物理化学学报 >> 2003, Vol. 19 >> Issue (05): 436-440.doi: 10.3866/PKU.WHXB20030512

研究论文 上一篇    下一篇

Zn 还原过渡金属化合物制备金属粉体的过程

俞莹;张启运;李星国   

  1. 北京大学化学与分子工程学院,北京 100871
  • 收稿日期:2002-10-14 修回日期:2002-12-16 发布日期:2003-05-15
  • 通讯作者: 张启运 E-mail:qyzh@chem.pku.edu.cn

Reduction Process of Transition Metal Ions by Zinc Powder to Prepare Transition Metal Nanopowder

Yu Ying;Zhang Qi-Yun;Li Xing-Guo   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871
  • Received:2002-10-14 Revised:2002-12-16 Published:2003-05-15

摘要: 用Zn粉还原过渡金属Fe、Co、Ni和Cu的硫酸盐和硫酸铵复盐溶液,获得了相应金属的纳米粉体.详细研究了此反应的还原过程.用XRD、SEM、TEM和ED等方法对产物进行了表征,发现析出的粉体不同程度上均生成有Zn置换的固溶体. Fe在Zn粒外层生成薄层Fe-Zn固溶体,Ni和Co为粒径分别为7.5 nm和12.1 nm的Zn饱和固溶体, Cu则在外层生成Cu5Zn8的新相.讨论了还原过程的机制,认为和M-Zn电池电动势的驱动力有关.

关键词: 纳米粉体, 过渡金属, Cu5Zn8, 固溶体, 锌还原

Abstract: Transition metal nanoclusters of Fe、Co、Ni and Cu have been obtained by Zn reduction in metal-ammonium sulfate solutions. The products were characterized by XRD, SEM, TEM and ED methods. Meantime, the reduction processes have especially been investigated. Experiments indicated that the nanoclusters were observed as solid solutions of displacement by zinc in varying extent. Fe displaced solid solution formed on the surface of zinc particles, however, Ni and Co nanoclusters formed as saturated solid solution with diameter about 7.5 nm and 12.1 nm, respectively. New phase of Cu5Zn8 was observed on the surface of Cu particles. The mechanism of the mentioned processes were discussed and considered as an influence by the driving force of EMF occurred from M-Zn oxidation-reduction cell.

Key words: Nanopowder, Transition metals, Cu5Zn8, Solid solution, Zn reduction