The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The synthesis of highly nitrogen-doped hierarchical carbon spheres (NPCS) is reported. The NPCS with pomegranate-like nanostructure were prepared by the CaCO3 spheres template-induced self-activation route with dopamine as the carbon precursor. The template-induced self-activation mechanism was carefully investigated by controlling experiment conditions and thermogravimetric analyses combined with...
The influences of carbon nanotubes (CNTs) introduced in three different phases of carbon fiber/pyrolytic carbon/silicon carbide (Cf/PyC/SiC) composites on the microstructure and properties of the composites were investigated in this paper. The results showed with CNTs introduced at PyC-PyC interface, tensile strength and work of fracture (WOF) of a Cf/PyC/SiC composite had the largest increase, and...
All carbon-electrode is ideal for supercapacitor, but synthesizing macro-level >3 GPa strong porous carbon electrode is challenging. Here, we presented an approach of synthesizing robust flexible “carbon-concrete” films integrating carbon fibers, graphene and hierarchical porous activated carbon. The method involved electrochemically spreading of carbon fiber bundles and in-situ activation of cellulose...
Porous yet high electronic conductivity carbon electrodes with high ion-adsorptive surface area and low ion/charge transport resistance are crucial to the realization of high-energy/power supercapacitors but have proved to be very challenging to obtain. Herein, nitrogen-doped nano-sheet carbons were synthesized by direct carbonization and activation of polypyrrole at different temperatures. As the...
Graphene is known to suffer from severe aggregation and incomplete recovery of a π–π conjugated system during the reduction process from graphene oxide. Here we report that these issues can be addressed by using a modified molten salt system. The advantages of the molten salt for reducing graphene show in three aspects: (i) prevent restacking; (ii) restore the conjugated network; (iii) serve as reaction...
4D preforms woven with carbon fiber bundles and carbon rods were densified by repeated pitch impregnation, carbonization and high temperature treatment to obtain 4D-C/C composites. The tensile properties were investigated at room temperature when tension was applied in the carbon rod direction (Z direction). The strain and stress under tensile load were measured, and the surface morphologies of specimens...
Low-density polyethylene (LDPE) and carbon nanotube (CNT) composites (CNT/LDPE) were treated during their hot-press molding using a strong static magnetic field. The effect of the magnetic field on the direct current electrical conductivity of these materials was investigated and the mechanism for the effect was analyzed by differential scanning calorimetry, polarized light microscopy and atomic force...
Nitrogen-doped graphene (N-G) was prepared by thermal annealing of graphene oxide in ammonia at different temperatures. The resultant N-G was used as a conductive support for Pt nanoparticles (Pt/N-G) and the electrocatalytic activity of the Pt/N-G catalysts towards methanol oxidation was examined. To investigate the microstructure and morphology of the synthesized catalysts, X-ray diffraction, scanning...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.