物理化学学报 >> 2005, Vol. 21 >> Issue (01): 74-78.doi: 10.3866/PKU.WHXB20050115

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核-壳结构Au-Pt纳米粒子的光谱表征和电催化性能

田娜;陈卫;孙世刚   

  1. 厦门大学化学系，固体表面物理化学国家重点实验室，厦门　361005
  • 收稿日期:2004-06-22 修回日期:2004-09-20 发布日期:2005-01-15
  • 通讯作者: 孙世刚 E-mail:sgsun@xmu.edu.cn

Spectroscopic Characterization and Electrocatalytic Properties of Core-Shell Au-Pt Nanoparticles

TIAN Na;CHEN Wei;SUN Shi-Gang   

  1. State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Xiamen University, Xiamen　361005
  • Received:2004-06-22 Revised:2004-09-20 Published:2005-01-15
  • Contact: SUN Shi-Gang E-mail:sgsun@xmu.edu.cn

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摘要： 用化学还原法合成了核-壳结构Au-Pt纳米粒子.紫外可见光谱(UV-Vis)、电化学循环伏安(CV)和透射电子显微镜(TEM)表征结果指出，所合成的核-壳结构Au-Pt纳米粒子为球形，平均直径为27 nm.以CO为分子探针，结合透射红外光谱研究，发现CO以孪生吸附态形式(COT)吸附在Au-Pt纳米粒子上，在2110 cm－1和2063 cm－1附近分别给出对称和反对称红外吸收峰. CV研究结果指出Au-Pt/GC电极对CO的氧化有较高的催化活性，起始氧化电位较本体Pt电极提前了0.45 V，峰电位提前了0.11 V.

关键词: 核-壳结构, 金铂纳米粒子, 孪生态CO, CO氧化

Abstract: Core-shell Au-Pt nanoparticles were synthesized by chemical reduction method. The mean diameter of the nanoparticles was determined to be 27 nm by transmission electron microscope (TEM). The prepared nanoparticles were characterized by ultraviolet-visible (UV-Vis) and infrared transmission spectroscopy. The disappearance of the characteristic peak near 520 nm of Au nanoparticles in UV-Vis spectroscopy confirmed the formation of the core-shell structure. Using infrared transmission spectroscopy, the geminal CO adsorbates that yielded a doublet IR band at around 2110 cm－1 and 2063 cm－1 on core-shell Au-Pt nanoparticles were detected for the first time. The core-shell Au-Pt nanoparticles supported on GC (glassy carbon) substrate as electrode exhibited good electrocatalytic properties for the oxidation of adsorbed CO (COad) species. The onset and peak potentials of COad oxidation were negatively shifted 0.45 and 0.11 V, respectively, in referring to the values measured on a bulk Pt electrode.

Key words: Core-shell, Au-Pt nanoparticles, Geminal CO, CO oxidation