Growth of polyaniline on hollow carbon spheres for enhancing electrocapacitance

Lei, Zhibin, Chen, Zhongwei and Zhao, X. S. (2010) Growth of polyaniline on hollow carbon spheres for enhancing electrocapacitance. Journal of Physical Chemistry C, 114 46: 19867-19874. doi:10.1021/jp1084026


Author Lei, Zhibin
Chen, Zhongwei
Zhao, X. S.
Title Growth of polyaniline on hollow carbon spheres for enhancing electrocapacitance
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2010-11
Sub-type Article (original research)
DOI 10.1021/jp1084026
Volume 114
Issue 46
Start page 19867
End page 19874
Total pages 8
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Formatted abstract
Hollow carbon spheres (HCS) with specific surface areas as high as 2239 m2/g were prepared by chemical vapor deposition with ferrocene as the carbon precursor and colloidal silica spheres as the template. Chemical oxidative polymerization of aniline in the presence of the HCS yielded composite materials with a layer of polyaniline (PANI) deposited on the external surface of the HCS. The electrocapacitive properties of the composite materials (HCS-PANI) with different PANI contents were evaluated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. Results showed that the specific capacitances of the HCS before and after PANI coating were, respectively, 268 and 525 F/g in an aqueous H 2SO4 electrolyte, which is almost doubly enhanced. A maximum energy density of 17.2 Wh/kg was achieved for the HCS-PANI electrode at a discharge current density of 0.1 A/g. However, the energy density of the HCS-PANI electrodes with higher PANI contents (>65 wt %) declined quickly as the power density increased. An asymmetric supercapacitor using the composite material as the positive electrode and HCS as the negative electrode showed good electrochemical stability, with 73% of the capacitance, 75% of the energy density, and almost 100% of the power density being retained after 1000 cycles at a current density of 1.0 A/g. © 2010 American Chemical Society.
Keyword Electrochemical Energy-Storage
Mesoporous Carbon
Supercapacitor Electrodes
High Capacitance
Macroporous Carbon
Enriched Carbons
High-Performance
Nanowire Arrays
Surface
Composites
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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