Solid-state potentiometric SO2 sensor combining NASICON with V2O5-doped TiO2 electrode
作者： X LIANG , T ZHONG , B QUAN , B WANG , H GUAN
DOI: 10.1016/J.SNB.2008.04.003
关键词: Response time 、 X-ray photoelectron spectroscopy 、 Electrode 、 Fast ion conductor 、 Doping 、 Potentiometric titration 、 Materials science 、 Sintering 、 Potentiometric sensor 、 Analytical chemistry
摘要: Abstract A compact tubular sensor based on NASICON (sodium super ionic conductor) and V2O5-doped TiO2 sensing electrode was designed for the detection of SO2. In order to reduce size sensor, a thick-film formed outer surface small Al2O3 tube; furthermore, thin layer with nanometer attached as electrode. This paper investigated influence V2O5 doping sintering temperature characteristics sensor. The 5 wt% sintered at 600 °C exhibited excellent properties 1–50 ppm SO2 in air 200–400 °C. EMF value almost proportional logarithm concentration sensitivity (slope) −78 mV/decade 300 °C. It also seen that showed good selectivity against NO, NO2, CH4, CO, NH3 CO2. Moreover, had speedy response kinetics too, 90% time 50 ppm 10 s, recovery 35 s. On basis XPS analysis SO2-adsorbed electrode, mechanism involving mixed potential proposed.
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