期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 83, 期 1-3, 页码 222-229出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(01)01044-9
关键词
NOx sensor; potentiometric sensor; mixed potential; oxide electrode; stabilized zirconia; spinel-type oxide; ZnFe2O4
Electrochemical sensors using tubular yttria-stabilized zirconia (YSZ) and the spinel-type oxide sensing-electrode (SE) were fabricated and examined for NOx detection at high temperatures. For a mixed-potential type NOx sensor, ZnFe2O4 has been found to give the highest NO sensitivity among the other spinel-type oxides tested and reported to date. The ZnFe2O4-attached device gave a linear correlation between emf and the logarithm of NO2 (NO) concentration from 50 to 436 ppm in the high temperature range 600-700 degreesC. The sensing mechanism of the sensor has been discussed on the basis of the gas adsorption-desorption behavior and the catalytic activity for the oxides examined. (C) 2002 Elsevier Science B.V. All rights reserved.
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