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首页> 外文期刊>Chemistry: A European journal >Facile Synthesis of Catalytically Active Platinum Nanosponges, Nanonetworks, and Nanodendrites
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Facile Synthesis of Catalytically Active Platinum Nanosponges, Nanonetworks, and Nanodendrites

机译：催化活性铂纳米海绵，纳米网络和纳米枝晶的简便合成

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In this paper, we report a simple approach for the preparation of various porous Pt nanomaterials (NMs) in aqueous solution. Employing different temperatures and concentrations of sodium dodecyl sulfate (SDS), we obtained Pt nanosponges, Pt nanonetworks, and Pt nanodendrites from the reduction of PtCl62- ions via galvanic replacement reactions with Te nanowires (length: 879 nm; diameter: 19 nm). At ambient temperature, Pt nanosponges and Pt nanodendrites formed selectively in the presence of SDS at concentrations of < 10 mM and > 50 mM, respectively. At elevated reaction temperatures, we obtained Pt nanonetworks and Pt nanodendrites in the presence of SDS at concentrations of < 10 mM and > 50 mM, respectively. Transmission electron microscopy images revealed that these Pt NMs were all composed of one dimensional Pt nanostructures having widths of 3.0 +/- 1.0 nm and lengths of 17.0 +/- 4.8 nm. Cyclic voltammetry data indicated that the as-prepared Pt nanonetworks, nanosponges, and nanodendrites possessed large electrochemically active surface areas (77.0, 70.4, and 41.4 m(2) g(-1), respectively). For the electrocatalytic oxidation of methanol, the ratio of the forward oxidation peak current (I-f) to the backward peak current (I-b) of the Pt nanodendrites, nanosponges, and nanonetworks were all high (I-f/I-b=2.88, 2.66, and 2.16, respectively). These three NMs exhibit greater electrocatalytic activities and excellent tolerance toward poisoning species for the oxidation of methanol when compared with the performance of standard Pt NMs.
机译：在本文中，我们报告了一种在水溶液中制备各种多孔Pt纳米材料（NMs）的简单方法。通过使用不同温度和浓度的十二烷基硫酸钠（SDS），我们通过与Te纳米线（长度：879 nm;直径：19 nm）的电化置换反应还原PtCl62-离子而获得了Pt纳米海绵，Pt纳米网络和Pt纳米树枝晶。在环境温度下，存在SDS时，分别在<10 mM和> 50 mM的浓度下选择性形成Pt纳米海绵和Pt纳米树枝晶。在升高的反应温度下，我们在存在SDS的情况下分别以<10 mM和> 50 mM的浓度获得了Pt纳米网络和Pt纳米树枝状晶体。透射电子显微镜图像显示这些Pt NM全部由一维Pt纳米结构组成，其宽度为3.0 +/- 1.0nm，长度为17.0 +/- 4.8nm。循环伏安数据表明，所制备的Pt纳米网络，纳米海绵和纳米枝晶具有较大的电化学活性表面积（分别为77.0、70.4和41.4 m（2）g（-1））。对于甲醇的电催化氧化，Pt纳米枝晶，纳米海绵和纳米网络的正向氧化峰值电流（If）与反向峰值电流（Ib）之比都很高（If / Ib = 2.88、2.66和2.16，分别）。与标准Pt NMs的性能相比，这三个NMs表现出更大的电催化活性和对甲醇氧化中毒物质的优异耐受性。

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