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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (2): 127-130. 上一篇    下一篇

研究论文

阳离子修饰纳米Pt的合成及其在Nafion膜上的自组装行为研究

唐浩林, 潘牧, 木士春, 袁润章   

  1. 武汉理工大学材料复合新技术国家重点实验室, 武汉, 430070
  • 投稿日期:2003-04-30 修回日期:2003-07-09 发布日期:2014-01-26
  • 通讯作者: 潘牧,E-mail:panmu@mail.whut.edu.cn E-mail:panmu@mail.whut.edu.cn
  • 基金资助:
    教育部博士点基金(No.20020497001)和材料复合技术国家重点实验室开放基金资助项目.

Synthesis of Pt Nano-particles Modified with Cation Ions and Its Self-assembly on Nafion Membrane

TANG Hao-Lin, PAN Mu, MU Shi-Chun, YUAN Run-Zhang   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing, Wuhan University of Technology, Wuhan 430070
  • Received:2003-04-30 Revised:2003-07-09 Published:2014-01-26

PDF

479

被引次数

35

以季铵阳离子聚合物为修饰离子、乙醇为还原剂,在水溶液中合成了具有稳定电位的阳离子修饰纳米Pt颗粒,还原过程采用UV-vis光谱监控,粒子形貌采用TEM表征.结果表明,合成体系在45 min左右还原完毕,颗粒粒径约为4.5 nm,呈多晶态结构,粒径分布狭窄,具有良好的分散性.采用Zeta电位测定仪分析了不同pH条件下粒子的电位,选择了合适的组装pH值并运用静电自组装的方法把Pt颗粒成功地组装到Nafion膜表面.同时对该自组装体系的影响因素进行了一些理论分析,并以此对组装过程的动力学性质和组装膜电化学特性进行了解释.

关键词: 季铵阳离子, 修饰, 纳米Pt, 静电自组装

Pt Nano-particles modified with quaternary ammonium cation were synthesized by chemical reduction. Crystalline Pt nano-particles with average diameter of ～4.5 nm, mono-dispersed in the solution, were obtained in the study. The Zeta potential of the Pt particles under different pH values were determined, and then the Pt solution with pH value of 11 8 was selected to assemble. As a result, Pt particles were successfully self-assembled on Nafion membrane surface. Furthermore, a reasonable mathematic model was put forward to ascertain the influence factors and the calculated results were used to explain the experiment results. The Pt particles coated Nafion membrane, which was fabricated without any mechanical operations and had specific strctures, will reasonably have potential application in micro PEMFC (proton exchange membrane fuel cell).

Key words: quaternary ammonium cation, modify, Pt nano-particle, electrostatic self-assembly