title: A simple L-cysteine-assisted method for the growth of MoS2 nanosheets on carbon nanotubes for high-performance lithium ion batteries.
abstract: We introduce a simple process to synthesize few-layered MoS(2) nanosheets supported on coaxial carbon nanotubes through an L-cysteine-assisted hydrothermal route, in which L-cysteine, a cheap and ordinary amino acid, plays a fundamental role in controlling the morphology of the hybrid material and the binder to help the growth of MoS(2) nanosheets on the surface of the carbon nanotubes. It is also demonstrated that the polypeptide formed by L-cysteine can be transformed into amorphous carbon by heat treatment under an inert atmosphere. The materials exhibit high capacity and excellent cycling performance when used as anode materials for lithium ion batteries. The specific capacity of a composite with 1 : 4 molar ratio of MoS(2) to carbon nanotubes is 736.5 mAh g(-1) after the first cycle, increased for several initial cycles, and remains at 823.4 mAh g(-1) even after 30 cycles, when cycled at a current density of 100 mA g(-1). At a very high current density of 1600 mA g(-1), the material shows a stable capacity of approximately 530 mAh g(-1) after 30 cycles. The noteworthy improvement in the electrochemical performance of the material can be attributed to their unique structure and the synergistic effects of amorphous carbon and few-layered MoS(2).
authors.affiliation: Department of Nano Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Suwon, 443-270, Republic of Korea.
authors.forename: Seung-Keun
authors.initials: SK
authors.lastname: Park
authors.forename: Seung-Ho
authors.initials: SH
authors.lastname: Yu
authors.forename: Seunghee
authors.initials: S
authors.lastname: Woo
authors.forename: Bo
authors.initials: B
authors.lastname: Quan
authors.forename: Dong-Chan
authors.initials: DC
authors.lastname: Lee
authors.forename: Min Kun
authors.initials: MK
authors.lastname: Kim
authors.forename: Yung-Eun
authors.initials: YE
authors.lastname: Sung
authors.forename: Yuanzhe
authors.initials: Y
authors.lastname: Piao
mesh_terms: D003545:Cysteine / Q000737:chemistry*; D004220:Disulfides / Q000737:chemistry*; D011211:Electric Power Supplies; D004566:Electrodes; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D008982:Molybdenum / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties
chemical_list: D004220:Disulfides; D007477:Ions; D037742:Nanotubes, Carbon; D008982:Molybdenum; D008094:Lithium; D003545:Cysteine; C082964:molybdenum disulfide