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Hollow particles of N,B co-doped carbon were synthesized at different temperatures and used as electrocatalysts for the oxygen reduction reaction (ORR). The particles were synthesized by chlorinating Ti(C0.3N0.7) and TiB2 powders, with the sample formed at 800 °C showing the highest ORR activity, which was comparable to a commercial Pt/C catalyst. The catalyst electron transfer number of 3.94 was...
Carbon nanotube/polyurethane (CNT/PU) composites were prepared by using an in-situ polymerization method, and their electrical sensitivity to tensile strain was investigated. The addition of CNTs can remarkably enhance both the mechanical strength and electrical conductivity of the composite. The CNT/PU composite exhibits a high sensitivity of electrical resistance to changes in tensile strain. The...
The topological microstructure of micro-coiled carbon fibers (MCFs) before and after high temperature treatment (HTT) was explored and characterized. Results suggested that as-grown MCFs had an annular ring-like structure in the cross section and a herringbone-like structure in the longitudinal section, but the orientation range of graphitic domains was wide. After HTT, the coiled fibers consisted...
Graphene oxide hydrogels have been prepared by ultrasonication of precursor aqueous dispersions. The ultrasonication fractures the nanosheets, reducing their dimensions and exposing new sheet edges that do not possess the stabilizing carboxyl functional groups found along the edge of the as-prepared material. Ultrasonication does not affect the overall chemical functionality of the graphene oxide...
The structural evolution of a carbon microcoil (CMC) induced by a direct current was studied using a scanning tunneling microscope–transmission electron microscope work station. We found that the CMC got broken when a high-density current was passed through, and it was partially transformed into hollow graphitic spheres, double-walled carbon nanotubes, and fullerenes. A transformation process involving...
Carbon microcoils (CMCs) were prepared by catalytic pyrolysis of acetylene containing a small amount of thiophene as a promoter at 973–1073K using nickel foam catalyst which was also used as a substrate, with the CMC yield of about 62% relative to the introduced carbon source. The morphology of the product was observed by scanning electron microscopy (SEM). The morphology of the nickel foam was changed...
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