铂钌电极上乙醇解离吸附与氧化行为的原位SERS研究  

Cyclic Voltammetry and Surface Enhanced Raman Spectroscopy of Dissociative Adsorption of Ethanol on Pt-Ru Electrodes

作　　者：张兵[1] 周海辉[1] 温祖标[1] 钟起玲[1] 黄芃[1] 杨熊元[1] 任斌[2] 田中群[2] 

机构地区：[1]江西师范大学化学化工学院,江西南昌330027 [2]固体表面国家重点实验室,厦门大学化学系福建厦门361005

出　　处：《电化学》2005年第3期289-293,共5页Journal of Electrochemistry

基　　金：教育部重点项目基金(地方02080);厦门大学固体表面物理化学国家重点实验室基金(9905)资助

摘　　要：应用电化学循环伏安法和原位表面增强拉曼光谱研究了乙醇在Pt-Ru电极上的解离吸附与氧化行为,首次获得了酸性介质中乙醇在Pt-Ru电极上解离吸附的表面拉曼光谱.实验表明:乙醇在粗糙铂和Pt-Ru电极上均能自发地解离出强吸附中间体CO,而且在Pt-Ru电极上,强吸附中间体CO氧化的过电位比在粗糙铂电极上降低了约140mV.初步证实酸性介质中乙醇在Pt-Ru电极上的氧化遵从双途径机理.本研究结果说明,表面增强拉曼光谱技术能拓展到有实用价值的电催化体系.The behaviors of dissociative adsorption of ethanol on roughened platinum-ruthenium electrode with high activity of SERS were studied by using cyclic voltammetry and in-situ surface enhanced Raman spectroscopy, surface enhanced Raman spectra of dissociative adsorption of ethanol on Pt electrode in acid was obtained for the first time. It is shown that Pt-Ru could lower the over-potantial of CO oxidation when compared to Pt electrode. The results show that ethanol in acid medium can be self-dissociated at Pt-Ru electrode to produce CO, which discourage the further oxidation of ethanol, some information of Pt-C and Pt-C-Pt stretching vibration from linearly adsorbed and bridged-adsorbed CO located in low frequency were examined respectively. Based on the data from in-situ SERS, it was proved that the oxidation of ethanol was processed via the parallel mechanism in this paper. SERS would be also extended to the electro-catalytic systems.

关 键 词：乙醇 解离吸附 Pt-Ru 表面增强拉曼光谱 

分 类 号：O646.54[理学—物理化学]