1T-MoS2 nanotubes wrapped with N-doped graphene as highly-efficient absorbent and electrocatalyst for Li-S batteries

JOURNAL OF POWER SOURCES

卷:447

Article

Yu, Bo¹  Chen, Yuanfu^1,2  Wang, Zegao^3,4  Chen, Dongjiang⁵  Wang, Xinqiang¹  Zhang, Wanli¹  He, Jiarui^6,7  He, Weidong⁵ 

[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Sch Elect Sci & Engn, Chengdu 610054, Sichuan, Peoples R China

[2] Tibet Univ, Sch Sci, Dept Phys, Lhasa 850000, Peoples R China

[3] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus C, Denmark

[4] Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610065, Sichuan, Peoples R China

[5] Univ Elect Sci & Technol China, Sch Phys, Chengdu 611731, Sichuan, Peoples R China

[6] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[7] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA

关键词: Spray-dried;    N-doped graphene;    1T MoS2 nanotubes;    Electrocatalyst;    Li-S batteries;   

DOI  :  10.1016/j.jpowsour.2019.227364

来源: Elsevier

【 摘 要 】

A novel three-dimensional porous graphene/MoS2 hybrid is synthesized through a facile spray-drying approach. This hybrid is constructed with two-dimensional N-doped graphene nanosheets wrapping one-dimensional nanotubes self-assembled by vertically oriented few-layered 1T-MoS2. Due to its well-designed nanoarchitecture, the hybrid owns several advantages: the metallic 1T-MoS2 and highly conductive graphene skeleton facilitates electron transfer; with abundant specific area and electrocatalytic active sites, the unique hollow nano architecture enables efficient electrolyte infiltration and Li-ion transfer. The experiments of lithium polysulfides adsorption and in-situ Raman spectra confirm that the hybrid acts as both excellent chemical absorbant and high-efficiency electrocatalyst for the transition of long-chain lithium polysulfides. Benefiting from these merits, the cathode delivers outstanding electrochemical properties with a superior reversible capacity of 1219 mAh g(-1) (after 200 cycles at 0.2 C), a low long-term cycling capacity decay of 0.039% per cycle (500 cycles at 1 C), and excellent rate performances.

【 授权许可】

Free