulting in 100 mV to 100 ppm with relatively fast response and recovery times at the working temperature of 450 °C. A linear relation is obtained for the sensor with configuration of Pt/YSZ/CeO 2 -B 2 O 3 (B = Fe, Cr) between potential difference (ΔV) and the logarithm of the concentration of NO 2 from 5 to 200 ppm, which the sensitivities are 40.5 and 74.0 mV/decade, respectively. Additionally, the sensor’s reproducibility, selectivity, cross-sensitivity and stability are investigated in details. Furthermore, the mixed potential sensing mechanism and catalytic activity to NO 2 for ceria-based nanocomposites are also discussed. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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