Rapid and Efficient Synthesis of Platinum Nanodendrites with High Surface Area by Chemical Reduction with Formic Acid
Rapid and Efficient Synthesis of Platinum Nanodendrites with High Surface Area by Chemical Reduction with Formic Acid
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DOI：
10.1021/cm9038889
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发表时间：
2010-05-11
影响因子：
8.6
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Wang, Liang;Wang, Hongjing;Yamauchi, Yusuke
由大量棱角原子组成的铂纳米结构对于提高铂材料的催化性能和有效利用是非常有利的。在最近的研究中，我们已经表明Pluronic F127三嵌段共聚物可以帮助形成树枝状铂纳米颗粒（Wang，L.; Yamauchi，Y. J. Am. 2009，131，9152 -9153）。在此，我们扩展了这一概念，通过使用各种类型的非离子有机分子来产生具有互连臂的铂纳米枝晶（PND）。具有复杂纳米结构的PDN简单地通过在非离子有机分子的存在下对含有K2 PtCl 4前体和甲酸的水溶液进行超声处理来产生，而不需要任何模板、种子介导的生长和添加剂。所产生的PDN被证明是积极的作为纳米电催化剂的电氧化甲酸。所研究的非离子有机分子包括非离子表面活性剂，例如，Pluronic F127、Brij 700、Tetronic 1107和聚合物，例如，聚（乙烯基吡咯烷酮）（PVP）和聚（1-乙烯基吡咯烷酮-共-乙酸乙烯酯）（PVP-co-VA）。用Pluronic F127制备的典型PND具有大畴的铂原子结晶态，并显示出高表面积（32 m（2）g（-1））。所提出的方法对于促进在宽范围的铂前体浓度下生产PND是非常有利的。由于其高度的灵活性和简单的实施，所提出的方法可以被认为是一个非常普遍和强大的战略生产PND具有高表面积和开放的树枝状纳米结构的商业设备。此外，甲酸在PND合成中的双重作用，即，还原剂和结构导向剂，初步提出了基于调查结果。
Platinum nanoarchitectures consisting of a large number of edges and corner atoms are highly favorable for enhancing the catalytic performance and efficient utilization of platinum materials. In a recent study, we have shown that Pluronic F127 triblock copolymer can assist the formation of dendritic platinum nanoparticles (Wang, L.; Yamauchi, Y. J. Am. Chem. Soc. 2009, 131,9152-9153). Herein, we expand this concept to produce platinum nanodendrites (PNDs) with interconnected arms by using various types of nonionic organic molecules. The PDNs with complex nanoarchitectures are produced simply by sonicating treatment of an aqueous solution containing K2PtCl4 precursor and formic acid in the presence of nonionic organic molecules without the need for any template, seed-mediated growth, and additive. As-produced PDNs were shown to be active as nanoelectrocatalysts for electro-oxidation formic acid. The investigated nonionic organic molecules include nonionic surfactants, e.g., Pluronic F127, Brij 700, Tetronic 1107, and polymer, e.g., poly(vinyl pyrrolidone) (PVP) and poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VA). The typical PNDs produced with Pluronic F127 possess platinum atomic crystalline state with large domains and show high surface area (32 m(2) g(-1)). The proposed approach is highly favorable for facilitating the producing of PNDs in a wide range of platinum precursor concentrations. Because of its high flexibility and simple implement, the proposed approach can be considered as a very general and powerful strategy for producing PNDs with high surface area and open dendritic nanostructures for commercial devices. Furthermore, the dual roles of formic acid in synthesis of PNDs, i.e., reducing agent and structure-directing agent, are tentatively proposed based on the investigation results.