高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (10): 2131.doi: 10.7503/cjcu20140508

• 物理化学 • 上一篇    下一篇

不同金属外掺杂富勒烯C20M(M=Li, Ti, Fe)的储氢性能

王成杰, 唐春梅(), 张轶杰, 高凤志   

  1. 河海大学理学院, 南京 210098
  • 收稿日期:2014-06-04 出版日期:2014-10-10 发布日期:2014-09-15
  • 作者简介:联系人简介: 唐春梅, 女, 博士, 教授, 主要从事纳米材料物理化学特性研究. E-mail: tcmnj@163.com.
  • 基金资助:
    国家自然科学基金(批准号: 11104062, 1094713)和河海大学创新训练项目(批准号: 2014102941048)资助

Hydrogen Storage of the Different Kinds of Metal Atoms Coated Fullerene C20M(M=Li, Ti, Fe)

WANG Chengjie, TANG Chunmei*(), ZHANG Yijie, GAO Fengzhi   

  1. College of Science, Hohai University, Nanjing 210098, China
  • Received:2014-06-04 Online:2014-10-10 Published:2014-09-15
  • Contact: TANG Chunmei E-mail:tcmnj@163.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.11104062, 10947132), Hohai University Innovation Training Project, China(No.2014102941048)

摘要:

使用密度泛函理论(DFT)中的广义梯度近似(GGA)对经碱金属原子Li、 过渡金属原子Ti和Fe修饰的富勒烯C20M(M=Li, Ti, Fe)的储氢性能进行研究. 结果表明, C20Li(C20Ti 和C20Fe)能够吸附H2的最大数目为6, 6和4, 与18电子规则相吻合; C20M(M=Li, Ti, Fe)对H2的平均吸附能在0.25~0.80 eV范围内, 介于物理吸附和化学吸附之间(0.1~0.8 eV), 因此可以实现常温下对氢的可逆吸附. C20Li主要通过正负电荷形成的偶极矩作用进行储氢, 而C20Ti和C20Fe主要通过Dewar-Kubas作用进行储氢.

关键词: 富勒烯C20, 金属掺杂富勒烯, C20Li, C20Ti, C20Fe, 储氢性能, 密度泛函理论

Abstract:

The hydrogen storage ability of the alkali metal atom Li, transition metal atom Ti and Fe decorated fullerene C20M was studied with the generalized gradient approximation of the density functional theory. Geo-metry optimization shows that the most stable adsorption position of the metal atom is located above the bridge site of the C—C bond of C20. It is known from the average adsorption energy that the maximum numbers of H2 adsorbed on the C20M(M=Li, Ti, Fe) are 6, 6 and 4, respectively. They agree well with the 18 electronic rule. The average adsorption energies of C20M-nH2 are in the range from 0.25 eV to 0.8 eV, between physical adsorption and chemical adsorption(0.1—0.8 eV), so it can realize the reversible adsorption of H2. C20Li mainly through the dipole moment formed of positive and negative charge to adsorb H2 molecules, while C20Ti and C20Fe adsorb H2 mainly through Dewar-Kubas role.

Key words: Fullerene C20, Metal atom coated fullerene, C20Li, C20Ti, C20Fe, Hydrogen storage, Density functional theory

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