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Electrochemical capacitance performance of polypyrrole-titania nanotube hybrid.
- Source :
-
Journal of Solid State Electrochemistry . Aug2012, Vol. 16 Issue 8, p2683-2689. 7p. - Publication Year :
- 2012
-
Abstract
- In this study, the polypyrrole-titania nanotube hybrid has been synthesized for an electrochemical supercapacitor application. The highly ordered and independent titania nanotube array is fabricated by an electro-oxidation of titanium sheet through an electrochemical anodization process in an aqueous solution containing ammonium fluoride, phosphoric acid and ethylene glycol. The polypyrrole-titania nanotube hybrid is then prepared by electrodepositing the conducting polypyrrole into well-aligned titania nanotubes through a normal pulse voltammetry deposition process in an organic acetonitrile solution containing pyrrole monomer and lithium perchlorate. The morphology and microstructure of polypyrrole-titania nanotube hybrid are characterized by scanning electron microscopy, infrared spectroscopy and Raman spectroscopy. The electrochemical capacitance performance is determined by cyclic voltammetry and charge/discharge measurement. It indicates that the polypyrrole film can been uniformly deposited on both surfaces of titania nanotube walls, demonstrating a heterogeneous coaxial nanotube structure. The specific capacitance of polypyrrole-titania nanotube hybrid is determined to be 179 F g based on the polypyrrole mass. The specific energy and specific power are 7.8 Wh kg and 2.8 kW kg at a constant charge/discharge current of 1.85 mA cm, respectively. The retained specific capacitance still keeps 85% of the initial capacity even after 200 cycle numbers. This result demonstrates the satisfying stability and durability of PPy-TiO nanotube hybrid electrode in a cyclic charge/discharge process. Such a composite electrode material with highly ordered and coaxial nanotube hybrid structure can contribute high energy storage for supercapacitor applications. [ABSTRACT FROM AUTHOR]
- Subjects :
- *POLYPYRROLE
*NANOTUBES
*SUPERCAPACITORS
*TITANIUM dioxide
*ANODES
Subjects
Details
- Language :
- English
- ISSN :
- 14328488
- Volume :
- 16
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 77834127
- Full Text :
- https://doi.org/10.1007/s10008-012-1696-5