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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)...
The structural phase transformation and etching of the sidewalls of multi-walled carbon nanotubes (MWCNTs) by hydrogen plasma and the effect on the dispersion and mechanical properties of polyetherimide (PEI) composites was investigated. Surface-modified MWCNTs with various plasma treatment times were characterized using FESEM, HRTEM, Raman spectroscopy, FT-IR, and XPS. The results showed that plasma...
A small amount of graphene oxide (GO) was introduced into poly(vinylidene fluoride) (PVDF)/carbon nanotube (CNT) composites through solution compounding. The thermal conductivity, crystallization behavior of PVDF matrix, and the dispersion states of CNTs and/or CNT/GO in the PVDF composites were comparatively investigated. The results demonstrated that with the presence of only 1wt% GO, the PVDF/CNT/GO...
Thermally reduced graphene oxide (RGO)/MnO2 composites were prepared by the thermal reduction of graphene oxide (GO)/MnO2 composites. The structure, electrical conductivity and specific capacitance of the composites before and after thermal reduction were investigated by SEM, XRD, FT-IR,the four-point probe method and cyclic voltammetry. Results showed that the GO and RGO significantly decreased the...
SiC-encapsulated graphite was prepared by carbonization of a mixture of expanded graphite and silica sol at 1300°C for 6h, heat treatment in air at 700°C for 4h to remove unreacted surface carbon and HCl-HF etching to remove silica. XRD, TGA, TEM and SEM were used to characterize the samples. Results indicated that the fluorescence emission of the SiC-encapsulated graphite shifts from blue to yellow-green...
Pt–Sn/graphene catalysts were prepared by heat treatment of a dispersion of graphene oxide, SnCl2 and H2PtCl6 in ethylene glycol at 130°C for 3h after its pH value had been adjusted to 12 by NaOH, followed by centrifuging, washing with ethanol and water, and cryodrying. The pH value of the heat-treated dispersion was controlled by adding dilute nitric acid to 2, 4 and 6 to mediate the properties of...
A cylindrical phase change energy storage system was modeled numerically using the finite element method. The model system was composed of a cylindrical container into the center of which is inserted concentrically a copper pipe carrying hot water. Either copper fins or compressed expanded natural graphite (CENG) were placed as heat-conducting fillers between the container and the pipe for comparison...
The propagation of dynamic ripples induced by a C60 molecule is observed in pristine and defective graphene by molecular dynamics simulations. The ripples centered in the impact point propagate outward through the graphene, accompanied by a strain energy transfer. The noticeable diffraction and interference of the dynamic ripples are also observed. The Stone–Wales (SW) defect or vacancies greatly...
Helical nanofibers were synthesized at 271°C using acetylene gas as the reactant and copper nanocrystals, produced by decomposition of copper tartrate, as the catalyst. Their chemical structure was confirmed to be organic compounds containing CC groups using characterization by FT-IR, 1 H NMR and elemental analyses. The morphologies of the catalyst before, during and after the fiber growth...
Macroscopic multi-branched tree-like carbon has been prepared by the chemical vapor deposition of camphor in argon using ferrocene as catalyst. The results show that the building blocks forming the carbon trees are carbon microspheres. Both the diameter of the tree branches and the size of the carbon microspheres become smaller with increasing ferrocene content. The ratio of tree branch diameter to...
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