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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Impact of Pt additives on the surface reactions between SnO2, water vapour, CO and H2; an operando investigation
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Impact of Pt additives on the surface reactions between SnO2, water vapour, CO and H2; an operando investigation

机译：PT添加剂对SnO2，水蒸气，CO和H2之间的表面反应的影响; 一个操作扬说调查

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摘要

The impact of Pt doping on the surface reactions between tin dioxide, water vapour, CO and H2 was investigated by a combination of simultaneously performed operando DRIFT (Diffuse Reflectance Infrared Fourier Transform) spectroscopy, DC resistance measurements and analysis of the reaction products by using a MS (Mass Spectrometer). Both undoped and Pt doped tin dioxide sensors were exposed to different test gases in synthetic air or in N2 backgrounds. The approach made it possible to identify the differences between the two materials with respect to their surface chemistry and their impact on the gas sensing performance. The main finding is that the presence of Pt changes the reaction partners' nature for water vapour and H2 on the one hand, and CO on the other hand when the sensors are operated in air. In this way the cross interference effect of humidity, which is responsible for the loss of CO sensing performance for the sensors based on undoped SnO2, is reversed.
机译：通过使用A通过同时进行的Operando漂移（漫反射率红外傅里叶变换）光谱，直流电阻测量和反应产物的分析，通过使用A对二氧化锡，水蒸气，CO和H2进行二氧化锡，水蒸气，CO和H2之间的表面反应的影响。 MS（质谱仪）。 两个未掺杂的和掺杂的锡二氧化锡传感器都暴露于合成空气或N2背景中的不同试验气体。 该方法使得可以识别两种材料相对于其表面化学的差异及其对气体传感性能的影响。 主要发现是PT的存在改变了一方面的水蒸气和H2的反应伙伴的性质，另一方面，当传感器在空气中运行时，同一股份。 以这种方式，湿度的交叉干扰效果负责基于未掺杂的SnO2的传感器对传感器的CO感测性能的负责。

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    Katharina Grossmann; Susanne Wicker; Udo Weimar;

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    Tuebingen University Faculty of Science Department of Chemistry Institute of Physical and Theoretical Chemistry Auf der Morgenstelle 15 72076 Tubingen Germany.;

    Tuebingen University Faculty of Science Department of Chemistry Institute of Physical and Theoretical Chemistry Auf der Morgenstelle 15 72076 Tubingen Germany.;

    Tuebingen University Faculty of Science Department of Chemistry Institute of Physical and Theoretical Chemistry Auf der Morgenstelle 15 72076 Tubingen Germany.;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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