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Graphene-wrapped CNT@MoS2 hierarchical structure: synthesis, characterization and electrochemical application in supercapacitors

Abstract

Layered transition metal dichalcogenides (TMDs) have attracted broad attention for developing electrochemical energy storage due to their unique graphite-like structure and high theoretical capacity. However, the semiconductor character of TMDs affects their electrical conductivity, causing low specific capacitance, rapid capacity fade and poor cyclic stability. Herein, hierarchical graphene-wrapped CNT@MoS2 (CMG) electrode material has been fabricated aiming at enhancing the conductivity and structural stability during the continuous charge-discharge processes, thus improving the electrochemical properties. As a novel electrode material, the prepared CMG electrode delivers a high specific capacitance of 498 F∙g-1 and excellent long-term cycle-life stability (only 5.7% loss of its initial capacitance after 10000 cycles at a high current density of 5 A∙g-1), as well as improved rate performance, indicating such composite material is an ideal electrode material for supercapacitors. The outstanding electrochemical performance can be ascribed to the expanded interlayer spacing of MoS2 and the unique hierarchical architecture. More importantly, this method can be readily extended to the construction of other TMDs-based electrodes which were hampered in electrochemical applications for their poor electrical conductivity.

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Supplementary files

Publication details

The article was received on 21 Feb 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00623C
Citation: New J. Chem., 2017, Accepted Manuscript
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    Graphene-wrapped CNT@MoS2 hierarchical structure: synthesis, characterization and electrochemical application in supercapacitors

    T. Sun, X. Liu, Z. Li, L. Ma, J. Wang and S. Yang, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00623C

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