【作者】：Fangmeng Liu*, Jing Wang, Li Jiang, Rui You, Qingji Wang, Caileng Wang, Zetian Lin, Zijie Yang, Junming He, Ao Liu, Peng Sun, Xu Yan, Geyu Lu*
【题目】：Compact and planar type rapid response ppb-level SO2 sensor based on stabilized zirconia and SrMoO4 sensing electrode
【关键词】：So2 sensor, Ppb-level, SrMoO4, Stabilized zirconia, Mixed-potential
【版面信息】：Sensors & Actuators: B. Chemical 307 (2020) 127655
摘要:
The planar yttria-stabilized zirconia (YSZ) solid electrolyte based mixed potential type gas sensing devices attached with molybdate MMoO4(M: Ni, Co, Zn, Mn and Sr) sensing electrodes (SEs) were designed and fabricated, attempting to sensitively and rapidly monitor ppb-level SO2. The sensor using SrMoO4-SE possessed the highest potential response signal of -37.5 mV to 500 ppb SO2at 550℃. More importantly, the low detection limit of 20 ppb SO2and fast response time of 37 s to 200 ppb SO2were presented for the device utilizing SrMoO4-SE at 550℃. The linear dependence between response value and the SO2concentration logarithm in the range of 0.02-1 ppm was observed, which the sensitivity (slop) was -29 mV/decade. Furthermore, the sensor also showed excellent selectivity, reproducibility and high temperature stability of 7 days to SO2at 550℃. The mixed potential sensing mechanism was discussed and further verified based on the measurement of polarization curves.
