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国家自然科学基金(11074211)

作品数:3 被引量:4H指数:1
发文基金:国家自然科学基金国家重点基础研究发展计划国家教育部博士点基金更多>>
相关领域:理学一般工业技术电气工程更多>>

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Spin gapless armchair graphene nanoribbons under magnetic field and uniaxial strain
2013年
Using Green's function method, we investigate the spin transport properties of armchair graphene nanoribbons (AG- NRs) under magnetic field and uniaxial strain. Our results show that it is very difficult to transform narrow AGNRs directly from semiconductor to spin gapless semiconductors (SGS) by applying magnetic fields. However, as a uniaxial strain is exerted on the nanoribbons, the AGNRs can transform to SGS by a small magnetic field. The combination mode be- tween magnetic field and uniaxial strain displays a nonmonotonic arch-pattern relationship. In addition, we find that the combination mode is associated with the widths of nanoribbons, which exhibits group behaviors.
侯海平谢月娥陈元平欧阳滔葛青霞钟建新
关键词:GRAPHENETIGHT-BINDING
Carbon matrix/SiNWs heterogeneous block as improved reversible anodes material for lithium ion batteries
2014年
A novel carbon matrix/silicon nanowires(SiNWs) heterogeneous block was successfully produced by dispersing SiNWs into templated carbon matrix via a modified evaporation induced self-assembly method. The heterogeneous block was determined by X-ray diffraction, Raman spectra and scanning electron microscopy. As an anode material for lithium batteries, the block was investigated by cyclic voltammograms(CV), charge/discharge tests, galvanostatic cycling performance and A. C. impedance spectroscopy. We show that the SiNWs disperse into the framework, and are nicely wrapped by the carbon matrix. The heterogeneous block exhibits superior electrochemical reversibility with a high specific capacity of 529.3 mAh/g in comparison with bare SiNWs anode with merely about 52.6 mAh/g capacity retention. The block presents excellent cycle stability and capacity retention which can be attributed to the improvement of conductivity by the existence of carbon matrix and the enhancement of ability to relieve the large volume expansion of SiNWs during the lithium insertion/extraction cycle. The results indicate that the as-prepared carbon matrix/SiNWs heterogeneous block can be an attractive and potential anode material for lithium-ion battery applications.
Yao WangLong RenYundan LiuXuejun LiuKai HuangXiaolin WeiJun LiXiang QiJianxin Zhong
Hydrothermal exfoliated molybdenum disulfide nanosheets as anode material for lithium ion batteries被引量:4
2014年
Ultrathin MoS2 nanosheets were prepared in high yield using a facile and effective hydrothermal intercalation and exfoliation route. The products were characterized in detail using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The results show that the high yield of MoS2 nanosheets with good quality was successfully achieved and the dimensions of the immense nanosheets reached 1 μm-2/zm. As anode material for Li-ion batteries, the as-prepared MoS2 nanosheets electrodes exhibited a good initial capacity of 1190 mAh.g-l and excellent cyclic stability at constant current density of 50 mA.g-1. After 50 cycles, it still delivered reversibly sustained high capacities of 750 mAh.g-1.
Yundan LiuLong RenXiang QiLiwen YangJun LiYao WangJianxin Zhong
关键词:NANOSHEETSEXFOLIATION
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