Premium
Strong Coupling of MoS 2 Nanosheets and Nitrogen‐Doped Graphene for High‐Performance Pseudocapacitance Lithium Storage
Author(s) -
Lei Zhendong,
Xu Laiqiang,
Jiao Yalong,
Du Aijun,
Zhang Yong,
Zhang Haijiao
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201704410
Subject(s) - pseudocapacitance , materials science , graphene , anode , lithium (medication) , nanotechnology , composite number , chemical engineering , electrode , supercapacitor , capacitance , composite material , chemistry , medicine , endocrinology , engineering
Layered material MoS 2 is widely applied as a promising anode for lithium‐ion batteries (LIBs). Herein, a scalable and facile dopamine‐assisted hydrothermal technique for the preparation of strongly coupled MoS 2 nanosheets and nitrogen‐doped graphene (MoS 2 /N‐G) composite is developed. In this composite, the interconnected MoS 2 nanosheets are well wrapped onto the surface of graphene, forming a unique veil‐like architecture. Experimental results indicate that dopamine plays multiple roles in the synthesis: a binding agent to anchor and uniformly disperse MoS 2 nanosheets, a morphology promoter, and the precursor for in situ nitrogen doping during the self‐polymerization process. Density functional theory calculations further reveal that a strong interaction exists at the interface of MoS 2 nanosheets and nitrogen‐doped graphene, which facilitates the charge transfer in the hybrid system. When used as the anode for LIBs, the resulting MoS 2 /N‐G composite electrode exhibits much higher and more stable Li‐ion storage capacity (e.g., 1102 mAh g −1 at 100 mA g −1 ) than that of MoS 2 /G electrode without employing the dopamine linker. Significantly, it is also identified that the thin MoS 2 nanosheets display outstanding high‐rate capability due to surface‐dominated pseudocapacitance contribution.