Hydrothermal preparation of nitrogen, boron co-doped curved graphene nanoribbons with high dopant amounts for high-performance lithium sulfur battery cathodes

被引:109
作者
Chen, Liang [1 ]
Feng, Jianrui [2 ]
Zhou, Haihui [1 ]
Fu, Chaopeng [1 ]
Wang, Guichang [2 ]
Yang, Liming [1 ]
Xu, Chenxi [1 ]
Chen, Zhongxue [3 ]
Yang, Wenji [1 ]
Kuang, Yafei [1 ]
机构
[1] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
[2] Nankai Univ, Synerget Innovat Ctr Chem Sci & Engn Tianjin, Minist Educ, Dept Chem,Key Lab Adv Energy Mat Chem, Tianjin, Peoples R China
[3] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China
基金
中国国家自然科学基金;
关键词
OXYGEN REDUCTION REACTION; WALLED CARBON NANOTUBES; LI-S BATTERIES; COMPOSITE; ELECTROCATALYST; HYBRID; GROWTH;
D O I
10.1039/c7ta01265a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work, we for the first time synthesized nitrogen, boron co-doped curved graphene nanoribbons (NBCGNs) by a facile hydrothermal process using oxidized curved graphene nanoribbons (O-CGNs), urea and boric acid as the carbon precursor and heteroatom sources. The influence of N and B co-doping on the morphology, structure, composition and related electrochemical performance of the NBCGNs was systematically investigated, and the results show that urea and boric acid coexisting in the hydrothermal system not only act as the N and B doping sources but also act as the catalysts to boost the synergistical doping of N and B. It is the synergistical effect of N and B co-doping that endows the NBCGNs with enlarged specific surface area as well as pore volume, improved conductivity, promoted sulfur dispersibility and strengthened adsorbability for polysulfides caused by the notably increased doped N and B contents and higher percentage of the N-B structure when compared with the counterparts. As a result, the as-prepared NBCGN/S cathode presented synergistically enhanced cyclability and rate capability. Therefore, our results not only provide a superior carbon host for Li-S batteries but also offer a common approach to the preparation of heteroatom doped carbon nanomaterials with an optimized structure and composition.
引用
收藏
页码:7403 / 7415
页数:13
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