Tailored design of architecturally controlled Pt nanoparticles with huge surface areas toward superior unsupported Pt electrocatalysts.
Tailored design of architecturally controlled Pt nanoparticles with huge surface areas toward superior unsupported Pt electrocatalysts.
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DOI：
10.1021/am300574e
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发表时间：
2012-06
影响因子：
9.5
通讯作者：
Liang Wang;M. Imura;Y. Yamauchi
中科院分区：
文献类型：
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作者：
Liang Wang;M. Imura;Y. Yamauchi
在此，我们报道了一种非常简单和快速的方法来合成两种类型的具有开放多孔结构的Pt纳米颗粒（即，Pt纳米枝晶和多臂Pt纳米星）。本合成通过在室温下在抗坏血酸（AA）的存在下对含有K2 PtCl 4和具有支链烷基链的非离子嵌段共聚物的水溶液进行简单的超声处理来进行。通过简单地控制反应体系中嵌段共聚物的溶解量，选择性地合成了具有不同Pt纳米结构的纳米枝晶和多臂纳米星。所制备的3D Pt纳米枝晶和具有明确形态的多臂Pt纳米星是高度多孔和自支撑的结构，其由交错的纳米臂作为构建块组装，从而实现极高的表面积（约80 m2 g-1）。本合成具有显着的优势，在其简单的合成铂纳米催化剂，与其他以前的方法相比。我们的Pt纳米枝晶和Pt纳米星不仅提高了活性Pt表面积，而且还显示出上级电化学性能，这使它们成为未来有前途的电催化剂。
Herein, we report a very simple and rapid method to synthesize two types of Pt nanoparticles with open porous structures (i.e., Pt nanodendrites and multiarmed Pt nanostars) in high yield. The present synthesis is performed by a simple sonication treatment of an aqueous solution containing K2PtCl4 and a nonionic block copolymer with branched alkyl chains in the presence of ascorbic acid (AA) at room temperature. Nanodendrites and multiarmed nanostars with different Pt nanostructures are selectively synthesized by simply controlling the dissolved block copolymer amounts in the reactive system. As-prepared 3D Pt nanodendrites and multiarmed Pt nanostars with well-defined morphologies are highly porous and self-supported structures assembled by staggered nanoarms as building blocks, thereby realizing extremely high surface areas (around 80 m(2) g(-1)). The present synthesis has a remarkable advantage in its simplicity for the synthesis of Pt nanocatalysts, in comparison with other previous approaches. Our Pt nanodendrites and Pt nanostars not only improve the active Pt surface area but also show superior electrochemical performance, which make them promising electrocatalysts for future.