Multiwall carbon nanotube-poly(4-styrenesulfonic acid) supported polypyrrole/manganese oxide nano-composites for high performance electrochemical electrodes

作者：Sharma Raj Kishore; Karakoti Ajay; Seal Sudipta; Zhai Lei^*

来源：Journal of Power Sources, 2010, 195(4): 1256-1262.

DOI：10.1016/j.jpowsour.2009.08.093

• Supercapacitor
• Rate capability
• Polypyrrole
• MnO(2) electrochemical electrode

Poly(4-styrenesulfonic acid) (PSS) dispersed multiwall carbon nanotubes (MWCNTs) are used as a support for polypyrrole (PPy)/MnO(2) in a supercapacitor electrode. Synergetic interaction between polypyrrole and MnO(2) significantly improves the electrical properties and the mechanical stability of the electrode that yields high rate capability. The (-SO(3)(-)) Surface functionalities on MWCNT-PSS facilitate an ordered growth, and the molecular level dispersion of MnO(2) in PPy matrix enhances the electrode performance. As an electrochemical electrode the MWCNT-PSS/PPy:MnO(2) nano-composite exhibits similar to 268 F g(-1) specific capacitance at 5 mV s(-1). The excellent rate capability and stability of the electrode is demonstrated by only 7% fade in the specific capacity at 100 mV s(-1) (compared to the available capacity at 5 mV s(-1))and 10% fade in the same after 5000 CV cycles. Specific capacitance of PPy:MnO(2) component in the nano-composite is as high as 412 F g(-1) in 0.5 M Na(2)SO(4) electrolyte. Electrical conductivity of the MWCNT-PSS/PPy nanocomposite is significantly improved upon inclusion of MnO(2) in molecular level dispersion.

• 出版日期2010-2-15