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Nitrogen-abundant compounds are generally regarded as perfect precursors toward in situ synthesis of nitrogen-doped carbon materials. In this study, we demonstrate a facile one-pot procedure to synthesize polyaniline-coated melamine fiber (PANI@MF) as the precursor, in which melamine fiber (MF) acts as both scaffold and nitrogen source. After high-temperature pyrolysis, wrinkled nitrogen-doped carbon...
Nitrogen doped carbon materials, as the most promising non-metal electrocatalyst for oxygen reduction reaction (ORR), have attracted great attention because of their catalytic activities approaching to that of commercial Pt/C, good ethanol tolerance, low price and chemical stability. Here, we demonstrate the conjugated polymer-mediated synthesis of a series of nitrogen doped carbon nanoribbons (NDCNRs)...
The emerging wire-shaped supercapacitors (WSSs) have motivated tremendous research interests in energy storage devices. However, challenges still exist in the pursuit of high-rate performance WSS. Here, a graphene fiber made from chemical vapor deposition grown laminated graphene sheet is adopted to form a WSS which exhibits an exceptional rate capability with a relaxation time constant of 1.4 ms,...
Rational design on the microstructure of electromagnetic composites offers immense potential for overcoming the challenges related to the microwave absorption performance. In this study, uniform core-shell Co@C microspheres are innovatively fabricated through an in situ transformation from Co3O4@phenolic resin precursor. Carbon shells restrain the agglomeration of Co particles during high-temperature...
Carbon materials, as a typical dielectric loss medium, are always the most attractive candidates for microwave absorption due to their characteristic advantages; however, much less attention has been paid to upgrading their performance by rational design on the microstructure. According to the transmission behavior and loss mechanism of electromagnetic waves, uniform yolk-shell C@C microspheres are...
Graphene films fabricated by chemical vapor deposition are promising electrode materials for stretchable energy storage devices. The buckled four-layer graphene on a polydimethylsiloxane film substrate subject to various applied tensile strains has been characterized by atomic force microscopy and micro-Raman mapping. The small redshift of 2D band and the indiscernible D band demonstrated that the...
The growth of double-layered vertical-aligned carbon nanotube (CNT) arrays by a single step chemical vapor deposition is reported. The deactivation and reactivation of catalyst particles may be the cause of such a growth process. An interesting morphology difference between the top and the bottom CNT layers was observed. In contrast to the smooth surface of the top CNT layer, the surface of the bottom...
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