Influence of Ni or Pt addition on dealloying behavior of Al2Au-based precursors in a NaOH aqueous solution

Influence of Ni or Pt addition on dealloying behavior of Al2Au-based precursors in a NaOH aqueous solution
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添加 Ni 或 Pt 对 Al2Au 基前驱体在 NaOH 水溶液中脱合金行为的影响

DOI:
10.1016/j.jallcom.2013.10.224
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发表时间:
2014-02
影响因子:
6.2
通讯作者:
Wu, Bo
Wu, Bo
中科院分区:
材料科学2区
文献类型:
--
作者:
Wang, Yan;Zhao, Zhengfeng;Wu, Bo

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从纳米孔结构的形成、Au的表面扩散和活化能等方面考察了添加Ni或Pt对Al2Au基前驱体脱合金化行为的影响。结果表明,Al66Au27.2Ni6.8和Al66Au27.2Pt6.8前驱体在氢氧化钠溶液中脱合金化可制得超细纳米孔Au-Ni和Au-Pt合金。添加镍或铂可以显著延缓Au的表面扩散,Au的表面扩散系数随脱合金化温度的不同从∼10−24到∼10−21m2s−1。此外,还估算了Al66Au27.2Ni6.8和Al66Au27.2Pt6.8的脱合金化激活能。
The influence of Ni or Pt addition on dealloying behavior of Al2Au-based precursors has been investigated considering the formation of nanoporous structure, surface diffusion of Au and activation energy. The results show that ultrafine nanoporous AuNi and AuPt alloys can be fabricated by dealloying Al66Au27.2Ni6.8and Al66Au27.2Pt6.8precursors in a NaOH solution. The addition of Ni or Pt can significantly retard surface diffusion of Au, and surface diffusivities of Au range from ∼10−24to ∼10−21m2s−1depending upon the dealloying temperature. Additionally, the activation energy has been evaluated for the dealloying of Al66Au27.2Ni6.8and Al66Au27.2Pt6.8.
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