高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (9): 1434.

• 论文 • 上一篇    下一篇

纳米MnO2的固相合成及其电化学性能的研究(Ⅰ)──纳米γ-MnO2的合成及表征

李娟, 夏熙, 李清文   

  1. 新疆大学应用化学研究所, 乌鲁木齐 830046
  • 收稿日期:1998-08-10 出版日期:1999-09-24 发布日期:1999-09-24
  • 通讯作者: 夏熙
  • 作者简介:李娟,女,26岁,硕士,讲师.
  • 基金资助:

    国家自然科学基金(批准号:29563007)资助课题

Synthesis and Electrochemical Properties of Nanophase MnO2by Solid-phase Reaction(Ⅰ)──Synthesis and Characterization of Nanophase γ-MnO2

LI Juan, XIA Xi, LI Qing-Wen   

  1. Institute of Applied Chemistry, Xinjiang University, Uruinqi 830046, China
  • Received:1998-08-10 Online:1999-09-24 Published:1999-09-24

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摘要： 用醋酸锰分别与柠檬酸、草酸和8-羟基喹啉在室温及低温下发生固相反应生成锰配合物,经热分解和酸处理等手段最终制备出纳米γ-MnO2用元素分析、化学分析、X射线衍射、热重/差热分析和透射电镜等测试手段对固相反应的可行性作了讨论,并对合成的样品进行了表征.从TEM照片上看,产物粒子呈球形,粒径多为20～30nm.酸处理可大大提高样品的氧化度,但酸化过程中粒子出现团聚现象,粒子形貌也有所改变,似有取向生长的趋势.文中还讨论了低温条件下利用固相反应制备纳米材料的原因.

关键词: 固相合成, 纳米材料, &gamma, -MnO2

Abstract: Manganese acetate was complexed with citric acid, oxalic acid and 8-hydroxyquinoline respectively in solid state.The resulted complex precursors were thermally decomposited and then treated with acid to obtain nanophase γ-MnO2.Their physical properties were characterized and discussed by elementary analysis, XRD, chemical analysis, TEM and TG/DTA tests.The particle sizes of samples are about 20-30 nm and their shapes are spherical-like from TEM images.The acid treatment made the oxidition of mangnese dioxide increase but nanophase samples have a little of agglomeration, the process of the acid treatment seemed to be crystalization, and the partic1es may be directional growth.The reason that nanophase materials could be systhesized with solid state reactions under the condition of room temperature or low heating was discussed.

Key words: Solid state reaction, Nanophase material, γ-Mangnese dioxide

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