Effects of Porous Structure of the Auxiliary Electrode on the CO2 Sensing Properties of a NASICON-based Sensor

Structural effects of the auxiliary electrode layer on the CO_2 sensing properties of NASICON (Na_3Zr_2Si_2PO_) solid electrolyte sensors have been investigated. The sensor with a macroporous Li_2CO_3-BaCO_3-based auxiliary layer showed faster CO_2 response and recovery and a smaller EMF drift against a humidity change than those observed for the sensor equipped with a dense auxiliary layer. The CO_2 response of the present sensors was slightly larger than the theoretical one. This suggests the existence of some impurities capable of reacting with CO_2 in the auxiliary layer prepared in the present study.Nagasaki Symposium on Nano-Dynamics 2008 (NSND2008) 平成20年1月29日(火)於長崎大学 Poster Presentatio