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Electrodeposition and pseudocapacitive properties of tungsten oxide/polyaniline composite
Zou, Ben-Xue; Liang, Ying; Liu, Xiao-Xia; Diamond, Dermot; Lau, King-Tong
Composite films of tungsten oxide (WO3) and polyaniline (PANI) have been electrodeposited by cyclic voltammetry in a mixed solution of aniline and precursor of tungsten oxide. Surface morphology and chemical composition of WO3/PANI composite are characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The influence of H2O2 on the electrodeposition of WO3/PANI composite film is also investigated. Cyclic voltammetry (CV), chronopotentiometry (CP) and electrochemical impedance spectroscopy (EIS) results show that WO3 /PANI composite film exhibit good pseudocapacitive performance over a wide potential range of −0.5 to 0.7V vs. SCE with the specific capacitance of 168 F g−1 at current density of 1.28 mA cm−2 and energy density of 33.6 Wh kg−1 , which is 91% higher than that of similarly prepared PANI (17.6 Wh kg−1 ). An asymmetric model capacitor using WO3/PANI as negative and PANI as positive electrodes over voltage range of 1.2V displays a specific capacitance of 48.6 F g−1 and energy density of 9.72 Wh kg−1 at the power density of 53 W kg−1 , which is two times higher than that of a symmetric capacitor modeled by using two PANI films as both positive and negative electrodes.
Keyword(s): Materials; Chemistry; Tungsten oxide; Polyaniline; Negative electrode material
Publication Date:
Type: Other
Peer-Reviewed: Unknown
Language(s): English
Institution: Dublin City University
Citation(s): Zou, Ben-Xue, Liang, Ying, Liu, Xiao-Xia, Diamond, Dermot ORCID: 0000-0003-2944-4839 <> and Lau, King-Tong ORCID: 0000-0001-7818-7010 <> (2011) Electrodeposition and pseudocapacitive properties of tungsten oxide/polyaniline composite. Journal of Power Sources, 196 (10). pp. 4842-4848. ISSN 0378-7753
Publisher(s): Elsevier
File Format(s): application/pdf
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First Indexed: 2013-04-10 05:24:01 Last Updated: 2019-02-09 06:37:20