Surface Photocatalysis-TPD Spectrometer for Photochemical Kinetics
Surface Photocatalysis-TPD Spectrometer for Photochemical Kinetics
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DOI：
10.1088/1674-0068/25/05/507-512
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发表时间：
2012-10
影响因子：
1
通讯作者：
Zefeng Ren;Qing Guo;Chenbiao Xu;Wenshao Yang;C. Xiao;D. Dai;Xueming Yang
中科院分区：
文献类型：
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作者：
Zefeng Ren;Qing Guo;Chenbiao Xu;Wenshao Yang;C. Xiao;D. Dai;Xueming Yang
已经构建了用于研究具有各种信号晶体表面的光催化过程的动力学和机制的表面光催化TPD设备。通过使用多个超高真空泵获得电离区域中极高的真空（〜0.2 NPA）。与其他人先前构建的类似仪器相比，电离区域中的H2，CH4背景可以减少大约两个数量级，并且电离区域中的其他残留气体可以减少约一定数量的数量级。因此，温度编程的解吸（TPD）和飞行时间（TOF）光谱的信噪比大大增强，从而更加容易地对表面上的光催化过程进行了实验研究。在这项工作中，我们详细描述了新的设备，并通过使用TPD和TOF方法对照片诱导的TIO2（110）上的Tio2（110）上的氧空位缺陷进行了一些初步研究。初步结果表明，该设备是研究光化学过程动力学和机制的强大工具。
A surface photocatalysis-TPD apparatus devoted to studying kinetics and mechanism of photocatalytic processes with various signal crystal surfaces has been constructed. Extremely high vacuum (~0.2 nPa) in the ionization region is obtained by using multiple ultrahigh vacuum pumps. Compared with similar instruments built previously by others, the H2, CH4 background in the ionization region can be reduced by about two orders of magnitude, and other residual gases in the ionization region can be reduced by about an order of magnitude. Therefore, the signal-to-noise ratio for the temperature programmed desorption (TPD) and time of flight (TOF) spectra is substantially enhanced, making experimental studies of photocatalytic processes on surfaces much easier. In this work, we describe the new apparatus in detail and present some preliminary studies on the photo-induced oxygen vacancy defects on TiO2(110) at 266 nm by using the TPD and TOF methods. Preliminary results suggest that the apparatus is a powerful tool for studying kinetics and mechanism of photochemical processes.