Potential Routes and Mitigation Strategies for Contamination in Interfacial Specific Infrared Spectroelectrochemical Studies
Potential Routes and Mitigation Strategies for Contamination in Interfacial Specific Infrared Spectroelectrochemical Studies
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DOI：
10.1021/acs.jpcc.8b05634
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发表时间：
2018-11-01
影响因子：
3.7
通讯作者：
Xu, Bingjun
中科院分区：
文献类型：
--
作者：
Dunwell, Marco;Yang, Xuan;Xu, Bingjun
衰减全反射表面增强红外吸收光谱（ATR-SEIRAS）是探测电化学界面的有力工具，然而，在报道的光谱观测的不一致性持续存在。在这项工作中，我们确定在ATR-SEIRAS中使用CO作为探针分子的潜在污染源，通过改变电解质纯度，反电极（CE），和阳极/阴极电解液分离器。我们发现，在干净的实验中，只有一个线性键合CO附近2050-2100 cm（-1），而使用低纯度电解质和Pt CE导致额外的带附近1800-1950和1920-2020 cm（-1），分别，这通常被分配到桥键CO在以前的文献。这些观察结果突出了ATR-SEIRAS的极端灵敏度以及避免导致额外光谱特征的污染物的重要性。
Attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) is a powerful tool for probing the electrochemical interface; however, inconsistencies in reported spectroscopic observations persist. In this work, we identify potential sources of contamination in ATR-SEIRAS using CO as a probe molecule by varying the electrolyte purity, counter electrode (CE), and anolyte/catholyte separator. We show that only a linearly bound CO near 2050-2100 cm(-1) is observed in clean experiments, whereas the use of low-purity electrolytes and Pt CEs leads to additional bands near 1800-1950 and 1920-2020 cm(-1), respectively, which are commonly assigned to bridge-bonded CO in the previous literature. These observations highlight the extreme sensitivity of ATR-SEIRAS and the importance of avoiding contaminants which lead to additional spectroscopic features.