Length-Scale Modulated and Electrocatalytic Activity Enhanced Nanoporous Gold by Doping
Length-Scale Modulated and Electrocatalytic Activity Enhanced Nanoporous Gold by Doping
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通过掺杂进行长度尺度调制和电催化活性增强的纳米多孔金
DOI：
10.1021/jp110011w
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发表时间：
2011-02
期刊：
影响因子：
--
通讯作者：
Eggeler, Gunther
中科院分区：
文献类型：
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作者：
Wang, Xiaoguang;Frenzel, Jan;Wang, Weimin;Ji, Hong;Qi, Zhen;Zhang, Zhonghua;Eggeler, Gunther
本文研究了铂和钯掺杂的Al_2Au金属间化合物的脱合金化和超细纳米孔Au(NP-Au)合金的化学脱合金化。微观结构表征证实，这些掺杂原子进入前驱体的晶格，然后转移到所得到的NP-Au中，两者都以固溶体的形式存在。当在20wt%NaOH溶液中进行脱合金化时，加入一定量的铂和钯具有较好的细化效果，并且As掺杂的NP-Au的韧带/沟道尺寸可以很容易地调节到10 nm以下。然而，在5wt%HCl溶液中进行脱合金化时，与Pd掺杂相比，掺铂的抗粗化能力更显著。此外，兴奋剂的用量对韧带抗粗化能力也有重要影响。在NP-Au中引入铂和/或钯，除了导致韧带/通道的细化外，还产生了更好的效果。
In the present paper, we have investigated the dealloying of Pt- and/or Pd-doped Al2Au intermetallic compounds and the formation of ultrafine nanoporous Au (np-Au) alloys through a chemical dealloying strategy. The microstructural characterization confirms that these doping atoms enter into crystal lattices of the precursors and then transmit into the as-obtained np-Au, both existing in the form of solid solutions. When dealloying in the 20 wt % NaOH solution is performed, a certain amount of Pt and/or Pd addition shows a superior refining effect and the ligament/channel sizes of the as-doped np-Au can be facilely modulated below 10 nm. When dealloying in the 5 wt % HCl solution is performed, however, the anticoarsening capacity of Pt doping is more remarkable compared with that of Pd doping. In addition, the amount of doping also has an important influence on the ligament resistance to coarsening. Apart from causing the refinement of ligaments/channels, the introduction of Pt and/or Pd into np-Au has gen...