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[求助]
掺氮石墨烯表面吸附Li5O6,迟豫后结果与文献中不一致 已有1人参与
在优化后的掺氮石墨烯表面放置吸附的Li5O6,放置的位置是2.08A高,迟豫后结果与文献中不一致,最底部的Li原子与N,C原子并没形成文献中的这个结构,从文献的图中看是Li原子和N,C原子都成键了,文献原文是:
Similarly with our previous calculated model, a cluster of Li5O6 is put on the surface of the doped graphene material to explore the OER mechanism of the Li–air battery.23 The Li5O6 was taken from the most stable surface (0001) of Li2O2 bulk. Our geometrical optimization and frequency calculations indicate that Li5O6 is stable with no imaginary frequency, which may be a reasonable model to simulate the OER mechanism of nanoscale Li2O2 in the Li–air battery. Considering Li2O2 as the discharge product and the initial reactant of the OER, some possible structures of Li5O6 clusters adsorbed on X-doped graphene are calculated by rotating Li5O6 clusters to form different contact angles. The most stable structures of Li5O6 adsorbed on X-doped graphene substrates (X = B, N, Si, Al, and P) are displayed in Fig. 1(d)–(h),
文献图(掺氮石墨烯,图d):

MedeA中迟豫后的结构:

不知道这跟我没有把最下面的锂原子放置高度超过了N和Li原子的共价半径之和1.98A有关?
另外还有两个问题:
1. 文献中说最稳定的结构是通过旋转Li5O6,那么这个最稳定结构是吸附能最低的结构吗?又是如何旋转呢?还是在vasp中迟豫就可以?
2.vasp计算中我的k-mesh in Brillouin Zone都是设置的3*3*1,请问这个设置是否合理?
论文和OUTCAR文件在下面。 |
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