Abstract
The NO2 and NO sensing behavior of a Cr2O3/YSZ/Pt potentiometric sensor was studied in 3 - 21% O2 at 450 - 700 ºC and compared with that of a WO3-based potentiometric sensor. A positive voltage response is shown for NO2 and negative for NO, and a linear relationship is generally attained in the plot of the emf vs. the logarithm of NO2 and NO concentration. The Cr2O3 sensor shows very similar tendency in NO2 selectivity to the WO3 sensor, but their NO selectivities are different from each other. The selective NO2 detection is commonly achieved against CO and CO2, being consistent with a CO- and CO2-independent NO2 profile in the TPR results. In contrast, the Cr2O3 sensor is not NO selective against CO. The NO+CO+O2 TPR profile showing no gas concentration changes up to 800 ºC indicates that the CO- induced change in the NO sensitivity is seemingly adsorption- related.
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