Synergistic Catalysis of Au@Ag Core−Shell Nanoparticles Stabilized on Metal−Organic Framework

作者：Hai‐Long Jiang, Tomoki Akita, Tamao Ishida, Masatake Haruta, Qiang Xü · 发表于：Journal of the American Chemical Society · 年份：2011 · DOI：10.1021/ja1099006 · 被引用次数：932 · 研究领域：Nanomaterials for catalytic reactions、Nanocluster Synthesis and Applications、Catalytic Processes in Materials Science

For the first time, this work presents Au@Ag core-shell nanoparticles (NPs) immobilized on a metal-organic framework (MOF) by a sequential deposition-reduction method. The small-size Au@Ag NPs reveal the restriction effects of the pore/surface structure in the MOF. The modulation of the Au/Ag ratio can tune the composition and a reversed Au/Ag deposition sequence changes the structure of Au-Ag NPs, while a posttreatment process transforms the core-shell NPs to a AuAg alloy. Catalytic studies show a strong bimetallic synergistic effect of core-shell structured Au@Ag NPs, which have much higher catalytic activities than alloy and monometallic NPs.