Baier Dominik, Priamushko Tatiana, Weinberger Christian, Kleitz Freddy, Tiemann Michael
Faculty of Science, Department of Chemistry, Paderborn University, Paderborn 33098, Germany.
Faculty of Chemistry, Department of Inorganic Chemistry - Functional Materials, University of Vienna, Vienna 1090, Austria.
ACS Sens. 2023 Apr 28;8(4):1616-1623. doi: 10.1021/acssensors.2c02739. Epub 2023 Apr 5.
The production of hydrogen and the utilization of biomass for sustainable concepts of energy conversion and storage require gas sensors that discriminate between hydrogen (H) and carbon monoxide (CO). Mesoporous copper-ceria (Cu-CeO) materials with large specific surface areas and uniform porosity are prepared by nanocasting, and their textural properties are characterized by N physisorption, powder XRD, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation states of copper (Cu, Cu) and cerium (Ce, Ce) are investigated by XPS. The materials are used as resistive gas sensors for H and CO. The sensors show a stronger response to CO than to H and low cross-sensitivity to humidity. Copper turns out to be a necessary component; copper-free ceria materials prepared by the same method show only poor sensing performance. By measuring both gases (CO and H) simultaneously, it is shown that this behavior can be utilized for selective sensing of CO in the presence of H.
对于可持续的能量转换和存储概念而言，氢气的生产以及生物质的利用需要能够区分氢气（H）和一氧化碳（CO）的气体传感器。通过纳米铸造制备具有大比表面积和均匀孔隙率的介孔铜铈（Cu-CeO）材料，并通过N物理吸附、粉末XRD、扫描电子显微镜、透射电子显微镜和能量色散X射线光谱对其结构性质进行表征。通过XPS研究铜（Cu、Cu）和铈（Ce、Ce）的氧化态。这些材料用作H和CO的电阻式气体传感器。该传感器对CO的响应比对H更强，并且对湿度的交叉敏感性较低。结果表明铜是必要成分；通过相同方法制备的无铜二氧化铈材料仅表现出较差的传感性能。通过同时测量两种气体（CO和H），结果表明这种行为可用于在存在H的情况下选择性传感CO。
