Calcium-decorated graphene for hydrogen storage: A van der Waals density functional study

Calcium-decorated graphene for hydrogen storage: A van der Waals density functional study
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用于储氢的钙装饰石墨烯:范德华密度泛函研究

DOI:
10.1016/j.commatsci.2011.12.006
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发表时间:
2012-04
影响因子:
3.3
通讯作者:
Kawazoe, Y.
Kawazoe, Y.
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang, V.;Mizuseki, H.;He, H. P.;Chen, G.;Zhang, S. L.;Kawazoe, Y.

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采用最近发展起来的货车德瓦尔斯密度泛函[vdW-DF,M. Dion等人,物理修订信函92(2004)246401]。我们的vdW-DF计算表明,覆盖率为33.4%的Ca修饰的石墨烯只能储存2.6wt.%氢。相对于传统的局域和半局域近似,vdw-DF显著改善了Ca与石墨烯结合强度的低估(高估)以及H2分子在Ca修饰的石墨烯上的吸附能.
The hydrogen storage of Ca-decorated graphene is studied by using a recently developed van der Waals density functional [vdW-DF, M. Dion, et al., Phys. Rev. Lett. 92 (2004) 246401]. Our vdW-DF calculations show that Ca-decorated graphene with a coverage of 33.4% can only store 2.6wt.% of hydrogen. vdW-DF significantly improves the underestimation (overestimation) of binding strength of Ca with graphene as well as the adsorption energies of H2molecules on Ca-decorated graphene with respect to the conventional local and semilocal approximations.
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