Study On Preparation Of Sr_xCe_0.45Zr_0.45Y_0.1O_3-δ And Application In Hydrogen Sensor

The sintering, chemical stability and electrical characteristic of xZnO+CaZr0.9In0.1O3-δ(0.02≤x≤0.10) and SrxCe0.45Zr0.45Y0.1O3-δ(0.90≤x≤1.20) were investigated. A type of limiting current hydrogen sensor using SrxCe0.45Zr0.45Y0.1O3-δas an electrolyte and Ce0.90Y0.10O2/SrxCe0.45Zr0.45Y0.1O3-δas dense diffusion barrier was constructed.1)Experimental results show that ZnO can significantly lower the sintering temperature of CaZr0.9In0.1O3-δ. The x-ray diffraction (XRD) patterns showed that xZnO+CaZr0.9In0.1O3-δ(0.02≤x≤0.10) still maintain a single perovskite type;.the total conductivity of 0.02ZnO+CaZr0.9In0.1O3-δis 4.89×10-4Scm-1, 4.05×10-4Scm-1 and 3.86×10-4Scm-1 in air,Ar and 4000ppm H2 at 800℃.2)SrxCe0.45Zr0.45Y0.1O3-δwere synthesized by high temperature solid-state reaction, and the phase, microstructure, sintering behavior.Chemical stability and conductivity were investigated. X-ray diffraction (XRD) patterns showed that SrxCe0.45Zr0.45Y0.1O3-δstill maintain a single perovskite type while x in the range of 0.90~1.20; the sinterability improved with increasing x concentration from SEM photographs; the chemical stability of material was steady while x<1; the nonstoichiometric specimens(make an exception of x=0.90) have higher conductivities than Sr(CeZr)0.9Y0.1O3-δ.3)There is a good bonding between proton conductor and barrier layer for limiting current hydrogen sensor. Nearly flat limiting currents are observed at a hydrogen concentration in the range of 200-10000ppm 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 0.991μA·ppm-1 at 800℃.