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首页> 外文期刊>Electrocatalysis >Chemisorption-Isotherm Measurements at Electrode Surfaces by Quantitative High-Resolution Electron Energy Loss Spectroscopy
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Chemisorption-Isotherm Measurements at Electrode Surfaces by Quantitative High-Resolution Electron Energy Loss Spectroscopy

机译：定量高分辨率电子能量损失谱法测量电极表面的化学吸附等温线

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摘要

The chemisorption isotherm of benzoquinone at a well-defined Pd(100) surface was obtained by quantitative high-resolution electron energy loss spectroscopy (HREELS). Extraction of surface-coverage information from HREELS required the normalization of integrated peak intensities to compensate for differences in the backscattered electron flux brought about by the organic adlayer. A common procedure rests on a match of the elastic-peak heights, but it fails for organic adsorbates since those introduce surface roughness that result in a higher stream of inelastically scattered electrons. A more accurate method is based on the equalization of the incident electron beam currents. This is attained only when the background intensities integrated over a peak-free spectral region are set equal to one another. The HREELS-generated isotherm was compared with that acquired by thin-layer electrochemical measurements; excellent agreement was observed.
机译：通过定量高分辨率电子能量损失谱（HREELS）获得了在明确定义的Pd（100）表面上苯醌的化学吸附等温线。从HREELS中提取表面覆盖率信息需要对积分峰强度进行归一化，以补偿由有机附加层引起的反向散射电子通量的差异。常见的程序取决于弹性峰高的匹配，但是对于有机吸附剂而言却不可行，因为有机吸附剂会引入表面粗糙度，从而导致更高的非弹性散射电子流。一种更准确的方法是基于入射电子束电流的均衡。仅当将在无峰光谱区域上积分的背景强度设置为彼此相等时，才能实现此目的。将HREELS产生的等温线与通过薄层电化学测量获得的等温线进行了比较。观察到极好的一致性。

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