Ab initio study on the adsorption of oxygen on Co(111) and its subsurface incorporation

Ab initio study on the adsorption of oxygen on Co(111) and its subsurface incorporation
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Co(111) 上氧的吸附及其地下掺入的从头算研究

DOI:
10.1140/epjb/e2014-50292-0
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发表时间:
2015-01
影响因子:
1.6
通讯作者:
X.Q. Dai
X.Q. Dai
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
S.H. Ma;Z.Y. Jiao;T.X. Wang;X.Q. Dai

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用密度泛函理论计算研究了氧在Co(111)表面的吸附及其亚表面掺入。计算的吸附能,几何和电子结构进行了讨论,与O/Co(0001)的比较。结果表明,在0.11-1.0 ML覆盖范围内,氧在Co(111)表面的hcp-空心位上的吸附是最优先的,O/Co(111)表面电子结构的变化符合Hammer-Nørskov模型.此外,目前的计算表明,氧原子结合到第一次表面层形成的O-Co-O三层的顶部Co(111),它可能会经历转化为钴的氧化物。氧在Co(111)上的行为与O/Co(0001)上的行为相似。
The adsorption of oxygen on Co(111) and its subsurface incorporation is studied by density-functional theory calculations. Calculated adsorption energies, geometries and electronic structures are discussed in comparison with that of O/Co(0001). The results indicate that oxygen adsorption in hcp-hollow sites on Co(111) are the most preferred in a coverage range of 0.11–1.0 ML, and the surface electronic structure modifications for O/Co(111) points to a consistent picture of Hammer-Nørskov model. In addition, present calculations show that oxygen atoms incorporate into the first subsurface layer forming an O-Co-O trilayer on top Co(111), which possibly undergoes conversion to cobalt oxides. The behaviors of oxygen on Co(111) are similar to that of O/Co(0001).
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发表时间: 2013-09
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