| 查看: 25170 | 回复: 718 | ||||
| 【奖励】 本帖被评价254次，作者xiejf增加金币 200.4 个 | ||||
| 本帖产生 2 个 MN-EPI ，点击这里进行查看 | ||||
| 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)
|
[资源]
Acc. Chem. Res.最新综述：核-壳结构纳米催化剂
|
|||
|
最新一期的Acc. Chem. Res.刊发了由美国加利福尼亚大学河滨分校殷亚东教授课题组撰写的题为Core–Shell Nanostructured Catalysts的研究性综述，主要讲述了核壳结构的制备，形成机理以及进展，并着重介绍了核壳纳米结构作为催化剂的优势以及研究进展。文章9页，引文44篇。 Novel nanotechnologies have allowed great improvements in the syn-thesis of catalysts with well-controlled size, shape, and surface properties. Transition metal nanostructures with specific sizes and shapes, for instance, have shown great promise as catalysts with high selectivities and relative ease of recycling. Researchers have already demonstrated new selective catalysis with solution-dispersed or supported-metal nanocatalysts, in some cases applied to new types of reactions. Several challenges remain, however, particularly in improving the structural stability of the catalytic active phase. Core–shell nanostructures are nanoparticles encapsulated and protected by an outer shell that isolates the nanoparticles and prevents their migration and coalescence during the catalytic reactions. The synthesis and characterization of effective core–shell catalysts has been at the center of our research efforts and is the focus of this Account. Efficient core–shell catalysts require porous shells that allow free access of chemical species from the outside to the surface of nanocatalysts. For this purpose, we have developed a surface-protected etching process to prepare mesoporous silica and titania shells with controllable porosity. In certain cases, we can tune catalytic reaction rates by adjusting the porosity of the outer shell. We also designed and successfully applied a silica-protected calcination method to prepare crystalline shells with high surface area, using anatase titania as a model system. We achieved a high degree of control over the crystallinity and porosity of the anatase shells, allowing for the systematic optimization of their photocatalytic activity. Core–shell nanostructures also provide a great opportunity for controlling the interaction among the different components in ways that might boost structural stability or catalytic activity. For example, we fabricated a SiO2/Au/N-doped TiO2 core-shell photocatalyst with a sandwich structure that showed excellent catalytic activity for the oxidation of organic compounds under UV, visible, and direct sunlight. The enhanced photocatalytic efficiency of this nanostructure resulted from an added interfacial nonmetal doping, which improved visible light absorption, and from plasmonic metal decoration that enhanced light harvesting and charge separation. In addition to our synthetic efforts, we have developed ways to evaluate the accessibility of reactants to the metal cores and to characterize the catalytic properties of the core–shell samples we have synthesized. We have adapted infrared absorption spectroscopy and titration experiments using carbon monoxide and other molecules as probes to study adsorption on the surface of metal cores in metal oxide–shell structures in situ in both gas and liquid phases. In particular, the experiments in solution have provided insights into the ease of diffusion of molecules of different sizes in and out of the shells in these catalysts. .  1.jpg  2.jpg [ 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：xiaomuchong@tal.com - 附件 1 : Core–ShellNanostructuredCatalysts.pdf
2012-12-27 10:16:21, 1.08 M
» 收录本帖的淘帖专辑推荐
» 本帖已获得的红花（最新10朵）
熊熊--123» 猜你喜欢
求助一篇MEMS散热器件文献
已经有0人回复
-
材化专业SCI论文（职称评定）
已经有0人回复
-
金属材料论文润色/翻译怎么收费?
已经有182人回复
-
材料化学专业SCI论文（职称评定）
已经有0人回复
» 本主题相关商家推荐: (我也要在这里推广)
» 本主题相关价值贴推荐，对您同样有帮助:
- Acc. Chem. Res.最新综述：基于大面积高质量石墨烯薄膜的杂化功能系统
已经有151人回复
- Acc. Chem. Res.最新综述：用于太阳能转化、存储、传感的石墨烯基复合物的设计与展望
已经有214人回复
- Acc. Chem. Res.最新文章：CVD法可控生长寡层石墨烯用于电子器件
已经有79人回复
- Acc. Chem. Res. 新综述--量子点的细胞毒性及减小毒性的方法
已经有119人回复
- Chem. Soc. Rev.最新综述：硒化镉与碲化镉量子点的电化学性能
已经有120人回复
- John B. Goodenough在Acc. Chem. Res.上的最新综述-现代可充电电池的策略演化
已经有440人回复
- 超级电容器大牛Y. Gogotsi在Acc. Chem. Res.的最新综述-纳米碳材料的电容能量存储
已经有1039人回复
- 张希院士在Acc. Chem. Res.上刚出的好综述：超两亲自组装
已经有604人回复
- ACS权威综述杂志Acc. Chem. Res.：对锂离子在锂插层化合物中扩散的理解
已经有536人回复
- 最近Chemical Reviews和Acc. Chem. Res.发表的几篇MOF类的文章
已经有164人回复
- 包信和院士Acc Chem Res，讨论了碳纳米管限域的催化剂
已经有168人回复
