In-situ synthetize multi-walled carbon nanotubes@MnO2 nanoflake core–shell structured materials for supercapacitors

Zheng, Huajun, Wang, Jiaoxia, Jia, Yi and Ma, Chun'an (2012) In-situ synthetize multi-walled carbon nanotubes@MnO2 nanoflake core–shell structured materials for supercapacitors. Journal of Power Sources, 216 508-514. doi:10.1016/j.jpowsour.2012.06.047


Author Zheng, Huajun
Wang, Jiaoxia
Jia, Yi
Ma, Chun'an
Title In-situ synthetize multi-walled carbon nanotubes@MnO2 nanoflake core–shell structured materials for supercapacitors
Formatted title
In-situ synthetize multi-walled carbon nanotubes@MnO2 nanoflake core–shell structured materials for supercapacitors
Journal name Journal of Power Sources   Check publisher's open access policy
ISSN 0378-7753
1873-2755
Publication date 2012-10-15
Sub-type Article (original research)
DOI 10.1016/j.jpowsour.2012.06.047
Volume 216
Start page 508
End page 514
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
A new type of core–shell structured material consisting of multi-walled carbon nanotubes (MWCNTs) and manganese dioxide (MnO2) nanoflake is synthesized using an in-situ co-precipitation method. By scanning electron microscopy and transition electron microscope, it is confirmed that the core–shell nanostructure is formed by the uniform incorporation of birnessite-type MnO2 nanoflake growth round the surface of the activated-MWCNTs. That core–shell structured material electrode presents excellent electrochemical capacitance properties with the specific capacitance reaching 380 F g−1 at the current density of 5 A g−1 in 0.5 M Na2SO4 electrolyte. In addition, the electrode also exhibits good performance (the power density: 11.28 kW kg−1 at 5 A g−1) and long-term cycling stability (retaining 82.7% of its initial capacitance after 3500 cycles at 5 A g−1). It mainly attributes to MWCNTs not only providing considerable specific surface area for high mass loading of MnO2 nanoflakes to ensure effective utilization of MnO2 nanoflake, but also offering an electron pathway to improve electrical conductivity of the electrode materials. It is clearly indicated that such core–shell structured materials including MWCNTs and MnO2 nanoflake may find important applications for supercapacitors.
Keyword Supercapacitor
Manganese dioxide nanoflake
Carbon nanotube
Core-shell structure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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