No abstract

We develop the universal technique of producing the mesoporous carbon nanomaterials. We manage to synthesize, in one and the same reactor, in the different regimes, carbon nanotubes and graphene. The technique consists in conversion of the carbon containing substances in the helium plasma flow generated by the plasma torch at low pressure. We investigate the samples using the scanning electron microscope and the synchronous thermal analysis. The studies, by the limited evaporation method, of the porous structure show that the graphene flakes and the balled nanotubes are mesoporous and thus provide the specific capacity value rather high for the electrochemical electrodes of the supercapacitor (125–133 F/g) at the charging/discharging resistance of 121/100 Ω.

Highly developed nanoporous carbon materials have been prepared by a two-stage thermocatalytic process. In the first step, alder (Alnus rhombifolia) and birchwood (Betula pendula) were carbonized with and without a dehydration catalyst (H3PO4); in the second step, the material was activated by means of NaOH. The dependence of the porous structure of activated carbons from process parameters was characterized by the novel limited evaporation technique. Specific surface areas, pore volumes, and radii were calculated according to the Derjaguin-Broekhoff-de Boer theory. The tests of activated carbons as electrodes in supercapacitors demonstrated their high potential for this application.

No abstract

No abstract