期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 388, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121772
关键词
Pt; PtS; Mixed-potential; Yttria-stabilized Zirconia; SO2
资金
- National Nature Science Foundation of China [61533021, 61973134, 61831011, 61520106003]
- National Key R&D Program of China [2016YFC0201002]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT-17R47]
- Application and Basic Research of Jilin Province [20190201276JC]
- STIRT-JLU [2017TD-07]
In this paper, YSZ-based mixed potential SO2 sensor with ZnGa2O4 and Pt electrodes was developed and the effect of the continuous testing and aging process on the sensing characteristics was discussed. The results showed that with this process the response of the sensor to SO2 performed an opposite direction to that in the sensor's initial state. The reason might be that the PtS produced at the Pt electrode increased the electrochemical catalytic activity of the Pt electrode, leading to the mixed potential of the Pt electrode higher than that of the ZnGa2O4 electrode. XPS and EDS results proved that a lot of Pt2+ and S2- were produced at Pt electrode after this process. Moreover, vulcanized sensor also performed similar sensing properties to the above aging sensor, which indicated that the produced PtS should be the reason that the sensor performed reverse deflection on sensing properties. In addition, the sensor after sulfuration can detect 0.05-500 ppm SO2 with the sensitivity being 5 mV/decade to 0.05-1 ppm and 41 mV/decade to 1-500 ppm. The sensor also had a reliable stability during the continuous measurement.
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