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The morphology, pore structure and chemical composition of materials are key to supercapacitor performances. To design reasonable morphology and optimize pore size distribution of materials, we employ a combination of sol-gel method and chemical activation with an aid of freeze drying to prepare a three dimensional hierarchical porous pitch-based aerogel (3DHPPA). The aerogel owns hierarchical porous...
Single pot, multi-component assembly of resol (carbon source), Pluronic F127, tetraethylorthosilicate (TEOS), dicyandiamide (nitrogen source) and iron nitrate (iron oxide source) yields nitrogen-doped ordered mesoporous carbon/iron oxide nanocomposites on carbonization. Etching the silica derived from the TEOS generates micropores in the carbon framework. The incorporation of iron oxide and nitrogen...
Among all of the requirements for carbon materials used in electric double-layer capacitors (EDLCs), specific surface area (SSA) and electrical conductivity is a pair of mutual competing demands. In this paper, a series of frame-filling structural nanoporous carbons were prepared using an amphiphilic mixture of graphite oxide and a coal tar pitch-based carbonaceous material as precursor ensuring a...
Green needle coke was oxidized by a mixture of HNO3 and H2SO4 (3:7vol/vol) acids. The resultant oxidized coke was separated into water dispersible and non-dispersible fractions, which were then activated by KOH using the same KOH/coke weight ratio to obtain two kinds of nanoporous carbons with different pore structures. The oxidized coke and the nanoporous carbons were characterized by XPS, XRD, TEM,...
Functionalization of carbon nanomaterials (including fullerenes, single-walled carbon nanotubes, multi-walled carbon nanotubes (MWCNTs), and graphene sheets) dispersed in water with macromolecules was achieved by a one-step strategy using β-cyclodextrin polymer (CDP). CDP-carbon nanomaterials were characterized by ultraviolet–visible, Raman, and Fourier transform infrared spectroscopies, transmission...
A homogeneous dispersion of multi-walled carbon nanotubes (MWCNTs) in syndiotactic polystyrene (sPS) is obtained by a simple solution dispersion procedure. MWCNTs were dispersed in N-methyl-2-pyrrolidinone (NMP), and sPS/MWCNT composites are prepared by mixing sPS/NMP solution with MWCNT/NMP dispersion. The composite structure is characterized by scanning electron microscopy and transmission electron...
Carbon spheres (CSs) retaining the morphology of potato starch were prepared by a two-step process: impregnation followed by carbonization. In this process, potato starch was impregnated in NH 4 Cl solution for 1h. The mechanism of preparation was proposed. The presence of HCl catalyzes the dehydration of impregnated starch at lower temperature than its melting point, which destroys the crystallites...
A conductive composite film containing functionalized multi-walled carbon nanotubes (fMWCNTs), gold nanoparticles (Au) with hydroxypropyl-β-cyclodextrin (HPβCD) as catalysts have been synthesized on glassy carbon, gold and on indium tin oxide electrodes by potentiostatic methods. The presence of fMWCNTs and HPβCD in the composite film enhances the active surface coverage concentration of Au by 397...
The methane conversion and carbon yield of the chemical vapor deposition (CVD) reaction suggests that the optimum reaction conditions of the formation of multi-wall carbon nanotubes (MWCNTs) can be obtained by using a 50mg of nano-MgNi alloy under pyrolysis of the pure CH 4 gas with the flow rate about 100–120cm 3 /min at 650°C for 30min. Raman results indicate the CNTs are in multi-wall...
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