双空位缺陷双层石墨烯储钠性能的第一性原理研究

引用本文: 杨绍斌, 李思南, 沈丁, 唐树伟, 孙闻, 陈跃辉. 双空位缺陷双层石墨烯储钠性能的第一性原理研究[J]. 物理化学学报, 2017, 33(3): 520-529. doi: 10.3866/PKU.WHXB201611151 shu

Citation: YANG Shao-Bin, LI Si-Nan, SHEN Ding, TANG Shu-Wei, SUN Wen, CHEN Yue-Hui. First-Principles Study of Na Storage in Bilayer Graphene with Double Vacancy Defects[J]. Acta Physico-Chimica Sinica, 2017, 33(3): 520-529. doi: 10.3866/PKU.WHXB201611151 shu

双空位缺陷双层石墨烯储钠性能的第一性原理研究

杨绍斌 ^1, ,
李思南 ^2, ,
沈丁 ^1, ,
唐树伟 ^3, ,
孙闻 ^1, ,
陈跃辉 ^4,

1.
辽宁工程技术大学材料科学与工程学院, 辽宁阜新 123000;
2.
辽宁工程技术大学矿业学院, 辽宁阜新 123000;
3.
东北师范大学化学学院, 长春 130024;
4.
辽宁工程技术大学理学院, 辽宁阜新 123000
基金项目:
国家自然科学基金（51274119，21503039）资助项目

摘要: 采用基于密度泛函理论（DFT）的色散修正方法，研究了Na吸附和嵌入在双空位缺陷（DV）双层石墨烯（BLG）体系中的形成能、电荷转移、电极电势和扩散行为。形成能计算表明，无论单个Na原子在BLG表面吸附还是层间嵌入，均在DV空位中心处更稳定。电荷密度分布和Bader电荷计算表明Na与BLG的结合方式表现出离子性。Na嵌入DV缺陷BLG层间，缺陷浓度增加使BLG由AB堆垛向AA堆垛转变过程推迟；使Na在DV缺陷BLG的表面和层间能够稳定储钠的容量之和增至262.75 mAh·g^-1，对应浓度Na与C摩尔比为2：17，储钠浓度继续增加，Na在BLG表面吸附容易产生枝晶或团簇。当层间嵌入Na原子时，表面Na原子向DV缺陷中心方向扩散能垒减小、表面Na原子沿相反方向的扩散能垒增加，DV缺陷的存在提高了BLG表面捕获Na的能力。

关键词:

English

First-Principles Study of Na Storage in Bilayer Graphene with Double Vacancy Defects

1.
College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning Province, P. R. China;
2.
College of Mining, Liaoning Technical University, Fuxin 123000, Liaoning Province, P. R. China;
3.
Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China;
4.
College of Science, Liaoning Technical University, Fuxin 123000, Liaoning Province, P. R. China
Received Date: 25 July 2016
Revised Date: 14 November 2016
Fund Project:
The project was supported by the National Natural Science Foundation of China (51274119,21503039)

Abstract: Based on density functional theory (DFT) with the dispersion correction method, the formation energies, charge transfer, cell potential, and migration process for Na storage in bilayer graphene (BLG) with double vacancy (DV) defects were studied. The formation energy results indicate that one Na atom adsorption or intercalation on or into the center of the vacancy is more favorable. The charge density distribution and Bader charge results indicate that the interactions between Na atoms and BLG are ionic. During Na intercalation in DV defective BLG, the transformation from AB to AA stacking may be delayed as the defect density is increased, and the stable capacity increases to 262.75 mAh·g^-1 (Na:C mole ratio=2:17) for Na adsorption on the surface and intercalation into the interlayer of BLG with DV defects. With increasing Na concentration, Na atoms on the surface tend to aggregate into clusters and eventually macroscopic dendrites. The diffusion energy barrier is increased for adsorbed Na on the surface migrating toward the center of DV defects, while that for the reverse direction is decreased by the intercalated Na atoms, which enhances the storage of Na on the surface of BLG with DV defects.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

双空位缺陷双层石墨烯储钠性能的第一性原理研究

English

First-Principles Study of Na Storage in Bilayer Graphene with Double Vacancy Defects

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双空位缺陷双层石墨烯储钠性能的第一性原理研究

English

First-Principles Study of Na Storage in Bilayer Graphene with Double Vacancy Defects

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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