Please use this identifier to cite or link to this item:
http://hdl.handle.net/10261/21409
Share/Export:
![]() ![]() |
|
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Title: | Single-walled carbon nanotubes as electrodes in supercapacitors |
Authors: | Picó, Fernando; Rojo, J. M. CSIC ORCID; Sanjuán, M. L. CSIC ORCID; Ansón Casaos, Alejandro CSIC ORCID ; Benito, Ana M. CSIC ORCID ; Callejas, María A.; Maser, Wolfgang K. CSIC ORCID ; Martínez Fernández de Landa, María Teresa | Keywords: | Carbon nanotubes Supercapacitors Nanotube devices Electrochemical electrodes Adsorption Oxidation Heat treatment Electrolytes Raman spectra |
Issue Date: | 30-Apr-2004 | Publisher: | Electrochemical Society | Citation: | Journal of the electrochemical society 151(6): A831-A837 (2004) | Abstract: | As-grown and modified single-walled carbon nanotubes (SWCNTs) have been used as electrochemical active materials of electrode for electrochemical capacitors (supercapacitors). A series of modified SWCNTs has been obtained by oxidation of the as-grown SWCNTs in air at increasing temperatures in the range 300-550°C. The as-grown and modified samples have been characterized by Raman spectroscopy, N2 adsorption, and transmission electron microscopy (TEM). Raman spectra of the modified samples show that heating at increasing temperature produces a decrease in the intensity of radial and tangential breathing modes of SWCNTs and an alteration of the structure of SWCNTs up to complete destruction at 550°C. Heat-treatment at 350°C leads to the highest specific surface area (644 m2 g–1) and the highest micropore volume (0.288 cm3 g–1). TEM images of the as-grown and 350°C-oxidized samples show a multicomponent structure with bundles of SWCNTs that are thinner in the oxidized sample compared to the as-grown one. The as-grown and 350°C-oxidized SWCNTs were mixed with polyvinylidenefluoride and compacted to get electrodes. 6 M KOH and 2 M H2SO4 aqueous solutions were utilized as electrolytes. The specific capacitances (30-140 F g–1) are discussed on the basis of the electrode material and the electrolyte chosen. The specific capacitance is higher for the 350°C-oxidized SWCNTs and when KOH is used as electrolyte. Typical values of the equivalent series resistance (ESR) are in the range 1-5 , except for the oxidized sample when KOH is used as electrolyte; in this case, ESR is higher. The thermal treatment improves the energy density but does not affect the power density, this last being higher when H2SO4 is used. | Description: | 7 pages.-- PACS: 82.47.Uv; 82.45.Fk; 85.35.Kt; 68.43.Mn; 82.45.Yz; 82.45.Gj; 81.40.Gh; 78.30.Na | Publisher version (URL): | http://dx.doi.org/10.1149/1.1738678 | URI: | http://hdl.handle.net/10261/21409 | DOI: | 10.1149/1.1738678 | ISSN: | 0013-4651 |
Appears in Collections: | (ICMM) Artículos (ICMA) Artículos (ICB) Artículos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
accesoRestringido.pdf | 15,38 kB | Adobe PDF | ![]() View/Open |
Review this work
SCOPUSTM
Citations
115
checked on May 26, 2022
WEB OF SCIENCETM
Citations
108
checked on May 23, 2022
Page view(s)
392
checked on May 27, 2022
Download(s)
117
checked on May 27, 2022
Google ScholarTM
Check
Altmetric
Dimensions
WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.