Insight into the effect of the continuous testing and aging on the SO2 sensing characteristics of a YSZ (Yttria-stabilized Zirconia)-based sensor utilizing ZnGa2O4 and Pt electrodes

Xidong Hao; Qi Lu; Yuxi Zhang; Weijia Li; Yueying Zhang; Tong Liu; Xishuang Liang; Fangmeng Liu; Xu Yan; Yuan Gao; Lang Wang; Geyu Lu

doi:10.1016/j.jhazmat.2019.121772

Insight into the effect of the continuous testing and aging on the SO₂ sensing characteristics of a YSZ (Yttria-stabilized Zirconia)-based sensor utilizing ZnGa₂O₄ and Pt electrodes

J Hazard Mater. 2020 Apr 15:388:121772. doi: 10.1016/j.jhazmat.2019.121772. Epub 2019 Nov 27.

Authors

Xidong Hao¹, Qi Lu¹, Yuxi Zhang¹, Weijia Li¹, Yueying Zhang¹, Tong Liu¹, Xishuang Liang², Fangmeng Liu¹, Xu Yan¹, Yuan Gao¹, Lang Wang³, Geyu Lu⁴

Affiliations

¹ State Key Laboratory on Integrated Optoelectronics, Key Laboratory of gas sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.
² State Key Laboratory on Integrated Optoelectronics, Key Laboratory of gas sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China. Electronic address: liangxs@jlu.edu.cn.
³ School of Information Science and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, China.
⁴ State Key Laboratory on Integrated Optoelectronics, Key Laboratory of gas sensors, Jilin Province, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China. Electronic address: lugy@jlu.Edu.cn.

PMID: 31813685
DOI: 10.1016/j.jhazmat.2019.121772

Abstract

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 S^2- 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.

Keywords: Mixed-potential; Pt; PtS; SO(2); Yttria-stabilized Zirconia.

Publication types

Research Support, Non-U.S. Gov't