Dimethylformamide-mediated synthesis of water-soluble platinum nanodendrites for ethanol oxidation electrocatalysis
Dimethylformamide-mediated synthesis of water-soluble platinum nanodendrites for ethanol oxidation electrocatalysis
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DOI：
10.1039/c3nr00924f
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Liz-Marzan, Luis M.
中科院分区：
文献类型：
--
作者：
Mourdikoudis, Stefanos;Chirea, Mariana;Liz-Marzan, Luis M.
本文描述了在二甲基甲酰胺（DMF）中，聚乙烯亚胺（PEI）作为稳定剂存在下，水溶性铂纳米枝晶的合成。枝晶的平均尺寸在20 ~ 25 nm之间，孔隙率可以通过改变金属前驱体的浓度来调节。电子断层扫描揭示了纳米枝晶中纳米晶体的不同取向，从而更好地理解了纳米枝晶特有的分支和孔隙度。BET测量证实了该纳米枝晶的高表面积(高达22 m(2) g(-1))，而x射线衍射证实了在Pt的面心立方晶体结构中存在丰富的高指数切面。制备的纳米枝晶在碱性溶液中电催化氧化乙醇中表现出优异的性能。通过循环伏安法测定，证明了对中毒的敏感、选择性、循环性和良好的耐受性。
Herein we describe the synthesis of water-soluble platinum nanodendrites in dimethylformamide (DMF), in the presence of polyethyleneimine (PEI) as a stabilizing agent. The average size of the dendrites is in the range of 20-25 nm while their porosity can be tuned by modifying the concentration of the metal precursor. Electron tomography revealed different crystalline orientations of nanocrystallites in the nanodendrites and allowed a better understanding of their peculiar branching and porosity. The high surface area of the dendrites (up to 22 m(2) g(-1)) was confirmed by BET measurements, while X-ray diffraction confirmed the abundance of high-index facets in the face-centered-cubic crystal structure of Pt. The prepared nanodendrites exhibit excellent performance in the electrocatalytic oxidation of ethanol in alkaline solution. Sensing, selectivity, cycleability and great tolerance toward poisoning were demonstrated by cyclic voltammetry measurements.