TiC2: a new two-dimensional sheet beyond MXenes

被引：200
作者：
Zhao, Tianshan [1 ,2 ,3 ]
Zhang, Shunhong [1 ,2 ,3 ]
Guo, Yaguang [1 ,2 ,3 ]
Wang, Qian [1 ,2 ,3 ]
机构：
[1] Peking Univ, Coll Engn, Ctr Appl Phys & Technol, Beijing 100871, Peoples R China
[2] Minist Educ, IFSA Collaborat Innovat Ctr, Beijing 100871, Peoples R China
[3] Minist Educ, Key Lab High Energy Dens Phys Simulat, Beijing 100871, Peoples R China
来源：
NANOSCALE | 2016年 / 8卷 / 01期
基金：
中国国家自然科学基金;
关键词：
TRANSITION-METAL CARBIDES; ELECTRONIC-PROPERTIES; TI8C12; METALLOCARBOHEDRYNES; BUILDING-BLOCKS; CARBON; GRAPHENE; INTERCALATION; CARBOHEDRENES; NANOCRYSTALS; REACTIVITY;
D O I：
10.1039/c5nr04472c
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
MXenes are attracting attention due to their rich chemistry and intriguing properties. Here a new type of metal-carbon-based sheet composed of transition metal centers and C-2 dimers rather than individual C atom is designed. Taking the Ti system as a test case, density functional theory calculations combined with a thermodynamic analysis uncover the thermal and dynamic stability of the sheet, as well as a metallic band structure, anisotropic Young's modulus and Poisson's ratio, a high heat capacity, and a large Debye stiffness. Moreover, the TiC2 sheet has an excellent Li storage capacity with a small migration barrier, a lower mass density compared with standard MXenes, and better chemical stability as compared to the MXene Ti2C sheet. When Ti is replaced with other transition metal centers, diverse new MC2 sheets containing C=C dimers can be formed, the properties of which merit further investigation.
引用
收藏
页码：233 / 242
页数：10
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