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

作者：A. Aijaz, Tomoki Akita, Nobuko Tsumori, Qiang Xü · 发表于：Journal of the American Chemical Society · 年份：2013 · DOI：10.1021/ja4093055 · 被引用次数：131 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Catalytic Processes in Materials Science、Nanocluster Synthesis and Applications

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 core-shell MNCs formed using only gas-phase reducing agents. These MOF-supported MNCs exhibited high catalytic activities for CO oxidation.