Colloidal nanocrystal clusters (CNCs), which are composed of many nanocrystal subunits, have attracted intensive attention because they can possess not only the properties of each single subunit but also the collective properties and novel functionalities resulting from the ensembles. However, to date, the successful preparation of metal CNCs has rarely been reported. In this work, a simple one‐pot solvothermal method is developed to prepare PtNi‐alloyed CNCs with homogeneous distribution of Pt and Ni elements, porous feature, and interconnected steady framework. The PtNi CNCs are composed of many PtNi nanocrystals with size around 7–8 nm. Their growth mechanism is proposed through a systematic study. Thanks to the unique structure, the as‐prepared PtNi CNCs show better catalytic performance in methanol oxidation reaction than that of PtNi nanocrystals and Pt/C catalysts. This work is important because it not only provides a new method for the preparation of metal CNCs with desired morphology and properties, but also paves the way for practical applications of metal nanoparticles.

中文翻译：

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溶剂热合成具有增强催化活性的甲醇氧化合金PtNi胶体纳米晶体簇（CNC）

由许多纳米晶体亚基组成的胶体纳米晶体簇（CNC）引起了广泛的关注，因为它们不仅具有每个单个亚基的特性，而且还具有集合体的集体特性和新颖的功能性。但是，迄今为止，很少有成功制备金属CNC的报道。在这项工作中，开发了一种简单的单锅溶剂热法，以制备具有均匀分布的Pt和Ni元素，多孔特征以及相互连接的稳定框架的PtNi合金CNC。PtNi CNCs由许多尺寸约为7–8 nm的PtNi纳米晶体组成。通过系统研究提出了它们的生长机理。得益于独特的结构，所制备的PtNi CNCs在甲醇氧化反应中显示出比PtNi纳米晶体和Pt / C催化剂更好的催化性能。这项工作很重要，因为它不仅为制备具有所需形态和性能的金属CNC提供了一种新方法，而且为金属纳米颗粒的实际应用铺平了道路。