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Here, we present a facile technique to design self-supported 3D N-doped graphene foam (NGF) via simply annealing in chemical vapor deposition furnace which used powder metallurgy nickel template and melamine as both carbon and nitrogen source. The NGF possesses highly conductive and interconnected mesoporous network. Particularly nitrogen-doping provided strong polysulfide immobilization ability,...
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...
Temperature-independent property and high piezoresistivity are critical for carbon nanotube polymer nanocomposites with sensing capability. In this work, a temperature-independent CNT/Epoxy resin nanocomposite was fabricated successfully. This composite has good and stable piezoresistivity between 233 K and 373 K. By developing a multi-scale percolation network model, this work also reveals theoretically...
Non-noble, high-efficient electrodes with excellent durability are desirable for water splitting. Herein, a facile strategy has been proposed to in-situ grow nitrogen-doped carbon dots (NCDs) decorated Ni3S2 on Ni foam (NCDs/Ni3S2/NF) by hydrothermal treatment of Ni foam in water solution of thiourea and NCDs. Interestingly, coral-like NCDs/Ni3S2/NF composites are unprecedentedly prepared without...
Many experiments have shown that electrical conductivity and dielectric permittivity of graphene-polymer nanocomposites are strongly dependent on the loading frequency, but at present no theory seems to be able to address the continuous influence of frequency. In this work we present a new effective-medium theory that is derived from the underlying physical processes including the effects of filler...
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...
Photooxidation plays an important role in organic synthesis. However, deep oxidation and degradation could reduce the product selectivity and the final yield, which is a crucial issue in the photooxidation reactions. Polymeric carbon nitride (C3N4) shows great potentials in the photocatalysis, but most improved methods make C3N4 show strong oxidation ability, which limits their applications in the...
The anode performance of mesocarbon microbeads (MCMBs) is tested as they are used in sodium-ion batteries. The MCMBs carbonized at 700 °C consist of graphite-like crystallites with an interlayer distance of 357 pm, and with a crystal stack height of 1.61 nm. They deliver an initial charge capacity of 232 mAh g−1 at a current density of 25 mA g−1, and keep a reversible capacity of 161 mAh g−1 after...
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,...
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...
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