Sensing property of limiting current oxygen sensor with (8YSZ)0.4(CeO2)0.6 dense diffusion barrier based on 8YSZ solid electrolyte

In this manuscript, (8YSZ) 1- x (CeO 2 ) x (0 ≤  x  ≤ 0.6), belonging to the cubic fluorite structure, was prepared by a co-precipitation method. We highlighted the effect of a dense diffusion barrier conductivity on the sensing performance by choosing the lowest conductivity of (8YSZ) 0.4 (CeO 2 ) 0.6 as a dense diffusion barrier compared with the highest conductivity of (8YSZ) 0.9 (CeO 2 ) 0.1 published. A sensor was fabricated using bonding Pt paste. Limiting current ( I L ) platforms were obtained at different oxygen concentrations x (O 2 ) in a temperature range of 720–900 °C. The oxygen sensor had a smaller oxygen measurement range of 0–10% at 850 °C compared to (8YSZ) 0.9 (CeO 2 ) 0.1 as a diffusion layer . These results showed that the higher oxide ion conductivity of the diffusion layer can achieve a wider oxygen measurement range, which can guide the search for new mixed conductor with higher oxide ion conductivity. The sensing performance of the oxygen sensor was not influenced by p (H 2 O) and x (CO 2 ), which showed the sensor had a strong selectivity towards oxygen. Furthermore, the limiting current of the sensor remained stable during 144 h of detection.