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Electrochemical behavior of metallic and semiconducting single-wall carbon nanotubes (SWCNTs) separated by agarose gel chromatography was analyzed as electrodes of electric double-layer capacitor (EDLC). Due to the doping of ions to semiconducting SWCNTs, the cyclic voltammogram of semiconducting SWCNTs showed amphoteric behavior, which is analogous to that of dopable conducting polymers. As the potential...
Pure single-walled carbon nanotubes (SWCNTs) with little bundling show an excellent capacitor performance attributable to the intrinsic nature of the SWCNTs, and possess unusual electrochemical properties characterized by a butterfly shaped cyclic voltammogram which differs from those for conventional activated carbon electrodes. Electrochemical doping in semi-conductor nanotubes occurred at the interface...
WC/carbon composites (WCCs) with high specific surface area were synthesized by the direct carbonization of a mixture of hydroxylpropyl cellulose, polyvinyl alcohol, K 2 WO 4 and K 2 CO 3 at 900°C in flowing N 2 . The resultant material was characterized using X-ray diffraction, thermogravimetric analysis, nitrogen sorption and scanning electron microscopy....
The structure of carbon nanospheres of 100–200nm diameter, which showed superior high-speed charge–discharge behavior as the negative electrode in a lithium ion battery, was investigated with XRD, SEM and TEM with an electron tomography attachment. Observation of carbon 002 lattice images, as well as electron diffraction patterns, illustrated that heterogeneous microtexture was formed as the polyhedronization...
Multi-walled carbon nanotubes (CNTs) were doped with B at the initial loading of 1 and 2.5 wt.% and their oxidation behaviors in both air and oxygen plasma were studied to assess the effects of substitutional B in carbon oxidation and examine the hypothesis that the preferential attack by atomic oxygen on basal plane is due to delocalized π-electrons. The effect of substitutional B on oxidation of...
Hydrogen separation properties in pore channels with the diameter comparable to CO 2 or less were investigated by using molecular sieving carbon membranes from polyimide. The accurate control of the pore channels in sub-nanometer scale gave membranes with quite high H 2 /CO selectivity on permeation, which can be used for hydrogen purification system. Adsorption and diffusion properties...
Porous carbon having more than 2000 m 2 /g of BET specific surface area was synthesized by defluorination of polytetrafluoroethylene (PTFE) at 473 K using sodium metal. The porous carbon as-prepared had a large amount of narrow mesopores 2-3 nm in pore width, together with micropores. Control of the pore structure was attempted by simple heat-treatment of the carbon in nitrogen, and change...
The structural change of carbon aerogels at high temperatures up to 2800 o C has been investigated. Change in microtexture of fine particles, which constitute carbon aerogels derived from phenolic resin, was of a typical non-graphitized carbon. The microporosity decreased with an increase of heat-treatment temperature, and disappeared at 2000 o C. The mesoporosity still remained even...
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