Abstract
A mixed-potential-type sensor was fabricated by using yttria-stabilized zirconia (YSZ) and various zinc-based oxide sensing-electrodes (SEs) aiming at detection of hydrocarbons (HCs) in automobile exhausts. Among the various zinc-based oxide-SEs examined, ZnCr2O4 was found to give highly selective and sensitive response to C3H6 (propene) at 550oC even in the presence of 5 vol.% H2O. The Δemf (electromotive force) of the sensor showed almost linear dependence with the logarithm of C3H6 concentration. The sensitivity to 100 ppm C3H6 was found to hardly affect by the change in concentration of water vapor or O2. In addition, it was found that the sensitivity of the present sensor varied linearly with the carbon number of various HCs examined.
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