Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction
Pd-Pt Bimetallic Nanodendrites with High Activity for Oxygen Reduction
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DOI：
10.1126/science.1170377
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发表时间：
2009-06-05
期刊：
影响因子：
56.9
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Lim, Byungkwon;Jiang, Majiong;Xia, Younan
控制Pt纳米结构的形态可以提供一个很好的机会，以改善其催化性能，并提高其活性的质量基础上。我们合成了Pd-Pt纳米枝晶组成的一个密集阵列的Pt分支的Pd核心，通过还原K2 PtCl 4与L-抗坏血酸在存在下，在水溶液中的均匀的Pd纳米晶种子。Pt支上支持的多面Pd纳米晶体表现出相对较大的表面积和特别活跃的方面对氧还原反应（ORR），在质子交换膜燃料电池中的速率决定步骤。Pd-Pt纳米枝晶在ORR的等效Pt质量的基础上比现有技术的Pt/C催化剂的活性高2.5倍，并且比第一代无载体Pt黑催化剂的活性高5倍。
Controlling the morphology of Pt nanostructures can provide a great opportunity to improve their catalytic properties and increase their activity on a mass basis. We synthesized Pd-Pt bimetallic nanodendrites consisting of a dense array of Pt branches on a Pd core by reducing K2PtCl4 with L-ascorbic acid in the presence of uniform Pd nanocrystal seeds in an aqueous solution. The Pt branches supported on faceted Pd nanocrystals exhibited relatively large surface areas and particularly active facets toward the oxygen reduction reaction (ORR), the rate-determining step in a proton-exchange membrane fuel cell. The Pd-Pt nanodendrites were two and a half times more active on the basis of equivalent Pt mass for the ORR than the state-of-the-art Pt/C catalyst and five times more active than the first-generation supportless Pt-black catalyst.