非水乙腈体系中CO在铂电极表面吸附的SERS研究  

Surface-enhanced Raman Spectrum Studies of CO Adsorbed on Platinum Electrodes in Non-aqueous Acetonitrile System

作　　者：孙玉华[1] 曹佩根[1] 郑军伟[1] 顾仁敖[1] 姚建林[2] 任斌[2] 田中群[2] 

机构地区：[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

出　　处：《光谱学与光谱分析》2002年第1期33-35,共3页Spectroscopy and Spectral Analysis

基　　金：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LabRamⅠ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CH3In 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 obseved, 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(O-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.

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 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O646.5[理学—物理化学]