• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >A general and high-yield galvanic displacement approach to Au-M (M=Au, Pd, and Pt) core-shell nanostructures with porous shells and enhanced electrocatalytic performances
【24h】

A general and high-yield galvanic displacement approach to Au-M (M=Au, Pd, and Pt) core-shell nanostructures with porous shells and enhanced electrocatalytic performances

机译：具有多孔壳和增强电催化性能的Au-M（M = Au，Pd和Pt）核-壳纳米结构的通用且高产的电置换方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this work, we utilize the galvanic displacement synthesis and make it a general and efficient method for the preparation of Au-M (M=Au, Pd, and Pt) core-shell nanostructures with porous shells, which consist of multilayer nanoparticles. The method is generally applicable to the preparation of Au-Au, Au-Pd, and Au-Pt core-shell nanostructures with typical porous shells. Moreover, the Au-Au isomeric core-shell nanostructure is reported for the first time. The lower oxidation states of Au ~I, Pd ~(II), and Pt ~(II) are supposed to contribute to the formation of porous core-shell nanostructures instead of yolk-shell nanostructures. The electrocatalytic ethanol oxidation and oxygen reduction reaction (ORR) performance of porous Au-Pd core-shell nanostructures are assessed as a typical example for the investigation of the advantages of the obtained core-shell nanostructures. As expected, the Au-Pd core-shell nanostructure indeed exhibits a significantly reduced overpotential (the peak potential is shifted in the positive direction by 44 mV and 32 mV), a much improved CO tolerance (I _f/I _b is 3.6 and 1.63 times higher), and an enhanced catalytic stability in comparison with Pd nanoparticles and Pt/C catalysts. Thus, porous Au-M (M=Au, Pd, and Pt) core-shell nanostructures may provide many opportunities in the fields of organic catalysis, direct alcohol fuel cells, surface-enhanced Raman scattering, and so forth. Galvanic displacement synthesis has been employed as a general and efficient method for the preparation of core-shell nanostructures with porous shells. The method is generally applicable to the preparation of Au-Au, Au-Pd, and Au-Pt porous core-shell nanostructures (see figure). The lower oxidation states of Au ~I, Pd ~(II), and Pt ~(II) contribute to the formation of the porous core-shell nanostructures.
机译：在这项工作中，我们利用电位移合成，使其成为制备具有多孔壳的Au-M（M = Au，Pd和Pt）核壳纳米结构的通用且有效的方法，该结构由多层纳米粒子组成。该方法通常适用于制备具有典型多孔壳的Au-Au，Au-Pd和Au-Pt核壳纳米结构。此外，首次报道了Au-Au异构核-壳纳米结构。推测Au〜I，Pd〜（II）和Pt〜（II）的较低氧化态有助于形成多孔核-壳纳米结构，而不是卵黄-壳纳米结构。评价多孔Au-Pd核壳纳米结构的电催化乙醇氧化和氧还原反应（ORR）性能，作为研究所得核壳纳米结构优点的典型实例。如预期的那样，Au-Pd核-壳纳米结构确实表现出明显降低的过电势（峰值电势在正方向上偏移了44 mV和32 mV），大大提高了CO耐受性（I _f / I _b为3.6和1.63）与Pd纳米颗粒和Pt / C催化剂相比，催化稳定性更高。因此，多孔的Au-M（M = Au，Pd和Pt）核-壳纳米结构可在有机催化，直接酒精燃料电池，表面增强拉曼散射等领域提供许多机会。电位移合成已被用作制备具有多孔壳的核-壳纳米结构的通用且有效的方法。该方法通常适用于制备Au-Au，Au-Pd和Au-Pt多孔核-壳纳米结构（见图）。 Au〜I，Pd〜（II）和Pt〜（II）的较低氧化态有助于形成多孔核-壳纳米结构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号