期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 309, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.127768
关键词
HCHO sensor; Pyrochlore solid electrolyte; Ca-doped Gd2Zr2O7; Rod-shaped ZnO
资金
- National Nature Science Foundation of China [61831011, 61803171, 61327804, 61520106003, 61722305, 61833006]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National Key Research and Development Program of China [2016YFC0207300, 2016YFC0201002]
- Application and Basic Research of Jilin Province [20130102010 JC]
- Young Elite Scientists Sponsorship Program [CAST2018QN RC001]
- Program for JLU Science and Technology Innovative Research Team [JLUSTIRT 2017TD-07]
- China Postdoctoral Science Foundation [2018M630322, 2019T120239]
- Jilin Provincial Science and Technology Development Program [20190103155JH]
- Jilin Provincial Education Department Science and Technology Project [JJKH20190114KJ]
- Fundamental Research Funds for the Central Universities
Solid state electrolyte type formaldehyde (HCHO) gas sensors based on a novel pyrochlore structure Gd2Zr2O7 solid electrolyte coupled with rod-shaped ZnO sensing electrode (SE) were initially designed and fabricated in this paper. The incorporation of alkaline-earth metal Ca can significantly improve sensing performance of the Gd2Zr2O7 based sensors to HCHO. The response value (Delta V) of the sensors based on Gd(2-x)CaxZr(2)O(7) (x = 0, 0.02, 0.05 and 0.1) varied approximately linear with the logarithm of HCHO concentration in the range of 1-100 ppm at 600 degrees C, with sensitivities of -25, -30, -15 and -5 mV/decade, respectively. The optimal sensor based on Gd1.98Ca0.02Zr2O7 (GCZ(0.02)) exhibited the excellent sensing characteristics with maximum response value (-61.3 mV) and extremely short response time (3 s) to 100 ppm HCHO. In addition, the GCZ(0.02) sensor also showed good selectivity and stability within 20-day period of continuous high-temperature aging under high-humidity condition. Conclusively, the sensing behavior and mechanism based on mixed potential were investigated and demonstrated by the mearsurement of the polarization curves.
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