One-pot synthesis of molybdenum disulfide–reduced graphene oxide (MoS2-RGO) composites and their high electrochemical performance as an anode in lithium ion batteries

• Published in: The Journal of supercritical fluids 2017-09, Vol.127, p.81-89
• Main Authors: Choi, Mugyeom, Hwang, Jieun, Setiadi, Handi, Chang, Wonyoung, Kim, Jaehoon
• Format: Article
• Language: English
• Subjects: Composites; Lithium-ion batteries; Molybdenum disulfide; Reduced graphene oxide; Supercritical ethanol
• ISSN: 0896-8446; 1872-8162
• DOI: 10.1016/j.supflu.2017.04.003

[Display omitted] •One-pot, fast, green supercritical ethanol route to synthesize MoS2-RGO composites.•MoS2 is tightly anchored and uniformly deposited on the RGO surface.•MoS2-RGO exhibits mesoporous structure with high porosity and conductivity.•MoS2-RGO exhibits high reversible capacity of 1102mAg−1 at 50mAg−1.•Excellent high-rate performance of 469mAhg−1 at 2.5Ag−1 resulted. A simple, effective, and ultra-fast one-pot route is developed to synthesize molybdenum disulfide (MoS2)-reduced graphene oxide (RGO) composites. The method to tightly anchor MoS2 particles on the surface of RGO includes simultaneous reduction of graphene oxide (GO) and heterogeneous nucleation and growth of MoS2 on the RGO surface in supercritical ethanol (scEtOH) medium. The synthesized MoS2-RGO composites have a mesoporous structure with high porosity. The MoS2-RGO composites show an enhanced electrochemical performance due to their unique nanostructure and the synergetic effect of MoS2 and RGO nanosheets when compared to those of compared with bare MoS2 and bare RGO. The MoS2-RGO composite with a MoS2 loading of 74.0wt% can deliver a high reversible discharge capacity up to 1102mAhg−1 at a rate of 0.05Ag−1 after 80 cycles and an excellent cycling stability of 951mAhg−1 at 0.05Ag−1 after 140 cycles.