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Issue 15, 2017
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Graphene-wrapped CNT@MoS2 hierarchical structure: synthesis, characterization and electrochemical application in supercapacitors

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Abstract

Layered transition metal dichalcogenides (TMDs) have attracted widespread 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 fading and poor cyclic stability. Herein, a hierarchical graphene-wrapped CNT@MoS2 (CMG) electrode material has been fabricated aiming at enhancing the conductivity and structural stability during continuous charge–discharge processes, thus improving its 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 10 000 cycles at a high current density of 5 A g−1), as well as improved rate performance, indicating that such a composite material is an ideal electrode material for supercapacitors. Its outstanding electrochemical performance can be ascribed to an expanded interlayer spacing of MoS2 and its unique hierarchical architecture. More importantly, this method can be readily extended to the construction of other TMD-based electrodes which were hampered in electrochemical applications owing to their poor electrical conductivity.

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

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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., 2017,41, 7142-7150
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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, 41, 7142
    DOI: 10.1039/C7NJ00623C

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