| 查看: 1128 | 回复: 5 | |||||||||||||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||||||||||||
xiejf专家顾问 (文学泰斗)
麦麦爸爸爱小牛
|
[交流]
夏幼南在Acc. Chem. Res.的最新综述：铂纳米晶形貌控制合成及在催化领域的应用已有4人参与
|
||||||||||||
|
最新一期的Acc. Chem. Res.刊发了美国佐治亚理工大学夏幼南教授课题组撰写的题为Shape-Controlled Synthesis of Pd Nanocrystals and Their Catalytic Applications的研究性综述，主要综述了铂纳米晶的形貌控制合成以及在催化领域的应用。文章12页，引文34篇。 Palladium is a marvelous catalyst for a rich variety of reactions in industrial processes and commercial devices. Most Pd-catalyzed reactions exhibit structure sensitivity, meaning that the activity or selectivity depends on the arrangement of atoms on the surface. Previously, such reactions could only be studied in ultrahigh vacuum using Pd single crystals cut with a specific crystallographic plane. However, these model catalysts are far different from real catalytic systems owing to the absence of atoms at corners and edges and the extremely small specific surface areas for the model systems. Indeed, enhancing the performance of a Pd-based catalyst, in part to reduce the amount needed of this precious and rare metal for a given reaction, requires the use of Pd with the highest possible specific surface area. Recent advances in nanocrystal synthesis are offering a great opportunity to investigate and quantify the structural sensitivity of catalysts based on Pd and other metals. For a structure-sensitive reaction, the catalytic properties of Pd nanocrystals are strongly dependent on both the size and shape. The shape plays a more significant role in controlling activity and selectivity, because the shape controls not only the facets but also the proportions of surface atoms at corners, edges, and planes, which affect the outcomes of possible reactions. We expect catalysts based on Pd nanocrystals with optimized shapes to meet the increasing demands of industrial applications at reduced loadings and costs. In this Account, we discuss recent advances in the synthesis of Pd nanocrystals with controlled shapes and their resulting performance as catalysts for a large number of reactions. First, we review various synthetic strategies based on oxidative etching, surface capping, and kinetic control that have been used to direct the shapes of nanocrystals. When crystal growth is under thermodynamic control, the capping agent plays a pivotal role in determining the shape of a product by altering the order of surface energies for different facets through selective adsorption; the resulting product has the lowest possible total surface energy. In contrast, the product of a kinetically controlled synthesis often deviates from the thermodynamically favored structure, with notable examples including nanocrystals enclosed by high-index facets or concave surfaces. We then discuss the key parameters that control the nucleation and growth of Pd nanocrystals to decipher potential growth mechanisms and build a connection between the experimental conditions and the pathways to different shapes. Finally, we present a number of examples to highlight the use of these Pd nanocrystals as catalysts or electrocatalysts for various applications with structure-sensitive properties. We believe that a deep understanding of the shape-dependent catalytic properties, together with an ability to experimentally maneuver the shape of metal nanocrystals, will eventually lead to rational design of advanced catalysts with substantially enhanced performance. .  ar-2012-00209w_0010.gif [ 来自科研家族 材料家族 ] |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：libolin3@tal.com - 附件 1 : Shape-ControlledSynthesisofPdNanocrystalsandTheirCatalyticApplications.pdf
2012-11-20 10:28:00, 2.5 M
» 收录本帖的淘贴专辑推荐
 英文文献或者教材 | 纳米化学/电化学综述 | 燃料电池纳米催化剂种种 | nano review |
| 综述精华集 | 纳米材料的制备 | 有待查原文 | 纳米大牛 |
» 本帖已获得的红花（最新10朵）
毛毛虫毛毛虫虫» 猜你喜欢
P4VP的GPC测试
已经有3人回复
-
求购商用高炉煤气精脱硫水解催化剂
已经有37人回复
-
金属材料论文润色/翻译怎么收费?
已经有227人回复
-
中国科学技术大学苏州独墅会议，报销国际差旅，诚邀您的参加！
已经有0人回复
-
中国科学技术大学@苏州·独墅会议，报销国际差旅，诚邀您的参加！
已经有0人回复
-
CV测试为什么非常不稳定
已经有14人回复
-
中山大学孙逸仙纪念医院潘越教授团队招聘博士后（年薪45万），助理实验师
已经有16人回复
-
北京求能测金属粘度的地方
已经有4人回复
-
金属粘度测量
已经有0人回复
-
金属氧化物及氢氧化物电导率/电阻率
已经有0人回复
» 本主题相关商家推荐: (我也要在这里推广)
毛毛虫毛毛虫虫
至尊木虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 12071.3
- 帖子: 126
- 在线: 69.3小时
- 虫号: 206290
- 注册: 2006-03-04
- 性别: GG
- 专业: 半导体材料
5楼2013-03-13 09:29:32
10