Abstract
The conventional CO electrochemical gas sensor uses aqueous H2SO4 solution as electrolyte, with inevitable problems, such as the drying and leakage of electrolyte. Thus, research on new alternative electrolytes is an attractive field in electrochemical gas sensors. In this paper, the application of a new fumed SiO2 gel electrolyte was studied in electrochemical gas sensors. The effects of fumed SiO2 and H2SO4 contents on the performance of the CO gas sensor were investigated. The results showed that the optimized composition of the SiO2 gel electrolyte was 4.8% SiO2, 38% H2SO4, and 0.005% polyvinyl alcohol (PVA). Compared with aqueous H2SO4, the gel electrolyte had better water retention ability. The signal current of the sensor was proportional to the CO concentration. The sensitivity to CO was 78.6 nA/ppm, and the response and recovery times were 31 and 38 s, respectively. The detection limit was 2 ppm. The linear range was from 2 to 500 ppm. The gel electrolyte CO sensor possesses equivalent performance to that with aqueous electrolyte.
Highlights
Toxic, flammable, explosive and polluting gases in the environment pose a huge threat to human life and property safety
Mahajan et al pointed out the disadvantages of different types of gas sensors [2]
The weight loss was due to the loss of water in the water in the gel electrolyte was reduced by 34% at 100 ◦ C
Summary
Flammable, explosive and polluting gases in the environment pose a huge threat to human life and property safety. The online monitoring of gases is necessary. Gas sensors are effective for realizing fast and real-time monitoring of these dangerous gases. The most widely used gas sensors on the market are semiconductor metal oxide, catalytic combustion, optical, and electrochemical sensors [1,2]. Korotcenkov comprehensively compared the advantages and disadvantages of various gas sensors [1]. Mahajan et al pointed out the disadvantages of different types of gas sensors [2]
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