Ti-Doped AgNbO₃ as Novel Dense Diffusion Barriers of Limiting Current Oxygen Sensors

The oxygen sensors with limiting current derived from a dense diffusion barrier have an excellent advantage of detecting oxygen partial pressure by controlling the ratio of air and fuel in combustion environments. Therefore, AgNb1-x Ti x O3-delta (wherein x varies from 0.1 to 0.3) was prepared as such a dense diffusion barrier layer for sensor application. Among the investigated compositions as a new condensed barrier for the diffusion of sensors, AgNb1-x Ti x O3-delta (x = 0.1, 0.2, 0.3) exhibits oxygen ionic conductivities from 1.37 x 10(-4) to 5.78 x 10(-3 );cm(-1) in the temperature range of 600-900 degrees and outstanding stable electrochemical properties. Herein, we employ these novel materials as dense diffusion barriers and 8 mol % zirconia stabilized by yttria (8YSZ) as a solid-state electrolyte for the fabrication of the oxygen sensors with limiting current. We observed a direct connection between the limiting current and oxygen content within the interval of 0.5-5.0 mol % at 800 degrees and a low working voltage. The increase of Ti-doping amount in AgNbO3 accelerates the sensing response to oxygen gas and promotes the service life of the sensor.