高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (6): 1235.

• 研究论文 • 上一篇    下一篇

H2分子在碱金属掺杂碳纳米管上的吸附特性

陈媛梅1, 李卿2, 黄元河2   

  1. 1. 北京林业大学理学院, 北京 100083;
    2. 北京师范大学化学学院, 北京 100875
  • 收稿日期:2009-10-27 出版日期:2010-06-10 发布日期:2010-06-10
  • 通讯作者: 黄元河, 男, 教授, 主要从事大分子和固体量子化学研究. E-mail: yuanhe@bnu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20873009)资助.

Properties of H2 Adsorption on the Alkali-metal-doped Carbon Nanotube

CHEN Yuan-Mei1, LI Qing2, HUANG Yuan-He2*   

  1. 1. College of Science, Beijing Forestry University, Beijing 100083, China;
    2. College of Chemistry, Beijing Normal University, Beijing 100875, China
  • Received:2009-10-27 Online:2010-06-10 Published:2010-06-10
  • Contact: HUANG Yuan-He. E-mail: yuanhe@bnu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20873009)资助.

摘要:

采用密度泛函理论研究了H2在碱金属(M=Li, K)掺杂的扶手椅型单壁碳纳米管上的吸附. 对于碱金属管内掺杂, 模拟了4种氢吸附构型; 对于管外掺杂, 考虑了两种吸附结构, 同时还考虑了两种不同的掺杂浓度. 所有吸附模型都进行了全优化. 计算结果表明, 碱金属掺杂后, 碱金属与碳纳米管之间发生电子授受作用使得碱金属带正电荷, 对于金属Li, 管内掺杂更有利于电子向碳纳米管转移; 与管内掺杂相比, Li原子的管外掺杂更有利于H2分子吸附. 碱金属管外掺杂的碳纳米管吸附H2的最稳定结构, 存在碱金属原子与H2分子的配位作用.

关键词: 碱金属掺杂碳纳米管; 氢分子吸附; 密度泛函理论

Abstract:

The H2 adsorption on the alkali-metal-doped armchair single-walled carbon nanotube was investigated using density functional theory(DFT) with full geometric optimization. The alkali metal doping both inside and outside the tube are considered. The calculations show that the electrons are transferred from the doped alkali-metal atoms to the carbon nanotube. Compared with the alkali-metal atom doping into the tube inside, the doping of alkali-metal atoms on the wall outside is more favorable to the H2 adsorption. It is found that the coordination interaction between the H2 and the nanotube exists in the most stable structure for the H2 adsorption.

Key words: Alkali-metal-doped carbon nanotube; Adsorption of hydrogen molecule; Density functional theory

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