Abstract
Potentiometric sensors based on zirconia can be used for determining gaseous NO at temperatures between 400 and 480 °C. For such mixed potential sensors, NO sensitive electrode materials such as CdMn2O4 and V2O5 have been described. In order to improve the cell voltage response, composite electrode materials based on V2O5-γ-Al2O3 were investigated. Sensors employing these materials show a better voltage response and an improved adhesion to the solid electrolyte compared with pure V2O5. The optimal temperature was found to be 440 °C. The NO sensitivity is nearly independent on the oxygen partial pressure in the gas.
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