Syntheses of Sub-30 nm Au@Pd Concave Nanocubes and Pt-on-(Au@Pd) Trimetallic Nanostructures as Highly Efficient Catalysts for Ethanol Oxidation

Syntheses of Sub-30 nm Au@Pd Concave Nanocubes and Pt-on-(Au@Pd) Trimetallic Nanostructures as Highly Efficient Catalysts for Ethanol Oxidation
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亚 30 nm Au@Pd 凹面纳米立方体和 Pt-on-(Au@Pd) 三金属纳米结构的合成作为高效乙醇氧化催化剂

DOI:
10.1021/jp304570c
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发表时间:
2012-09
影响因子:
3.7
通讯作者:
Xu, Bo-Qing
Xu, Bo-Qing
中科院分区:
化学3区
文献类型:
--
作者:
Zhang, Gui-Rong;Wu, Jie;Xu, Bo-Qing

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含Pd和/或Pt的金属纳米结构的形态的设计操纵代表了在高效贵金属催化剂的研究中的挑战。我们在此提供了通过在截顶八面体Au晶种上沉积Pd原子来第一次选择性合成封闭有高折射率Pd面的窄尺寸小(21 nm)Au@Pd凹纳米立方体。此外,Pt在这些Au@Pd凹纳米立方体上的进一步受控沉积产生具有锯齿状富Pt表面的亚30 nm三金属Pt-on-(Au@Pd)纳米结构。所制备的Au@Pd和Pt-on-(Au@Pd)纳米结构被发现是高活性的,并且当用作乙醇电氧化的阳极催化剂时是相当稳定的,它们的活性归一化为Pd或Pd加Pt的质量比常规Pd黑催化剂高7-9倍。这些数据可能反映了创新的小型多金属纳米结构对于高效催化剂的重要性,这些催化剂严重依赖于贵金属的使用,用于能源,环境和能源领域的应用。
Designed manipulation of the morphology of metallic nanostructures containing Pd and/or Pt represents a challenge in the search of highly efficient precious metal catalysts. We provide herein the first selective synthesis of narrowly sized small (21 nm) Au@Pd concave nanocubes enclosed with high-index Pd facets by deposition of Pd atoms on truncated-octahedral Au seeds. Moreover, further controlled deposition of Pt onto these Au@Pd concave nanocubes produces sub-30 nm trimetallic Pt-on-(Au@Pd) nanostructures having jagged Pt-rich surfaces. The as-prepared Au@Pd and Pt-on-(Au@Pd) nanostructures are found highly active and fairly stable when employed as anode catalysts for ethanol electrooxidation, their activity normalized to the mass of Pd or Pd plus Pt being 7–9 times higher than conventional Pd black catalyst. These data may echo the importance of innovative small multimetallic nanostructures for highly efficient catalysts that depend critically on use of precious metals, for applications in energy, env...
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