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H-2 dissociative adsorption at the armchair edges of graphite

机译:H-2在石墨扶手椅边缘的解离吸附

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We investigate and discuss how hydrogen behaves at the edges of a graphite sheet, in particular the armchair edge. Our density functional theory-based calculations results show that, in contrast to the zigzag edge [W.A. Di (n) over tildeH. Nakanishi, H. Kasai, T. Sugimoto, T. Kondoe, e-J. Surf. Sci. Nanotech. 2 (2004) 77. [25]], regardless of orientation, there is an activation barrier hindering H-2 dissociation at the armchair edges. And once they do get dissociatively adsorbed at the armchair edges, we find that it would be extremely hard to desorb the H from their adsorption sites at the armchair edges. Furthermore, we also found that, consistent with our earlier conclusions [W.A. Di (n) over tildeo, Y. Miura, H. Nakanishi, H. Kasai, T. Sugimoto, J. Phys. Soc. Jpn. 72 (2003) 1867. [24]], it is unlikely that we would find a whole H-2 in between plain graphite sheets. (C) 2004 Elsevier Ltd. All rights reserved.
机译:我们研究并讨论了氢如何在石墨片的边缘,特别是扶手椅边缘发生反应。我们基于密度泛函理论的计算结果表明,与之字形边缘相比[W.A. Di(n)超过tildeH。 Nakanishi,H.Kasai,T.Sugimoto,T.Kondoe,e-J。冲浪。科学纳米技术。 [2](2004)77. [25]],无论定向如何,在扶手椅边缘都有一个阻碍H-2分解的活化屏障。并且一旦它们确实解离地吸附在扶手椅的边缘,我们发现很难从扶手椅边缘的吸附位置解吸H。此外,我们还发现,这与我们先前的结论[W.A. Di(n)over tildeo,Y。Miura,H。Nakanishi,H。Kasai,T。Sugimoto,J。Phys。 Soc。日本。 72(2003)1867. [24]],我们不太可能在普通石墨片之间找到整个H-2。 (C)2004 Elsevier Ltd.保留所有权利。

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