Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 2, Pages 674-679Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.07.033
Keywords
Supercapacitor; Carbon nanotube film; Electrical conducting polymer
Funding
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [803149] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [923499] Funding Source: National Science Foundation
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Self-supported supercapacitor electrodes with remarkably high specific capacitance have been developed by homogeneously coating polypyrrole (PPy) on multi-walled carbon nanotube (MWCNT) membranes. Polypyrrole can be deposited around the individual MWCNTs in a uniform manner throughout the MWCNT membrane via a pulsed electrochemical deposition method. This approach optimizes the pseudocapacitance of the membrane. Electrochemical data and Raman spectra indicate that the high specific capacitance is not only due to more uniform PPy coating, but also higher redox activity that is likely associated with a more ordered PPy packing. Such composite membranes can be directly used as supercapacitor electrodes without backing metal films or binders. A remarkable specific capacitance of 427 F g(-1) has been achieved using 5-s electrodeposition pulses. This technique provides a viable solution for developing high-performance electrical energy storage devices. (C) 2009 Elsevier B. V. All rights reserved.
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