Platinum-based intermetallic nanotubes with a core–shell structure as highly active and durable catalysts for fuel cell applications
Platinum-based intermetallic nanotubes with a core–shell structure as highly active and durable catalysts for fuel cell applications
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DOI：
10.1016/j.jpowsour.2013.05.023
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发表时间：
2013-10
影响因子：
9.2
通讯作者：
C. Du;Meng Chen;Wengang Wang;Q. Tan;K. Xiong;Geping Yin
中科院分区：
文献类型：
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作者：
C. Du;Meng Chen;Wengang Wang;Q. Tan;K. Xiong;Geping Yin
本文介绍了PtCu金属间化合物纳米管的简易合成，这是通过电流置换反应获得的Cu纳米线作为模板，然后通过化学蚀刻和热退火。利用扫描电子显微镜、X射线衍射仪和X射线光电子能谱仪对PtCu金属间化合物纳米管进行了表征。循环伏安法和计时电流法的结果表明，这些PtCu纳米管表现出显着高的催化活性对甲酸氧化反应相比，传统的Pt/C催化剂。此外，在加速老化测试中，PtCu纳米管显示出比Pt/C催化剂高>10倍的耐久性。结果表明，PtCu金属间化合物纳米管具有Pt/PtCu核-壳纳米结构，该结构结合了核-壳纳米颗粒的可定制电子结构和一维纳米管的独特几何形状的优点，这协同地有助于活性和耐久性。我们相信，分层金属间化合物纳米管的设计概念和通用的合成策略不仅可以用于燃料电池催化剂，而且还可以潜在地扩展到其他催化领域。
This paper describes the facile synthesis of the PtCu intermetallic nanotubes, which are obtained by a galvanic replacement reaction using Cu nanowires as templates followed by chemical etching and heat annealing. Scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy are used to characterize the PtCu intermetallic nanotubes. Both cyclic voltammetry and chronoamperometry results demonstrate that these PtCu nanotubes exhibit significantly high catalytic activity toward the formic acid oxidation reaction in comparison with the conventional Pt/C catalyst. Furthermore, the PtCu nanotubes show >10 times higher durability than the Pt/C catalyst in the accelerated ageing test. It is revealed that the PtCu intermetallic nanotubes have a Pt/PtCu core–shell nanostructure that combines the merits of tailorable electronic structures for core–shell nanoparticles and unique geometries for one-dimensional nanotubes, which synergistically contribute to the activity and durability. We believe that the design concept of hierarchy intermetallic nanotubes and the versatile synthetic strategy can not only be used for fuel cell catalysts but also be potentially extended to other catalysis fields.