On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy
On the occurrence of competitive adsorption at the platinum-acetonitrile interface by using surface-enhanced Raman spectroscopy
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DOI：
10.1021/jp027834j
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发表时间：
2003-06
影响因子：
3.3
通讯作者：
P. Cao;Yu-hua Sun;R. Gu
中科院分区：
文献类型：
--
作者：
P. Cao;Yu-hua Sun;R. Gu
在碘离子、锂离子、水和吡啶存在下，分析了铂电极-乙腈界面的表面增强拉曼散射（Sers）随外加电位的变化。结果发现，典型的拉曼带的氰化物物种的解离溶剂乙腈吸附到高度粗糙的铂电极表面上是可检测的所有的系统进行了研究。然而，乙腈的解离反应的起始电位不同的四个系统。我们假设上述四种物质与溶剂乙腈分子之间可能存在竞争吸附，特别是在Pt表面的解离反应活性位点处。因此，这种竞争性吸附显著抑制了乙腈的分解反应。这些吸附物与Pt的相互作用被假定为吡啶> I- >水和Li+的顺序减弱的基础上的不同的负位移的观察...
Surface-enhanced Raman scattering (SERS) from the platinum electrode−acetonitrile interface in the presence of iodide, the lithium cation, water, and pyridine was analyzed as a function of applied potential. It was found that the typical Raman band of cyanide species by the dissociation of the solvent acetonitrile upon adsorption onto highly roughened platinum electrode surfaces was detectable for all of the systems that were studied. However, the onset potential of the dissociation reaction of acetontrile differed for the four systems. We assume that competitive adsorption may exist between each of the above four species and the solvent acetonitrile molecule, especially at the dissociation reaction−active sites of the Pt surface. This competitive adsorption therefore significantly inhibits the decomposition reaction of acetonitrile. The interactions of these adsorbates with Pt are assumed to weaken in the sequence pyridine > I- > water ≈ Li+ on the basis of the observations of different negative shifts o...