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| Impedance type NO2 sensor based on Fe-doped SrCoO3 sensitive electrode |
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Received:March 25, 2024
Revised:April 22, 2024
Accepted:May 06, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:impedance type; NO2 sensor; SrCoO3; Fe doping |
| Author | Institution |
| SHI Yingwei |
College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Photocatalytic Materials |
| LIU Yongguang |
College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Photocatalytic Materials |
| WANG Ling |
College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Photocatalytic Materials |
| MENG Weiwei |
College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Photocatalytic Materials |
| LI Yuehua |
College of Chemical Engineering,North China University of Science and Technology,Hebei Provincial Key Laboratory of Environmental Photocatalytic Materials |
| DAI Lei |
College of Materials Science and Engineering, North China University of Science and Technology |
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| Abstract: |
| An impedance-type NO2 sensor was prepared using Fe-doped SrCoO as the sensitive electrode (SE) and yttria-stabilised zirconia (YSZ) as the electrolyte. The experimental results show that the sensor based on SrCo0.85Fe0.15O3-SE has good responsiveness to different concentrations of NO2 gas at 550 ℃. The sensitivity of the sensor was significantly impr oved by doping Fe element. The response value increased significantly under the atmosphere of high NO2 concentration and did not decrease significantly under the atmosphere of low NO2 concentration. The results showed that, considering the factors of response value and response rate, the sensor based on SrCo0.85Fe0.15O3-SE has the best sensitive performance, the optimum working temperature is 550 ℃, and the maximum response value is 27.1°, which is 1.96 times that of the sensor based on SrCoO3-SE. In addition, the SrCo0.85Fe0.15O3-SE sensor was able to maintain good selectivity under the interference of gases such as CH4, CO2, H2, NH3 and NO. |
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