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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 dissociative adsorption and oxidation behavior of ethanol on Pt-Ru electrode were studied by electrochemical cyclic voltammetry and in-situ surface enhanced Raman spectroscopy. The surface of ethanol adsorbed on Pt-Ru electrode in acidic medium was obtained for the first time Raman spectrum.The experimental results show that ethanol can spontaneously dissociate strongly adsorbed CO on rough Pt and Pt-Ru electrodes, and the overpotential of CO oxidation of strong adsorbed intermediates on Pt-Ru electrode is higher than that of rough The Pt electrode has been reduced by about 140 mV. It was initially confirmed that the oxidation of ethanol on the Pt-Ru electrode in acidic media obeys the dual-pathway mechanism. The results of this study demonstrate that surface-enhanced Raman spectroscopy can be extended to practical electrocatalytic systems.