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Silicon (Si) is considered to be one of the alternative anode candidates for lithium-ion batteries due to the high theoretical capacity. Enhancing the columbic efficiency, cycle stability, alleviating the pulverization and decreasing the manufacturing cost are the major challenges that procrastinate the commercialization of Si anode. Inspirited by spiderweb structure, the Si nanoparticles (SiNPs)...
Graphene-based hierarchically porous materials have exhibited enormous potentials in high-performance lithium-ion batteries. However, the electrochemical performance of these materials is hampered due to the detachment of active materials from graphene upon long-term cycling. Therefore, the interfacial design between active materials and graphene is crucial for their high performance in lithium-ion...
The porous ultrathin graphitic carbon nitride (g-C3N4) with confined surface carbon defects was obtained via the twice thermal treatment of bulk g-C3N4. The as-prepared porous ultrathin g-C3N4 sample displayed the average thickness of about 0.9 nm. The porous ultrathin g-C3N4 with confined surface carbon defects was designed to bidirectional acceleration of carrier separation for both the bulk and...
A carbon/carbon (C/C) composite with a thermal conductivity greater than 500W/mK was used as a heat-redistribution material in a new thermal protection system. Using this material, the temperature at the hot head of a model hypersonic aircraft re-entry cone was sharply decreased, which effectively reduced the thermal burden and protected the hot side from being destroyed.
Fluffy carbon nanotubes (CNTs), which are cotton-like macroscopic structures, are obtained by simple high-speed shearing of vertically aligned CNT (VACNT) arrays. The fluffy CNTs are composed of CNT bundles with a diameter of several micrometers, and have an extremely low apparent density of 3–10g/L. A requisite for their formation is the alignment of CNTs in the initial array. The shear between the...
Platelet graphite nanofibers have been characterized by scanning electron microscopy, transmission electron microscopy, electron diffraction, X-ray photoemission spectroscopy, and atomic force microscopy. The results show that the graphene sheets are stacked parallel to each other and are perpendicular to the fiber axis; the interlayer spacing is 0.34nm. A small fraction of carbon atoms are bonded...
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