Abstract
A solid-state planar sensor consisting of scandia-stabilised zirconia (8 mol% Sc 2O 3–ZrO 2) solid electrolyte sandwiched between CuO + CuCr 2O 4 mixed-oxide and Au foil electrodes has been tested in NO 2 containing gaseous atmosphere in the range of 100–500 ppm NO 2 at 611 and 658 °C. The sensor has been found to respond consistently to change in concentration of NO 2 in the oxygen rich gas mixture at 611 and 658 °C within 8 s. The sensor showed negligible cross-sensitivity to O 2, CO and CH 4 in the gas stream at 611 °C and 658 °C.
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