LaNiTiO3-SE-based stabilized zirconium oxide mixed potentiometric SO2 gas sensor

In this paper, a mixed potential gas sensor based on YSZ solid electrolyte and LaNiTiO3 sensing electrode was produced. The perovskite-type oxide LaNiTiO3 was synthesized by the sol-gel method as a sensitive electrode, which was intended to detect the low-level concentration of SO2 in the environment. After the aging process and continuous testing, it was found that the LaNiTiO3-SE sensor had the best response value of-27.5 mV to 5 ppm SO2 at 510 & DEG;C, at this temperature, as low as 50 ppb SO2 still had a response of-1mV. Meanwhile, when the sensor was tested at 510 & DEG;C, it was found that the response value of the sensor showed a piecewise linear relationship with the logarithm of SO2 concentration, with a sensitivity of-4 mV/decade for 0.05-1 ppm SO2 and-40mV/decade for 1-100 ppm SO2. In addition, the sensor also showed good selectivity, and the response to interference gases could be ignored such as NO2, CO, CH4, NH3, H-2, ethanol, and formaldehyde. At the same time, the sensor also shows good repeatability and stability, being still relatively stable after two weeks of continuous operation at high-temperature.

Automated summary

In this study, a mixed potential gas sensor based on YSZ solid electrolyte and LaNiTiO3 sensing electrode was developed. The sensor exhibited high sensitivity to low-level concentration of SO2, and demonstrated good selectivity, repeatability, and stability.