Abstract

Carbon nanofibers (CNFs) show a high electrical conductivity but a reduced specific surface area that limits
\ntheir use as electrode materials for supercapacitors. In this work, amorphous CNFs, with a relatively high
\nelectrical conductivity are easily activated in KOH, using certain KOH/CNF weight ratios. Activation does
\nnot produce any important change in the shape, surface roughness, diameter, graphene sheet size, and electrical
\nconductivity of starting nanofibers. However, activation leads to new micropores and larger surface areas as
\nwell as a higher content of basic oxygen groups. They clearly enhanced the specific capacitance, attaining
\nvalues higher than those reported for other activated CNFs. In this study, the effects of micropore size and
\noxygen content on the specific capacitance are discussed for three electrolytes: H2SO4, KOH, and
\n(CH3CH2)4NBF4. Moreover, a good cycle life is found for the most activated CNFs.

Keywords

SupercapacitorMaterials scienceCarbon nanofiberSpecific surface areaCapacitanceNanofiberMicroporous materialElectrolyteActivated carbonChemical engineeringElectrodeConductivityAmorphous solidElectrical resistivity and conductivityAmorphous carbonCarbon fibersNanotechnologyComposite materialCarbon nanotubeChemistryComposite numberAdsorptionCatalysisOrganic chemistry

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Publication Info

Year
2010
Type
article
Volume
114
Issue
22
Pages
10302-10307
Citations
264
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Cite This

Violeta Barranco, M.A. Lillo-Ródenas, Á. Linares-Solano et al. (2010). Amorphous Carbon Nanofibers and Their Activated Carbon Nanofibers as Supercapacitor Electrodes. The Journal of Physical Chemistry C , 114 (22) , 10302-10307. https://doi.org/10.1021/jp1021278

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DOI
10.1021/jp1021278