Supercapacitor performance of binder-free buckypapers from multiwall carbon nanotubes synthesized at different temperatures
Multiwall carbon nanotubes (MWCNTs) have been synthesized by aerosol‐assisted catalytic chemical vapor deposition method from a 2% ferrocene solution in toluene at temperatures of 720 and 800 °C. After an oxidation by a HNO3/H2SO4 mixture, MWCNTs were dispersed in water and deposited in form of buck...
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Published in | Physica Status Solidi. B: Basic Solid State Physics Vol. 253; no. 12; pp. 2406 - 2412 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Blackwell Publishing Ltd
01.12.2016
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Subjects | |
Online Access | Get full text |
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Summary: | Multiwall carbon nanotubes (MWCNTs) have been synthesized by aerosol‐assisted catalytic chemical vapor deposition method from a 2% ferrocene solution in toluene at temperatures of 720 and 800 °C. After an oxidation by a HNO3/H2SO4 mixture, MWCNTs were dispersed in water and deposited in form of buckypapers with a thickness of ∼150 μm. The obtained materials were used as working electrodes of supercapacitors without adding of binder. The electrode from MWCNTs synthesized at lower temperature showed the larger capacitance in 1 M H2SO4 and 6 M KOH electrolytes, especially at low scan rates. An increase of double‐layer capacitance was due to larger specific surface and microporosity of the material; a gain in pseudocapacitance was attributed to larger quantity of oxygenated groups developed on the defective surface of nanotubes. The electrode showed a good cyclic performance during a repetitive charge/discharge test.
A larger specific capacitance of MWCNTs synthesized at 720 °C is related with etching of nanotube tips and higher oxygenation of nanotube surface as the result of binder‐free buckypaper electrode preparation. |
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Bibliography: | ArticleID:PSSB201600240 ark:/67375/WNG-B3ZWCZTM-W istex:1B34ADBFD90EE60FD85AAE7B1C302477A58ACFA6 Russian Foundation for Basic Research - No. 14-29-04062 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0370-1972 1521-3951 |
DOI: | 10.1002/pssb.201600240 |