致密扩散障碍层极限电流型氢传感器

Dense Diffusion Barrier Limiting Current Hydrogen Sensor

使用BaCe0.9Y0.1O3-δ作为固体电解质,SrCe0.95Tm0.05O3-δ为致密扩散障碍层,制备了新型致密扩散障碍层极限电流型氢传感器。采用X射线衍射仪、扫描电子显微镜表征了氢传感器上下两层材料的物相和微观结构,应用IM6e型电化学工作站测试了其氢敏性能。结果表明,1550℃烧结10h可以获得单相致密的钙钛矿结构BaCe0.9Y0.1O3-δ和SrCe0.95Tm0.05O3-δ。氢传感器在600～800℃,氢浓度小于17700μL·L-1时,具有良好的极限电流平台,极限电流与氢浓度成线性关系。传感器的灵敏度随测试温度的升高而增大,800℃时其灵敏度达1.30μA·(μL·L-1)-1。

A dense diffusion barrier limiting current hydrogen sensor was developed, with BaCe0.9Y0.1O3-δ as proton conduction solid electrolyte and SrCe0.95Tm0.05O3-δ 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 IM6e electrochemical workstation. The results indicate that pure and dense perovskite BaCe0.9Y0.1O3-δ and SrCe0.95Tm0.05O3-δ are obtained at sintering temperature of 1 550℃ for 10 h. Nearly flat limiting currents for hydrogen sensor are observed at a hydrogen concentration less than 17 700 μL·L^-1 at testing temperature from 600℃ to 800℃. There is an excellent linear relationship between hydrogen concentration and limiting current. The sensitivity to hydrogen increases with temperature and it is 1.30μA·（μL·L^-1）^-1 at 800℃.