Ethanol sensor using gadolinia-doped ceria solid electrolyte and double perovskite structure sensing material

Mixed potential gadolinia-doped ceria (GDC)-based gas sensors using a double perovskite composite oxide (Sr2NiMoO6) were fabricated to detect ethanol. The influence of the sensing materials sintered at different temperatures on the sensor properties was investigated. The results showed that Sr2NiMoO6 annealed at 1000 degrees C was the most suitable sensing material for detecting ethanol due to its suitable micromorphology and high electrochemical catalytic activity. The sensor attached with Sr2NiMoO6-1000 degrees C displayed the highest sensitivity to 1-200 ppm ethanol at 550 degrees C, the response value Delta V was piecewise linearly with the logarithm of ethanol concentration, and the slopes were -8 and -51.3 mV/decade in the ranges of 1-10 ppm and 10-200 ppm ethanol, respectively. Moreover, the stability and sensing mechanism of the sensor were also investigated.

Automated summary

Gas sensors based on mixed potential gadolinia-doped ceria (GDC) using a double perovskite composite oxide (Sr2NiMoO6) were fabricated to detect ethanol, with the material annealed at 1000 degrees C showing the highest sensitivity in the range of 1-200 ppm. The sensor response value Delta V was piecewise linear with the logarithm of ethanol concentration, with the slopes of -8 and -51.3 mV/decade for 1-10 ppm and 10-200 ppm ethanol, respectively. Stability and sensing mechanism of the sensor were also investigated.