Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 296, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.126644
Keywords
SO2 sensor; Stabilized zirconia; Mixed-potential; ZnTiO3
Funding
- National Nature Science Foundation of China [61831011, 61327804, 61520106003, 61803171]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National Key Research and Development Program of China [2016YFC0207300, 2016YFC 0201002]
- Application and Basic Research of Jilin Province [20130102010 JC]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Program for JLU Science and Technology Innovative Research Team [JLUSTIRT 2017TD-07]
- Fundamental Research Funds for the Central Universities, China Postdoctoral Science Foundation [2018M630322, 2018M630319, 2018T110244]
- Jilin Provincial Science and Technology Development Program [20190103155JH]
- Jilin Provincial Education Department Science and Technology Project [JJKH20190114KJ]
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This paper deals with solid state electrolyte type gas sensors based on mixed potential mechanism using yttria-stabilized zirconia (YSZ) as solid electrolyte and MTiO3 (M: Zn, Co and Ni) as sensing electrodes (SEs) for monitoring very low concentrations of SO2 in atmospheric environments. Among all the devices attached with different SEs, ZnTiO3-SE brought about the highest response value of -22.5 mV to 1 ppm SO2 at 600 degrees C and even down to 100 ppb SO2 with the response value of -2.5 mV. Meanwhile, the measured Delta V of the sensor was found to vary linearly as a function of the logarithm of SO2 concentration in the range of 100 ppb(-2) ppm at 600 degrees C and the sensitivity (slop) was -23 mV/decade. In addition, the sensor coupled with ZnTiO3-SE gave negligible responses to other interfering gases such as C2H2, CH4, CO, NO2, NO, NH3. Furthermore, the present sensor possessed good repeatability, slightly affected by the change of oxygen concentration and relatively stability during 20 days of continuous high-temperature operation. Moreover, the polarization-curve measurements demonstrated that the good agreement between the observed sensitivity and the estimated value, confirming that the sensing mechanism was based on mixed-potential model.
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