Nd_2CuO_4/4YSZ/Pt素子の直流電流におけるNO_x応答特性

概要

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The NO_x response properties in dc current of an Nd_2CuO_4/Y_2O_3 (4 mol%)-stabilized ZrO_2 (4YSZ)/Pt element were investigated in both air and 5 %O_2-N_2 mixed gas at 400℃. The current increased in proportion to the logarithm of NO_x concentration, even when two electrodes were exposed to the same atmosphere. When Nd_2CuO_4 was used as the cathode, the ratio of current in NO_x to that in carrier gas at 1 V was larger for NO_2 than that for NO and not affected by the variation of oxygen concentration within 5 to 20% in carrier gas. In contrast, when Pt was used as the cathode, the current ratio was dependent on the oxygen concentration. Impedance analysis showed decreases in resistance and capacitance at the electrolyte/electrode interfaces with the introduction of NO_x gas. The possibility of a NO_x gas sensor unaffected by ambient oxygen concentration was suggested.
1996-11-01