Synthesis and High Electrocatalytic Performance of Hexagram Shaped Gold Particles Having an Open Surface Structure with Kinks  

作　　者：Qingning Jiang Zhiyuan Jiang Lei Zhang Haixin Lin Ning Yang Huan Li Deyu Liu Zhaoxiong Xie Zhongqun Tian 

机构地区：[1]State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering,Xiamen University, Xiamen 361005, China

出　　处：《Nano Research》2011年第6期612-622,共11页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China （Grant Nos. 20725310, 21021061, and 21073145）, the National Basic Research Program of China （Grant No. 2007CB815303 and 2009CB939804） and Program for New Century Excellent Talents in Fujian Province Universities.

摘　　要：Hexagram shaped gold particles and their analogues enclosed by high index facets with kinks have been successfully synthesized by reducing HAuCl4 with ascorbic acid （AA） in the presence of poly（diallyldimethylammonium chloride） at room temperature. By using electron microscopy, the surfaces of the hexagram shaped Au particle were found to be {541} planes, which contain high-density steps and kinks. In addition, it was found that hexagonal shield-like and other kind of particles present in the product were analogues of the hexagram shaped Au particles structure, in that they had the same surface structure. In order to confirm the surface structure of all the prepared particles, surface structure sensitive underpotential deposition of Pb was carried out, and the cyclic voltammetric profile was in accordance with the proposed {541} surface. Finally, structure-property relationships of the Au hexagrams were experimentally analyzed by employing the electrocatalytic oxidation of AA as a probe reaction. The electrocatalytic reactions of gold cubes with low-index {100} facets and gold trioctahedra with {221} facets were studied as references. The experimental results showed that the hexagram shaped Au particles and their analogues with exposed {541} facets have the highest catalytic activity among the three kinds of gold particles, owing to the high density of kink atoms. This study should motivate us to further explore methods for the preparation of other well-defined polyhedral metal nanocrystals enclosed by high index surfaces.塑造的金粒子和他们的类似物与性变态由高索引方面围住的六芒星形被与维生素酸(AA ) 减少 HAuCl4 面对成功地综合了 poly (diallyldimethylammonium 氯化物) 在房间温度。由使用电子显微镜学，塑造的 Au 粒子被发现是的六芒星形的表面 { 541 } 飞机，它包含高密度的步和性变态。另外，它被发现那六角形像盾并且在产品在场的其它种粒子是塑造的 Au 粒子组织的六芒星形的类似物，在那，他们有一样的表面结构。以便证实所有准备粒子的表面结构，表面结构 Pb 的敏感 underpotential 免职被执行，并且周期的 voltammetric 侧面根据求婚 { 541 } 表面。最后， Au 六芒星形的结构性质关系被作为探查反应采用 AA 的 electrocatalytic 氧化试验性地分析。金立方体与的 electrocatalytic 反应低索引 { 100 } 方面和金 trioctahedra 与 { 221 } 方面作为参考书被学习。试验性的结果证明六芒星形塑造了 Au 粒子和他们的类似物与暴露 { 541 } 方面在三种金粒子之中举办最高催化的活动，由于纽结原子的高密度。这研究应该激发我们进一步为高索引表面围住的另外的明确的多面的金属 nanocrystals 的准备探索方法。

关 键 词：Hexagram shaped gold particles surface structure high index facets with kinks structure-property relationship ELECTROCATALYSIS crystal growth 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]