期刊
SYNTHETIC METALS
卷 193, 期 -, 页码 48-57出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2014.03.029
关键词
Supercapacitor; Nanocomposites; Polyaniline; Multiwalled carbon nanotubes; Sodium alginate
资金
- National Training Fund for Talented Person of Basic Subjects [J1103307]
- Opening Foundation of State Key Laboratory of Applied Organic Chemistry [SKLAOC-2009-35]
Novel nanocomposites with coaxial tubular morphology based on sodium alginate-multiwalled carbon nanotubes/polyaniline (SA-MWCNTs/PANI) have been synthesized via the in situ chemical oxidative polymerization of aniline with SA-modified MWCNTs, and optimized preparation conditions were employed in order to achieve higher specific capacitance. The resulting SA-MWCNTs/PANI nanocomposites were fully characterized by means of FTIR, UV-vis, TEM, SEM, XRD and TGA methods, and the nanocomposites will hold well-defined core/shell structure in terms of their morphology, structure and thermal stability. Meanwhile, the electrochemical and conductivity of the resulting SA-MWCNTs/PANI nanocomposites were investigated by measurement of cyclic voltammetry, galvanostatic charge-discharge and conductivity. The results show that SA-modified MWCNTs as a support material could provide more electroactive sites for nucleation of PANI as well as excellent electron diffusion path, and SA-modified MWCNTs were homogeneously coated on both surfaces with PANI nanoparticles. In addition, the SA-MWCNTs/PANI nanocomposites achieved the maximum specific capacitance as high as 442 F/g at a current density of 0.5 A/g, long cycle life, and fast reflect of oxidation/reduction on high current changes, the highest value reported so far for biopolymer-doped PANI nanocomposites under the lowest doping amount of MWCNTs (0.6 wt%). (C) 2014 Elsevier B.V. All rights reserved.
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