WANG Guangwei ^{1, 2}, CHEN Hongzhen ², LI Youfeng ¹, XIE Bo ¹, PAN Qi ¹

(1. Zunyi Normal University, Zunyi 563006, Guizhou, China; 2. Chongqing Institute of Green and
Intelligent Technology (CIGIT), Chongqing 400714, China)

Abstract: YSZ based CO₂ sensors having Li₂CO₃-Li and Ba co-doped oxycarbonates as their sensing electrodes were designed and studied by XRD, SEM, and CO₂ response detection. The results indicated that the sintering techniques of the sensing electrodes affect sensor performance. Probably due to the good distribution of Li and Ba co-doped oxycarbonates in the Li₂CO₃ particles, the sensor sintered at 710 ℃ for 3 h had approximately 2 transferred electrons, responded well to the alteration of CO₂ concentration and exhibited good thermal stability. As the sintering time further increased, the response characteristics of the sensors did not change obviously. However, the sensor sintered for short time could be improved by some extent of heat treatment.
Key words: oxycarbonate; complex sensing electrode; sintering; CO₂ sensor; response