【摘要】 用化学还原法合成了Aucore@Ptshell纳米粒子,并用扫描电子显微镜(SEM)及X射线衍射(XRD)等技术对纳米粒子进行表征;采用电化学原位表面增强拉曼光谱(SERS)技术对甲酸的电催化氧化过程进行了研究,成功地获得了甲酸在Aucore@Ptshell/Pt电极上解离吸附的原位SERS.结果显示,在开路电位时,甲酸能在Aucore@Ptshell/Pt电极表面自发氧化,解离生成强吸附中间体COad和弱吸附中间体HCOOad,在电位为+0.10V时检测到氧化产物CO2的谱峰.研究结果表明,Aucore@Ptshell/Pt电极对甲酸的氧化具有较高的催化活性和较强的SERS效应,甲酸在Aucore@Ptshell/Pt电极上的电催化氧化过程遵循双途径机理.更多还原

【Abstract】 Aucore@Ptshell nanoparticles were synthesized by chemical reduction method. The samples were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). In-situ surfac-enhanced Raman scattering (in-situ SERS) spectroscopy combined with cyclic voltammetry was utilized to investigate the electro-oxidation behavior of formic acid adsorbed on Aucore@Ptshell nanoparticles coated on platinum electrode, and SERS spectra with high quality were acquired. Results showed that the intermediates COad and HCOOad, the dissociated products of HCOOH, were produced at open circuit potential. As the potential moved to positive, the first oxidation wave for CO2 was observed at +0.10 V. The study demonstrated that the electrode prepared by Aucore@Ptshell nanoparticles coated on platinum substrate exhibited good electro-catalytic properties and SERS activity for the oxidation of HCOOH, and the electro-oxidation proceeds of formic acid via"dual path"mechanism.更多还原