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Accelerating Dynamics of H on Graphene by Coadsorbates

机译:加入辅作液加速石墨烯的动力学

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摘要

There are several factors that affect the dynamics of adsorbed hydrogen atoms on a carbon surface. Using density functional calculations we show that coadsorption can be a highly influential factor. The diffusion of hydrogen adsorbed on graphene is, explored in the presence of H-containing molecules. Without coadsorbates the diffusion barrier of H on graphene is 0.94 eV, while with water/ammonia it is 0.85/0.12 eV. The low barrier in the case of ammonia is attributed to the formation of a stable intermediate state NH4, while such a stable state is not found in the case of water. In addition, hydrogen fluoride, hydrogen sulfide, arsine, and phosphine were also considered. We found that stronger hydrogen-hydride bonds lead to lower diffusion barriers of H on graphene.
机译:有几个因素会影响碳表面上吸附的氢原子的动态。 使用密度函数计算,我们表明加入吸附可以是一种高度影响力的因素。 在含H分子存在下探讨了吸附在石墨烯上的氢的扩散。 没有辅作吸收剂,H在石墨烯上的扩散屏障为0.94eV,而水/氨是0.85 / 0.12eV。 在氨的情况下,低屏障归因于形成稳定的中间状态NH4,而在水的情况下找不到这种稳定状态。 此外,还考虑了氟化氢,硫化氢,胂和膦。 我们发现,较强的氢化氢键导致石墨烯的低扩散屏障。

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