Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 41, Pages 35571-35579Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b09085
Keywords
MoS2/PEI-GO composites; exfoliation; opposite charge; supercapacitor; electrostatically charged interaction
Funding
- National Natural Science Foundation of China [21403099]
- Natural Science Funds for Distinguished Young Scholars of Gansu Province [1606RJDA320]
- Ministry of Science and Technology [107-2923-E-007-002-MY3, 107-2112-M-007-030-MY3, 106-2923-E-007-006-MY2, 105-2119-M-009-009, 107-3017-F-007-002]
- National Tsing Hua University [105A0088J4]
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We demonstrate, for the first time, a new method of fabricating hybrid MoS2/poly(ethyleneimine)-modified graphene oxide (PEI-GO) composites assembled through electrostatically charged interaction between the negatively charged MoS2 nanosheets and positively charged PEI-GO in an aqueous solution. The GO can not only improve the electronic conductivity of the MoS2/PEI-GO composites, leading to an excellent charge-transfer network, but also hamper the restacking of MoS2 nanosheets. The composition ratios between MoS2 and PEI-GO were also optimized with the highest specific capacitance of 153.9 F g(-1) where 96.0% of the initial specific capacitance remains after 6800 cycles. The specific capacitance of only 117.5 F g(-1) was observed for the pure MoS2 nanosheets, and 68.2% of the initial specific capacitance was achieved after 5000 cycles. The excellent electrochemical performance of the hybrid MoS2/PEI-GO composites was demonstrated by establishing an asymmetric supercapacitor with a MoS2/PEI-GO-based negative electrode and an activated-carbon positive electrode. The asymmetric supercapacitor provided a maximum capacitance of 42.9 F g(-1), and 93.1% of the initial capacitance was maintained after 8000 cycles. Furthermore, a MoS2/PEI-GO//activated-carbon asymmetric supercapacitor delivered an energy density of 19.3 W h kg(-1) and a power density of 4500 W kg(-1), indicating the potential of the hybrid MoS2/PEI-GO composites in electrochemical energy storage applications.
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