Alkaline-Earth Metals-Doped Pyrochlore Gd₂Zr₂O₇ as Oxygen Conductors for Improved NO₂ Sensing Performance.

ABSTRACT: This work proposed a novel strategy to fabricate highly-stable NO₂ sensor based on a pyrochlore-phase Gd₂Zr₂O₇ oxygen conductor. The incorporation of alkaline-earth metals distinctly enhances the sensing performance of the Gd₂Zr₂O₇ based sensors. The excellent sensor based on Gd_1.95Ca_0.05Zr₂O_7+δ exhibits rapid response-recovery characteristics with the maximum response current value (ΔI = 6.4 μA), extremely short 90% responce (3 s) and 90% recovery (35 s) time towards 500 ppm NO₂ at 500 °C, which is better than that of commercial YSZ under the same condition. The ΔI value towards NO₂ is much higher than those towards other gases (CH₄, C

SUBMITTER: Zhong F 

PROVIDER: S-EPMC5498611 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature