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非水乙腈体系中CO在铂电极表面吸附的SERS研究
引用本文:孙玉华,曹佩根,郑军伟,顾仁敖,姚建林,任斌,田中群.非水乙腈体系中CO在铂电极表面吸附的SERS研究[J].光谱学与光谱分析,2002,22(1):33-35.
作者姓名:孙玉华  曹佩根  郑军伟  顾仁敖  姚建林  任斌  田中群
作者单位:1. 苏州大学化学系,江苏,苏州,215006
2. 厦门大学固体表面物理化学国家重点实验室,化学系,福建,厦门,361005
基金项目:国家自然科学基金 (2 98730 33)资助项目
摘    要:在非水乙腈体系中,借助LabRam Ⅰ型共焦显微拉曼系统,尝试用表面增强拉曼光谱(SERS)对作为燃料电池中毒化中间体的CO在过渡金属铂电极表面的催化氧化进行了研究,并考察了在电极电位的变化过程中CO的催化氧化与周围环境分子的相互作用。不仅观察到CO在铂金属表面的吸附和氧化,还得到溶剂乙腈分子发生解离的表面增强拉曼光谱,并对CO和CH3CN分子在铂电极上的竞争吸附进行了分析。

关 键 词:非水体系  表面增强拉曼光谱  SERS  乙腈  铂电极  一氧化碳  表面吸附  燃料电池  毒化中间体  催化氧化
文章编号:1000-0593(2002)01-0033-03
修稿时间:2001年8月25日

Surface-enhanced Raman Spectrum studies of CO Adsorbed on Platinum Electrodes in Non-aqueous Acetonitrile System
SUN Yu-hua ,CAO Pei-gen ,ZHENG Jun-wei ,GU Ren-ao ,YAO Jian-lin ,REN Bin ,and TIAN Zhong-qun.Surface-enhanced Raman Spectrum studies of CO Adsorbed on Platinum Electrodes in Non-aqueous Acetonitrile System[J].Spectroscopy and Spectral Analysis,2002,22(1):33-35.
Authors:SUN Yu-hua  CAO Pei-gen  ZHENG Jun-wei  GU Ren-ao  YAO Jian-lin  REN Bin  and TIAN Zhong-qun
Institution:Department of Chemistry, Suzhou University, Suzhou 215006, China.
Abstract:In the non-aqueous acetonitrile solution, recurring to the confocal Raman system, we studied the catalysis and oxidation of carbon monoxide on the surface of platinum electrode utilizing surface-enhanced Raman spectrum (SERS). As the movement of the potential, the process of the catalysis and oxidation interacted with the surrounding molecular. In the present paper, the catalysis and oxidation of carbon monoxide on the surface of platinum electrode was not clearly observed, but also the dissociation of acetonitrile was discovered simultaneously. Results show that acetonitrile decomposition occurs at a certain more negative potential by the appearance of the 2,133 cm-1 bands assigned to CN stretching modes. The bands observed at ca. 502 and 2,055 cm-1 are attributed to the Pt-CO(nu Pt-c) and intramolecular C-O(nu C-O) stretching vibration respectively, suggesting linearly adsorbed CO on platinum. The main product of COads oxidation is confirmed to be carbonate due to the existence of trace water in the double-layer region as a source of oxygen for the reaction.
Keywords:Non-aqueous system  Surface-enhanced Raman spectrum (SERS)  CO  Acetonitrile  Platinum electrode
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