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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;操作调查

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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:通过同时进行操作DRIFT(漫反射红外傅里叶变换)光谱,直流电阻测量和反应产物分析,研究了Pt掺杂对二氧化锡,水蒸气,CO和H2之间的表面反应的影响。 MS(质谱仪)。未掺杂和掺杂Pt的二氧化锡传感器都暴露于合成空气或N2背景下的不同测试气体中。该方法可以识别两种材料之间的表面化学差异以及它们对气体传感性能的影响。主要发现是,当传感器在空气中运行时,Pt的存在一方面改变了水蒸气和H2以及CO的反应伙伴的性质。以此方式,湿度的交叉干扰效应被逆转,该湿度造成了基于未掺杂的SnO2的传感器的CO感测性能的损失。

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