Sensing characteristics of a limiting current oxygen sensor with (8YSZ)0.85(Cr2O3)0.15 dense diffusion barrier

(8YSZ) 1− x (Cr 2 O 3 ) x ( x  = 0, 0.05, 0.10, 0.15) are prepared by the co-precipitation method. Diffraction peaks of the samples belonged to the cubic fluorite structure. Conductivity decreases first and then increases with increasing Cr 2 O 3 content. An oxygen sensor based on 8YSZ solid electrolyte and (8YSZ) 0.85 (Cr 2 O 3 ) 0.15 diffusion barrier is prepared by the Pt slurry bonding method. The sensor has a limiting current plateau at 2% oxygen concentrations within 720 ~ 870 °C. The oxygen sensor has a linear relationship between the log I L and 1000/ T . At 850 °C, a linear relationship between the limiting current I L and oxygen concentration x (O 2 ) is established for the oxygen sensor. The oxygen sensor is provided with a limiting current plateau within the experimental concentration division, and the limiting current plateau is not affected by x (CO 2 ) and p (H 2 O). I-V curves of the oxygen sensor overlap, and the limiting current plateaus are almost equal under the long-term high-temperature operating conditions of 144 h.