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Fe-N-doped porous carbon derived from petroleum asphalt (NPCA) was prepared via a facile template synthesis method, with urea as nitrogen source while α-Fe2O3 nanoparticles as template and Fe source. The as-prepared NPCA calcined at 900 °C (NPCA-900) exhibits excellent electrocatalytic performance with high diffusion-limiting current density and stability comparable to those of commercial Pt/C catalysts...
Graphene quantum dots (GQDs) with unique and tunable physical properties have been the focus of considerable attention because of their potential for electronic and photonic applications. In this work, the electronic polarizability and second hyperpolarizability of hexagonal GQDs were investigated using density functional theory. The effects of size, substituent, and incident frequency of hexagonal...
Large-sized graphene sheets (LG) and doping strategy were employed to fabricate lightweight and flexible graphene paper with exceptional electromagnetic interference (EMI) shielding performance. Compared with the smaller sized ones, LG with fewer defects and more conjugated carbon domain size as well as better alignment result in higher electrical conductivity and strength of graphene paper. The iodine...
Ultralight cellulose fiber/thermally reduced graphene oxide (CF/RGO) hybrid aerogel with super-elasticity and excellent electromagnetic interference (EMI) shielding capability was fabricated through lyophilization and carbonization process. CF/RGO aerogel with 5 mm thickness exhibits high EMI shielding effectiveness (SE) of ∼47.8 dB after annealing at 1000 °C with 5% hydrogen-argon mixture atmosphere...
Fluidized bed filtration is a promising technique to remove particles from gas stream. In this work, a fluidized bed filter with agglomerated carbon nanotubes (CNTs) as bed materials is employed to filtrate aerosol particles and its filtration performance is investigated. The aerosol filtration efficiency of fluidized bed filters is found to highly depend on the fluidization state of the filter media...
Reduced graphene oxide/Mn3O4 (rGO/Mn3O4) nanocomposites were prepared from MnSO4 and GO produced by a modified Hummers method. The GO was deoxygenated by heat treatment, and MnO2 generated by hydrolysis of MnSO4 was simultaneously reduced to Mn3O4. The Mn3O4 content in the composites could be tailored by the volume of supernatant in the pristine GO/MnSO4 suspension. The maximum specific capacitance...
Carboxylated multi-wall carbon nanotube (c-MWCNT)–Fe 3 O 4 magnetic hybrids (c-MWCNTMHs) were prepared by mixing FeCl 3 ·6H 2 O, sodium acetate, ethylene glycol and diethylene glycol with c-MWCNTs, followed by sonicating and heat treatment at 200°C for 10h. Results indicated that the c-MWCNTMHs showed a good dispersion stability, an acid and alkali resistivity, and...
High-density parallel arrays of ultralong carbon nanotubes (CNTs) were prepared by utilizing catalyst nanoparticles anchored by silica nanospheres through chemical vapor deposition (CVD). Silica nanospheres and catalyst solution were sequentially spin-coated onto the substrates for the growth of ultralong CNTs, followed by annealing to remove the polymer residues. Catalyst nanoparticles can be anchored...
The reason why few carbon nanotubes (CNTs) nucleated in the catalyst region on substrates grow into ultralong ones during gas flow directed chemical vapor deposition (CVD) of horizontally aligned CNT arrays was explored. Small catalyst nanoparticles tend to merge into large ones due to the high processing temperature, which accordingly produces multi-wall CNTs (MWCNTs). These MWCNTs usually follow...
The effect of growth conditions and catalyst lifetime on the supergrowth of carbon nanotubes (CNTs) through a water assisted chemical vapor deposition has been investigated. The reasons behind the observed sudden termination of the CNT growth were explored. A proper amount of water was found to improve the activity of the catalyst and enhance the growth rate of CNTs. However, the introduction of water...
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