期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 143, 期 -, 页码 225-231出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2017.11.019
关键词
First-principles; Energy storage properties; Electrode materials; Supercapacitors
资金
- National Nature Science Foundation of China [11547157, 51472066, 51772069, 51772070, 11504097, 11504072]
MXene has attracted significant attention as a promising electrode material for energy storage applications. In this study, the energy storage properties of Nbn+1Cn (n = 1 or 2), as a member of the MXene family, are investigated by using the first-principle density-functional theory. Bare Nb2C and Nb3C2 systems show an extremely high theoretical capacitance of Li atoms. It is determined that the surface termination has a considerable impact on the energy storage properties. The F- or O-terminated surfaces promote a charge transfer between the adatom and the surface. However, these terminations obviously reduce the electronic conductivity and the rate performance in the charge/discharge process. Moreover, the F-and OH-functional groups on the Nbn+1Cn surfaces can be removed through metal atom absorption. Our findings can be useful in designing MXene-based electrode materials for energy storage applications. (C) 2017 Elsevier B.V. All rights reserved.
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