Surface structure of cubic nano-particle and application for fuel cell catalyst

开发形状可控纳米粒子的合成方法对设计新材料和高活性催化剂具有重要意义。用伏安和红外光谱研究了晶形可控银和铂颗粒的结构和电化学性质。立方银颗粒的表面结构和电化学性质与银(100)的相似。对铂颗粒的电化学分析表明，立方和立方八面体铂纳米颗粒的平面分别由阶梯和原子平台组成。红外光谱结果表明，吸附在边缘上的CO在比平面上更负的电位下被氧化。纳米粒子的边缘位置促进了CO的氧化。

The exploitation of synthesis method of shape-controlled nano-particle is important to design for new materials and higher active catalyst. The structural and electrochemical properties of shape-controlled Ag and Pt particle have studied using voltammetry and infrared spectroscopy. The surface structure and electrochemical properties of cubic Ag particles are similar to those of Ag(100). The electrochemical estimation of Pt particles suggests that the planes of the cubic and cuboctahedral Pt nano-particles are composed of step-terrace and atomically flat terraces, respectively. IR results indicate that on-top CO adsorbed on the edges is oxidized at more negative potential than that on the planes. Edge sites of the nano-particles promote CO oxidation.