Abstract
Detection and prevention of some hazardous gas pollutants has always been a challenging problem. SO2, as a typical toxic and dangerous gas, is extremely difficult to be monitored stably because of its toxicity to gas detecting equipment. In this work, we report a high-performance YSZ-based mixed potential sensor to realize continuously on-line detection of SO2. In view of shortcomings of high temperature SO2 sensors such as poor stability, slow response and recovery rate and easy deterioration, Pd/Al2O3 catalyst was mixed thoroughly with Mn/Ce composite oxide and sintered to construct sensing electrode and an improved scheme combining high-temperature pulse and catalyst was proposed to decompose sulfate deposit and improve recovery characteristics. EDS and XPS measurements were used to verify the reason for improvement of SO2 sensing performance. Through the strategy proposed in this study, recovery time of the high temperature SO2 sensor to 5 ppm SO2 was reduced from 665 s to 73 s, indicating its fast-detecting ability. The detection range is 0−20 ppm (resolution ratio:1 ppm), meeting SO2 detection requirement. Moreover, stability of SO2 sensor during 10 days was significantly enhanced. This SO2 sensor is suitable for application in hazardous gas detection field due to its miniaturized, cost-effective, satisfying stability and selectivity, and fast response and recovery features.
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