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Nitrogen-doped porous carbon with well-balanced charge conduction and electrocatalytic activity were synthesized from nitrogen-rich pitch by hard-template method. The sample carbonized at 900 °C possessing high nitrogen content (7.11 wt.%) and large specific surface area exhibits high electrocatalytic activity in dye-sensitized solar cells. A fast charge conduction involving facile ion transport and...
Macroscopic lossy foam has been expected to be the most promising candidate for lightweight high-performance microwave absorption (MA). However, inferior MA behaviors of conventional foams reported previously are disappointing. The emerging graphene foam (GF) has broken this paradoxical state of affairs. Here, series of GFs with various chemical compositions and physical structures have been prepared...
A three-dimensional (3D) structure carbon foam for microwave absorption is synthesized by a facile template method using coal liquefaction residue (CLR) as carbon source. The results have shown that the sample made under optimized conditions has exhibited a broad effective absorption bandwidth up to 5.8 GHz in a range of 2–18 GHz with a reflection loss ≤ −10 dB. The magnetic Fe species derived from...
Achieving efficient and stable nanotube–nanotube interconnects is of great significance for translating the excellent electrical properties of individual carbon nanotubes (CNTs) to two-dimensional networks. In the present work, a modification technology to build interconnecting nodes in CNT networks with copper-halide crystallites is demonstrated. A pulse photonic curing system is utilized to realize...
Activated carbons (ACs) were prepared by CO 2 activation using depleted fullerene soot as precursor. The structure of the ACs was investigated by TEM, XRD, and nitrogen adsorption. Their electrochemical properties in electrochemical capacitors were tested by cyclic voltammetry (CV) and galvanostatic charge/discharge methods in a three-electrode cell. Activation temperature and time were proved...
A new kind of C/C composite was made to meet the requirements of the severe conditions suffered by a high performance throat-insert of a solid rocket motor using a method that includes four steps: preform preparation, pressure impregnation and carbonization, high pressure impregnation and carbonization, and high temperature treatment. The preform was made of soft carbon fiber yarns and rigid carbon...
Two-dimensional carbon belts (CBs) made of carbon nanofibers (CNFs) supported on a carbon foam (CFoam) substrate have been synthesized by a procedure involving carbonization of polyamic acid (PAA)/Ni(NO 3 ) 2 solution impregnated polyurethane foam in flowing H 2 at 700°C and catalytic chemical vapor deposition (CCVD) using C 2 H 4 as a carbon source and SO ...
P/N co-doped porous carbons have been synthesized by a simple method through direct carbonization of phosphoric acid doped polyaniline. The textural property and the surface chemistry have been investigated by nitrogen sorption and X-ray photoelectron spectra. P/N co-doped carbons exhibit typical microporous characters with a low surface area and a narrow pore size distribution. Interestingly, the...
Carbon foams (CFoams) were made by combining a hard template with a catalytic graphitization method, in which polyurethane foam is used as a sacrificial template, polyamic acid is used as carbon source and Ni is used as catalyst. The cell walls of CFoams are made of in situ self-assembled carbon nanocapsules (CNCs) with diameters of 30–80nm. The open cells of the CFoams are, on average, 500μm in diameter,...
A carbon nanofiber (CNF)/carbon foam composite was fabricated from coal liquefaction residue (CLR) through a procedure involving template synthesis of carbon foam and catalytic chemical vapor deposition (CCVD) treatment. The high solubility and high pyrolysis yield make CLR a promising carbon precursor for the synthesis of carbon materials using the template method. The carbon foam has cell size of...
Armchair metallic single-walled carbon nanotubes (SWCNTs) retain their high symmetry under tensile stretching, and their electrical properties are the least sensitive to tensile strain. Other types of SWCNTs with lower symmetries, including quasi-metallic (or small band-gap semiconducting) and semiconducting SWCNTs, are more sensitive and can exhibit band-gap changes under tensile stretching. In this...
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