Shape-Dependent Catalytic Properties of Pt Nanoparticles
Shape-Dependent Catalytic Properties of Pt Nanoparticles
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DOI：
10.1021/ja106679z
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发表时间：
2010-11-10
影响因子：
15
通讯作者：
Roldan Cuenya, Beatriz
中科院分区：
文献类型：
--
作者：
Mostafa, Simon;Behafarid, Farzad;Roldan Cuenya, Beatriz
在原子水平上定制纳米材料的化学反应活性是催化研究中最重要的挑战之一。为了实现这一难以实现的目标，必须在原子水平上对这些复杂系统的几何和电子结构有基本的了解。本文报道了纳米粒子形状对以γ-Al_2O_3为载体的铂纳米催化剂反应活性的影响。通过反胶束包裹制备的平均粒径分布相似(类似于0.8-1 nm)、但形状不同的纳米粒子对异丙醇的氧化表现出明显的反应活性。观察到纳米粒子表面的欠配位原子数与异丙醇氧化起始温度之间的关系，表明可以通过择形合成来控制催化性能。
Tailoring the chemical reactivity of nanomaterials at the atomic level is one of the most important challenges in catalysis research. In order to achieve this elusive goal, fundamental understanding of the geometric and electronic structure of these complex systems at the atomic level must be obtained. This article reports the influence of the nanoparticle shape on the reactivity of Pt nanocatalysts supported on gamma-Al2O3. Nanoparticles with analogous average size distributions (similar to 0.8-1 nm), but with different shapes, synthesized by inverse micelle encapsulation, were found to display distinct reactivities for the oxidation of 2-propanol. A correlation between the number of undercoordinated atoms at the nanoparticle surface and the onset temperature for 2-propanol oxidation was observed, demonstrating that catalytic properties can be controlled through shape-selective synthesis.