Au_(core)@Pt_(shell)/GC电极上甲醇解离中间体CO氧化的SERS研究

本文采用共焦显微拉曼系统对不同介质中甲醇解离中间体CO在Aucore@Ptshell/GC电极上的氧化行为进行了研究。结果显示,不论在酸性、中性还是碱性介质中,甲醇均能在Aucore@Ptshell/GC电极上自发氧化解离出强吸附中间体CO;较低电位下,CO在酸性和中性介质中以线性吸附为主,碱性介质中则以桥式吸附为主。此研究表明,电极在中性及碱性介质中对甲醇解离中间体CO的电氧化比在酸性介质中有更好的催化活性,原位表面增强拉曼光谱技术有望拓展成为研究电催化反应的有效工具。

Surface-Enhanced Raman Spectroscopy Investigation of CO Intermediated from Methanol Oxidation on Aucore@Ptshell Nanoparticles Supported on GC Electrode

Surfaced-enhanced Raman spectroscopy was utilized to investigate the electro-oxidation behavior of CO intermediated from methanol oxidation adsorbed on Aucore@Ptshell nanoparticles supported on GC electrode in different media.Results showed that methanol could dissociate spontaneously to produce strongly adsorbed intermediate,CO,in acidic,neutral,and alkaline media on Aucore@Ptshell nanoparticles supported on GC electrode.At the lower potential,CO in mode of bridged adsorption was dominative in the alkaline media,while linear adsorption in the acidic or neutral media.The study demonstrates that the electrode exhibited better electro-catalytic properties for the oxidation of CO in neutral and alkaline media,and in-situ Surfaced-enhanced Raman spectroscopy(SERS) technique could be developed as a useful tool for investigating electro-oxidation reaction process.