Dynamic blocking by CO of hydrogen transport across Pd70Au30(110) surfaces
Dynamic blocking by CO of hydrogen transport across Pd70Au30(110) surfaces
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CO 对 Pd70Au30(110) 表面氢传输的动态阻断
DOI：
10.1021/acs.jpcc.6b10965
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发表时间：
2017
影响因子：
3.7
通讯作者：
K. Fukutani
中科院分区：
文献类型：
--
作者：
S. Ogura;K. Fukutani
CO吸附影响氢在吸氢材料表面的传输。在Pd_（70）Au_（30）（110）上，CO对吸附氢的脱附位置有阻碍作用。然而，详细的CO吸附网站，因此，阻塞机制尚未澄清。本文采用反射-吸收红外光谱（RAIRS）研究了CO在Pd_（70）Au_（30）（110）表面的吸附结构。我们证明CO吸附结构取决于CO覆盖度和样品温度。我们还进行了热脱附光谱（TDS）模拟的RAIRS结果的基础上，并澄清了CO阻塞的动力学机制，CO网站转移从Pd的顶部的Pd-Pd桥网站提高阻塞效率。这些发现将有助于理解和控制氢在Pd-Au合金和Pd相关表面上的传输。
CO adsorption affects hydrogen transport across surfaces of hydrogen-absorbing materials. On Pd70Au30(110), CO was found to block the desorption sites for absorbed hydrogen. However, the detailed CO adsorption site and hence the blocking mechanism have not been clarified yet. In this study, we investigated the CO adsorption structure on Pd70Au30(110) by using reflection–absorption infrared spectroscopy (RAIRS). We demonstrate that the CO adsorption structure depends on the CO coverage and sample temperature. We also performed thermal desorption spectroscopy (TDS) simulations on the basis of the RAIRS results and clarified the dynamical mechanism of the CO blocking where the CO site transfer from the Pd on-top to the Pd–Pd bridge sites enhances the blocking efficiency. These discoveries would lead to understanding and controlling the hydrogen transport across the Pd–Au alloy and Pd-related surfaces.