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Sensitivity and selectivity of (Au, Pt, Pd)-loaded and (In, Fe)-doped SnO2 sensors for H2 and CO detection

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Abstract

(Au, Pt, Pd)-loaded and (In, Fe)-doped SnO2 are synthesized by a sol–gel method. The composition, morphology and electrochemical property of the materials were characterized by XRD, SEM and electrochemical workstation, respectively. The results show that Au, Pd loading and In, Fe doping prefer to enhance the selectivity to CO against H2, while Pt loading can enhance the selectivity to H2 against CO. Furthermore, 1 mol% Pt-loaded SnO2 sensor has preferable selectivity to H2 against CO when Pt loading amount is changed. The response time of the Pt-loaded SnO2 sensor to 5,000 ppm H2 is 5 s at 400 °C, which is much shorter than that of pure SnO2 sensor. Meanwhile the effect of operating temperature and Pt loading on n value (the slope of logarithm of response versus logarithm of gas concentration) is studied. The Pt-loaded SnO2 sensor can detect H2 down to 1 ppm. These results show that the Pt-loaded SnO2 sensor is a good candidate for practical H2 sensors.

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Acknowledgments

The financial support provided by the National Natural Science Foundation of China (Nos. 50974012 and 51374017) and State Key Laboratory of Advanced Metallurgy are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy and School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xi-Tao Yin & Xing-Min Guo

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  1. Xi-Tao Yin
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  2. Xing-Min Guo
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Correspondence to Xing-Min Guo.

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Yin, XT., Guo, XM. Sensitivity and selectivity of (Au, Pt, Pd)-loaded and (In, Fe)-doped SnO2 sensors for H2 and CO detection. J Mater Sci: Mater Electron 25, 4960–4966 (2014). https://doi.org/10.1007/s10854-014-2258-7

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  • DOI: https://doi.org/10.1007/s10854-014-2258-7

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