Journal
CARBON
Volume 152, Issue -, Pages 697-703Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.06.009
Keywords
1T-molybdenum disulfide; High defect-density; Electrodes; Graphene; Supercapacitors
Funding
- National Natural Science Foundation of China [51672175, 51772187, 51271116, 51572169]
- Shanghai Science and Technology Committee [18JC1410500, 16520710900, 17ZR1441400, 17520710600, 18520744700]
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Highly defective molybdenum disulfide (MoS2) nanosheets of 1T phase are synthesized on a three-dimensional reduced graphene oxide (3D RGO) network through a one-pot hydrothermal method. By switching the reaction time, the resulting MoS2's phases (1T or 2H) and defect-density are successfully controlled. Reducing the reaction time from 20 to 6 h increases the defect-density and induces a phase transition from hybrid 2H/1T to 1T phase. High defect-density coupled with high 1T-phase portion in MoS2 nanosheets/RGO heterostructures enhances the electrochemical performance for supercapacitor application by inducing additional active sites, which provide fast charge transfer rate and a large number of ion diffusion channels. Among all samples, the defect rich 1T-phase MoS2 nanosheets/RGO heterostructure synthesized in 6 h (M/RGO-6) gives an outstanding specific capacitance of 442.0 F g(-1) at a current density of 1 A g(-1). The M/RGO-6 also exhibits excellent cycling stability with capacitance retention of 90.3% over 1000 cycles at 5 A g(-1). These make M/RGO-6 attractive to the electrode of high-performance supercapacitors. (C) 2019 Elsevier Ltd. All rights reserved.
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