Metal-Organic Framework-Immobilized Polyhedral Metal Nanocrystals: Reduction at Solid-Gas Interface, Metal Segregation, Core-Shell Structure, and High Catalytic Activity

被引：116
|
作者：
Aijaz, Arshad [1 ]
Akita, Tomoki [1 ]
Tsumori, Nobuko [2 ]
Xu, Qiang [1 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Ikeda, Osaka 5638577, Japan
[2] Toyama Natl Coll Technol, Toyama 9398630, Japan
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2013年 / 135卷 / 44期
关键词：
SHAPE CONTROL; HYDROGEN STORAGE; GOLD CLUSTERS; NANOPARTICLES; OXIDATION; SIZE; PD; ACTIVATION; SEPARATION; EVOLUTION;
D O I：
10.1021/ja4093055
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
For the first time, this work presents surfactant-free monometallic and bimetallic polyhedral metal nanocrystals (MNCs) immobilized to a metal-organic framework (MIL-101) by CO-directed reduction of metal precursors at the solid gas interface. With this novel method, Pt cubes and Pd tetrahedra were formed by CO preferential bindings on their (100) and (111) facets, respectively. PtPd bimetallic nanocrystals showed metal segregation, leading to Pd-rich core and Pt-rich shell. Core-shell Pt@Pd nanocrystals were immobilized to MIL-101 by seed-mediated two-step reduction, representing the first example of cure shell MNCs formed using only gas-phase reducing agents. These MOF-supported MNCs exhibited high catalytic activities for CO oxidation.
引用
收藏
页码：16356 / 16359
页数：4
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