Stellated Ag-Pt bimetallic nanoparticles: an effective platform for catalytic activity tuning.

Stellated Ag-Pt bimetallic nanoparticles: an effective platform for catalytic activity tuning.
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星形Ag-Pt双金属纳米颗粒:催化活性调节的有效平台

DOI:
10.1038/srep03969
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发表时间:
2014-02-05
期刊:
影响因子:
4.6
通讯作者:
Yang J
Yang J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Liu H;Ye F;Yao Q;Cao H;Xie J;Lee JY;Yang J

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通过将形态工程与第二种甚至第三种金属的策略性存在相结合,可以大大增强铂基纳米材料的催化作用。在这里,我们展示了星状Ag-Pt双金属纳米颗粒的设计和制备,其中甲醇氧化反应(MOR)和氧还原反应(ORR)之间的显着活性差异可以通过将Ag转移到核心或通过挖空核心来实现。特别是星状 Pt 表面,具有丰富的台阶、边缘、角原子和 {111} 面,对于 ORR 非常有效,但对于 MOR 无效。 MOR 活性仅在存在 Ag 核时通过与星状 Pt 壳的电子耦合才能观察到。因此,双金属 Ag-Pt 星状晶体证明了针对两种截然不同的结构敏感催化反应调整 Pt 表面的可行性。因此,星形双金属可能是高度可调催化剂设计的有效平台。
The usefulness of Pt-based nanomaterials for catalysis can be greatly enhanced by coupling morphology engineering to the strategic presence of a second or even third metal. Here we demonstrate the design and preparation of stellated Ag-Pt bimetallic nanoparticles where significant activity difference between the methanol oxidation reaction (MOR) and the oxygen reduction reaction (ORR) may be realized by relegating Ag to the core or by hollowing out the core. In particular the stellated Pt surface, with an abundance of steps, edges, corner atoms and {111} facets, is highly effective for the ORR but is ineffective for MOR. MOR activity is only observed in the presence of a Ag core through electronic coupling to the stellated Pt shell. The bimetallic Ag-Pt stellates therefore demonstrate the feasibility of tuning a Pt surface for two very different structure sensitive catalytic reactions. Stellated bimetallics may therefore be an effective platform for highly tunable catalyst designs.
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