Detection and prevention of some hazardous gas pollutants has always been a challenging problem. SO₂, as atypical toxic and dangerous gas, is extremely difficult to be monitored stably because of its toxicity to gasdetecting equipment. In this work, we report a high-performance YSZ-based mixed potential sensor to realizecontinuously on-line detection of SO₂. In view of shortcomings of high temperature SO₂sensors such as poorstability, slow response and recovery rate and easy deterioration, Pd/Al₂O₃catalyst was mixed thoroughly withMn/Ce composite oxide and sintered to construct sensing electrode and an improved scheme combining hightemperature 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 SO₂sensing performance.Through the strategy proposed in this study, recovery time of the high temperature SO₂sensor to 5 ppm SO₂wasreduced from 665 s to 73 s, indicating its fast-detecting ability. The detection range is 0-20 ppm (resolutionratio:1 ppm), meeting SO₂detection requirement. Moreover, stability of SO₂sensor during 10 days was significantly enhanced. This SO₂sensor 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.

原文链接：https://www.sciencedirect.com/science/article/pii/S0925400523012613