NDLI: Porous polypyrrole clusters prepared by electropolymerization for a high performance supercapacitor

Content Provider	Royal Society of Chemistry (RSC)
Author	Lee, Sang Ho Kim, Won Bae Kim, Jong Guk Dubal, Deepak P. Lokhande, Chandrakant D.
Copyright Year	2012
Abstract	Different nanostructures (Ns), such as nanobelts, nanobricks and nanosheets, of polypyrrole (PPy) were successfully fabricated on stainless steel substrates by simply varying the scan rate of deposition in the potentiodynamic mode. These PPy Ns were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and surface area measurement. The XRD analysis showed the formation of amorphous PPy thin films, and the FTIR studies confirmed characteristic chemical bonding in the PPy materials. SEM images depicted that a high scan rate of deposition can form multilayer nanosheets with high porosity leading to a system with excellent processability. The PPy nanosheets possess a higher Brunauer–Emmett–Teller (BET) surface area of 37.1 m2 g−1 than PPy nanobelts and nanobricks. The supercapacitive performances of different PPy Ns were evaluated using cyclic voltammetry (CV) and galvanostatic charge–discharge techniques in 0.5 M H2SO4. A maximum specific capacitance of 586 F g−1 was obtained for multilayer nanosheets at a scan rate of 2 mV s−1. In addition, impedance measurements of the different Ns of PPy electrodes were performed suggesting that the PPy electrodes with multilayer nanosheets are promising materials for the next generation high performance electrochemical supercapacitors.
Starting Page	3044
Ending Page	3052
Page Count	9
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	7
Journal	Journal of Materials Chemistry
DOI	10.1039/c2jm14470k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fourier Emmett Polypyrrole Stainless steel Voltammetry X-ray crystallography Fourier transform Infrared spectroscopy Spectroscopy Scanning electron microscope Transmission electron microscopy Porosity Cyclic voltammetry Capacitance Electrical impedance Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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