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A DFT-D study of hydrogen adsorption on functionalized graphene

机译:官能化石墨烯氢吸收的DFT-D研究

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摘要

In this paper, we use density functional theory with dispersion correction functional (DFT-D) as implemented in the Vienna ab initio simulation package in order to investigate hydrogen adsorption on graphene (GH) and fluorographene (GF). The adsorption sites at different surface coverage rates were studied to determine the most stable configurations. The comparison between the results obtained using standard pure DFT functionals and dispersion corrected ones highlight the role of the dispersion effect in the adsorption energies and the orientation of the molecules relative to the surface. The coverage rate is found to increase up to 75% on the two sides, making these nanoporous materials promising candidates for hydrogen storage. Electronic properties such as density of states and band structures were calculated on both GH and GF systems. It is observed that after H-2 adsorption the band gap of GH is only slightly modified, whereas the opposite trend is observed on GF.
机译:在本文中,我们使用具有色散校正功能(DFT-D)的密度泛函理论,如维也纳AB初始仿真包装中所实施的,以研究石墨烯(GH)和荧光蛋白(GF)上的氢吸附。 研究了不同表面覆盖率的吸附位点以确定最稳定的配置。 使用标准纯DFT功能和色散校正的结果之间的比较突出了色散效应在吸附能量中的作用和分子相对于表面的取向。 发现覆盖率在两侧增加高达75%,使这些纳米多孔材料具有储氢候选者。 在GH和GF系统上计算了诸如状态密度和带结构的电子性质。 观察到,在H-2吸附后,GH的带隙仅略微修改,而在GF上观察到相反的趋势。

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  • 来源
    《RSC Advances》 |2015年第19期|共7页
  • 作者单位

    Univ Paris Diderot Sorbonne Paris Cite ITODYS UMR CNRS 7086 F-75205 Paris 13 France;

    Univ Paris Diderot Sorbonne Paris Cite ITODYS UMR CNRS 7086 F-75205 Paris 13 France;

    Univ Paris 06 Univ Paris 04 UMR 7574 Lab Chim Matiere Condensee Coll France F-75231 Paris 05 France;

    Univ Paris Diderot Sorbonne Paris Cite ITODYS UMR CNRS 7086 F-75205 Paris 13 France;

    IPEST La Marsa Lab Physicochim Microstruct &

    Microsyst Carthago Tunisia;

    Ecole Natl Super Chim Paris CNRS ENSCP IRCP F-75005 Paris France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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