Stability and hydrogen storage properties of various metal-decorated benzene complexes

被引:11
作者
Li, P. [1 ]
Deng, S. H. [2 ]
Liu, G. H. [1 ]
Zhang, L. [1 ]
Huang, J. [3 ]
Yu, J. Y. [1 ]
机构
[1] Anhui Univ Architecture, Dept Math & Phys, Hefei 230601, Peoples R China
[2] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China
[3] Anhui Univ Architecture, Sch Mat & Chem Engn, Hefei 230601, Peoples R China
基金
中国国家自然科学基金;
关键词
First-principles; Hydrogen storage; Stability; Metal-benzene complexes; AB-INITIO; 1ST-PRINCIPLES; C-60; ADSORPTION; ENERGY; WATER;
D O I
10.1016/j.jpowsour.2012.03.059
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Stability and hydrogen storage properties of various metal-decorated benzene complexes have been studied using a first-principles method. According to our results, most metals from the first to the third period of the periodic table can be strongly adsorbed on the benzene surfaces, except Be, Na, Mg, K, and Zn. Among the metals we studied Ca is the most promising adsorbate for hydrogen storage. Two Ca atoms prefer to be isolated on the benzene surfaces, one on each side, and each adsorbed Ca can adsorb up to four H-2 molecules, thus yielding a H-2 uptake of 9.2 wt%. The calculated binding energy is 0.45 eV/H-2, suitable for reversible hydrogen storage. The adsorbed Li and Sc can also adsorb a large number of H-2 molecules with suitable H-2 binding energies, but they are likely to dimerize on the benzene surfaces. Other metal adsorbates we studied are not suitable for hydrogen storage, because they will suffer from the large H-2 binding energy or the low hydrogen storage capacity. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:27 / 32
页数:6
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