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

探索形状控制纳米颗粒的合成方法对设计新材料和高活性催化剂具有重要意义。利用伏安法和红外光谱研究了形状控制银和铂颗粒的结构和电化学性能。立方银颗粒的表面结构和电化学性能与银（100）相似。对Pt粒子的电化学评价表明，立方体和立方体Pt纳米粒子的平面分别由阶梯和原子平面组成。红外光谱结果表明，吸附在顶部边缘上的CO比吸附在表面上的CO氧化电位更高。纳米颗粒的边缘位置促进CO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.