Dense Diffusion Barrier Limiting Current Hydrogen Sensor

A dense diffusion barrier limiting current hydrogen sensor was developed, with BaCe0.9Y0.1O3-delta as proton conduction solid electrolyte and SrCe0.95Tm0.05O3-delta as dense diffusion barrier. The crystalline phase and microstructures of above-below two layers for hydrogen sensor were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Hydrogen sensing properties of the sensor were investigated by We electrochemical workstation. The results indicate that pure and dense perovskite BaCe0.9Y0.1O3-delta and are obtained at sintering temperature of 1 550 degrees C for 10 h. Nearly flat limiting currents for hydrogen sensor are observed at a hydrogen concentration less than 17 700 mu L.L-1 at testing temperature from 600 degrees C to 800 degrees C. There is an excellent linear relationship between hydrogen concentration and limiting current. The sensitivity to hydrogen increases with temperature and It is 1.30 mu A . (mu L.L-1)(-1) at 800 degrees C.