Molybdenum Disulfide Nanosheets Interconnected Nitrogen-Doped Reduced Graphene Oxide Hydrogel: A High-Performance Heterostructure for Lithium-Ion Batteries. (1st March 2016)

• Record Type: Journal Article
• Authors: Lingappan, Niranjanmurthi; Kang, Dae Joon
• Is Part Of: Electrochimica acta. Volume 193(2016)
• Page Start: 128
• Page End: 136
• Publication Date: 2016-03-01
• Subjects: Molybdenum disulphide -- Nitrogen doped Graphene -- Hierarchical structure -- Power density -- Lithium ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.02.062
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: MoS2 /n-RGO hybrid was synthesized by two-step hydrothermal process. The structure and morphology were investigated in detail. Hybrid manifests excellent electrochemical properties. It also exhibits high energy and power densities. Abstract: We demonstrate an efficient and large-scale synthesis approach of a novel heterostructure comprised of molybdenum disulfide (MoS2 ) and nitrogen-doped reduced graphene oxide (n-RGO) hydrogel (MoS2 /n-RGO) via two-step hydrothermal process. Due to the strong molybdenum–nitrogen (Mo−N) bond, the n-RGO sheets are well interconnected to the MoS2 sheets and restacking of the two components is minimized. The hybrid possesses an open-pore structure, large surface area, and high nitrogen content. As an anode for lithium-ion batteries, the MoS2 /n-RGO manifests a high specific capacity of 1140 mA h g −1 at the current density of 100 mA g −1, which is higher than that of the MoS2 /non-doped RGO (MoS2 /RGO) counterpart. A remarkable rate capability and excellent electrochemical stability (94% retention after 130 cycles) is also achieved. Furthermore, the MoS2 /n-RGO hybrid delivers a maximum energy density of 890 Wh kg −1 with the power density of 130 W kg −1 . The superior electrochemical performance can be attributed to the durability and improved charge kinetics of the MoS2 /n-RGO heterostructure owing to the nitrogen-doping effect. This study sheds light on the importance of a nitrogen-doped architecture in the creation of novel functional materials that can act as advanced electrodes for lithium-ion batteries.