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Acetylene- and Ethylene-Sensing Mechanism for LaFeO3-Based Gas Sensors: Operando Insights
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.jpcc.0c01052 Abdulaziz. A. Alharbi 1, 2 , A. Sackmann 1 , U. Weimar 1 , N. Bârsan 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-03-24 , DOI: 10.1021/acs.jpcc.0c01052 Abdulaziz. A. Alharbi 1, 2 , A. Sackmann 1 , U. Weimar 1 , N. Bârsan 1
Affiliation
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We recently demonstrated acetylene and ethylene selectivity for LaFeO3 (LFO)-based gas sensors. To understand the origin of sensing, we combined catalytic conversion measurements with simultaneously performed operando diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and DC resistance measurements. We applied our operando investigation technique to the relevant analytes, CO2, C2H4, and C2H2, in order to identify the type and role of different adsorbates. DRIFT spectra revealed that at 150 °C, the reaction with both acetylene and ethylene resulted in surface formate species; at higher temperatures, this was the case only for acetylene. Accordingly, LFO responds to both gases at 150 °C but only to acetylene at 250 °C. Finally, we could identify the mechanism by which the formate species are responsible for the sensor response and the essential role played by Pt electrodes in the detection of ethylene and the temperature-dependent selectivity.
中文翻译：
基于LaFeO 3的气体传感器的乙炔和乙烯传感机制：Operando Insights
我们最近展示了基于LaFeO 3（LFO）的气体传感器对乙炔和乙烯的选择性。为了了解传感的起源，我们将催化转化测量与同时执行的操作扩散反射红外傅里叶变换（DRIFT）光谱和直流电阻测量相结合。我们将操作调查技术应用于相关分析物CO 2，C 2 H 4和C 2 H 2，以便确定不同吸附物的类型和作用。DRIFT光谱表明，在150℃下，与乙炔和乙烯的反应产生了表面甲酸酯类。在较高温度下，仅乙炔就是这种情况。因此，LFO在150°C下对两种气体都有反应，而在250°C下仅对乙炔有反应。最后，我们可以确定甲酸类物质负责传感器响应的机制，以及Pt电极在检测乙烯和温度依赖性选择性中所起的重要作用。
更新日期：2020-03-24
中文翻译：
基于LaFeO 3的气体传感器的乙炔和乙烯传感机制：Operando Insights
我们最近展示了基于LaFeO 3（LFO）的气体传感器对乙炔和乙烯的选择性。为了了解传感的起源，我们将催化转化测量与同时执行的操作扩散反射红外傅里叶变换（DRIFT）光谱和直流电阻测量相结合。我们将操作调查技术应用于相关分析物CO 2，C 2 H 4和C 2 H 2，以便确定不同吸附物的类型和作用。DRIFT光谱表明，在150℃下，与乙炔和乙烯的反应产生了表面甲酸酯类。在较高温度下，仅乙炔就是这种情况。因此，LFO在150°C下对两种气体都有反应，而在250°C下仅对乙炔有反应。最后，我们可以确定甲酸类物质负责传感器响应的机制，以及Pt电极在检测乙烯和温度依赖性选择性中所起的重要作用。
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