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Acc. Chem. Res.最新综述：高指数晶面贵金属纳米晶
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高指数晶面的贵金属纳米晶往往具有更高的反应活性或者催化活性，受到了很广泛的研究，本文综述了这方面近年来的工作进展，对做贵金属以及催化，燃料电池方面的朋友会有所启发。文章12页，引文43篇。作者信息及摘要如下： BIOGRAPHICAL INFORMATION Zewei Quan was born in Luoyang, China, in 1982. After obtaining his B.Sc. degree in Chemistry from Wuhan University in 2004, he received his Ph.D. degree in Inorganic Chemistry from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (with Prof. Jun Lin) in 2009. He was a postdoctoral fellow and now is a research scientist in Department of Chemistry at the State University of New York at Binghamton. His current research interests include solution-phase synthesis, self-assembly, and energy conversion of nanostructured materials. Yuxuan Wang was born in Beijing, China in 1984. He received his B.Sc. degree in Material Science and Engineering from Tsinghua University in 2007. Heisnowconducting Ph.D. research in theMaterial Science and Engineering program at the State University of New York at Binghamton. His current research work focuses on shape-controlled synthesis of Pt-based nanomaterials and their potential applications. Jiye Fang is currently an Associate Professor of Chemistry and director of Materials Science Program/Track, State University of New York at Binghamton. After he graduated from Lanzhou University, he received his M.Sc. in Chemistry and Ph.D. in Materials Science from National University of Singapore in 1994 and 1998, respectively. He was a postdoctoral fellow and subsequently a research specialist in Advanced Materials Research Institute, before joining the Chemistry Department at University of New Orleans as an Assistant Professor in 2002. He was an NSF CAREER award winner. His research direction is shape-controlled synthesis of functional nanomaterials. Abstract： The formation of novel and complex structures with specific morphologies from nanocrystals via a direct assembly of atoms or ions remains challenging. In recent years, researchers have focused their attention on nanocrystals of noble metals and their controlled synthesis, characterization, and potential applications. Although the synthesis of various noble metal nanocrystals with different morphologies has been reported, most studies are limited to low-index facet-terminated nanocrystals. High-index facets, denoted by a set of Miller indices {hkl} with at least one index greater than unity, possess a high density of low-coordinated atoms, steps, edges, and kinks within these structures and serve as more active catalytic sites. With the potential for enhanced catalytic performance, researchers have used the insights from shape-controlled nanocrystal synthesis to construct noble metal nanocrystals bounded with high-index facets. Since the report of Pt tetrahexahedral nanocrystals, researchers have achieved significant progress and have prepared nanocrystals with various high-index facets. Because of the general order of surface energy for noble metals, high-index facets typically vanish faster in a crystal growth stage and are difficult to preserve on the surface of the final nanocrystals. Therefore researchers have had limited opportunities to examine high-indexed noble metal nanocrystals with a controlled morphology and investigate their resultant behaviors in depth. In this Account, we thoroughly discuss the basic concepts and state-of-the-art morphology control of some noble metal nanocrystals enclosed with high-index facets. We briefly introduce high-index facets from both crystallographic and geometrical points of view, both of which serve as methods to classify these high-index facets. Then, we summarize various typical noble metal nanocrystals terminated by different types of high-index facets, including {hk0} (h > k > 0), {hhl} (h > l > 0), {hkk} (h > k > 0), and {hkl} (h > k > l > 0). In each type, we describe several distinct morphologies including convex, concave, and other irregular shapes in detail. Based on these remarks, we discuss key factors that may induce the variations of Miller indices in each class, such as organic capping ligands and metallic cationic species. In a look at applications, we review several typical high-indexed noble metal nanocrystals showing enhanced electrocatalytic or chemical catalytic activities.  [ 来自科研家族 材料家族 ] |
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2012-05-16 12:12:58, 1002.94 K
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 资源收集 | nano physics&chem | 综述类 | 纳米科学和材料科学 |
| 纳米化学/电化学综述 | 燃料电池纳米催化剂种种 | 新技术 | 晶体制备及测试 |
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