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Both regular and defective onion-like carbon (OLC) nanoparticles were prepared by the arc-discharge process using hexane (C6H14) and ethanol (C2H5OH) as carbon sources. The formation of defective sites in OLC nanoparticles is ascribed to the introduction of oxygen of ethanol. It is shown that high vacuum or using raw materials without oxygen is favorable to form regular onion-like microstructure....
HNO3-oxidized single-wall carbon nanotubes (SWCNTs) and graphene oxide (GO) were ultrasonically dispersed in water to which potassium permanganate was added, and the resulting mixtures were treated under microwave radiation at 100°C for 1h or hydrothermal conditions at 100°C for 1, 5 and 10h to prepare SWCNT–GO/MnO2 composites as electrode materials of electrochemical capacitors. Results indicate...
Graphene oxide (GO) prepared by a modified Hummers method was reduced by NaBH4 at room temperature for 12h in a 0.5mg/mL GO water suspension to obtain reduced GO (RGO), using CaCl2 as a catalyst. The GO and RGO were characterized by XPS, FT-IR, UV–Vis and electrical resistivity measurements. Results show that CaCl2 improves the reduction ability of NaBH4 for oxygen-containing functional groups on...
Activated carbons (ACs) were prepared from peanut shells by KOH activation under microwave heating and were used as electrode materials for electrochemical capacitors (ECs). The pore structure of the ACs was characterized by nitrogen adsorption and the electrochemical performance by galvanostatic charge–discharge and cyclic voltammetry. Results show that the ACs’ specific surface area, total pore...
Porous carbons (PCs) for super capacitors were prepared from coal tar pitch by a one-step microwave-assisted KOH activation with low KOH consumption. The surface area of the PC (PC2−M) made at a KOH/pitch mass ratio of 2 with microwave heating for 30min reaches 1786m2/g. The electrochemical performance of the PC electrode for super capacitors was evaluated in different electrolytes including KOH,...
Nanoporous carbons with a hierarchical pore structure were prepared by a combination of hard-templating of a thermosetting phenolic resin containing silica nanoparticles, pyrolysis and KOH activation. The influence of the amount of KOH on the pore structure of the templated and activated carbons was investigated by N 2 adsorption and the effect of pore structure on the CO 2 adsorption...
A new approach is described for preparing carbon foam (CF) through coaxial electrohydrodynamic atomization (EHDA). Using polyacrylonitrile (PAN) and borneol as a carbonaceous precursor and a blowing agent, respectively, hybrid PAN-borneol films were prepared and transferred to a honeycomb PAN membrane through blowing, drying, and pre-oxidation with the CF prepared by carbonization of the PAN film...
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