| 摘要 |
The present invention is concerned with a NOx sensor consisting essentially of first and second electrodes in contact with a solid electrolyte, the sensor being capable of detecting a concentration of NOx in a gas by converting an amount of NOx concentration into an electromotive force level between the first and second electrodes. The electromotive force linearly increases in response to an increase, in terms of a logarithm, of NO2 concentration and linearly decreases in response to an increase, in terms of a logarithm, of NO concentration. At least the first electrode is composed of a metal oxide selected from the group consisting of Mn2O3, CdFe2O4, ZnFe3O4, CrFe2O4, Cr2CoO4 , CdGaMnO4 and YFeMnO4. The NOx sensor according to the invention has a good sensitivity without being affected by the concentration of CO2 and can detect NOx concentration in an exhaust gas at a temperature above 600.degree.C.
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