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Development of non-noble metal catalysts for oxygen reduction reaction (ORR) is of significant importance for the commercialization of fuel cells and metal-air batteries. Here we provide an efficient method to produce core-shell structured FeNC catalyst via a facile in-situ chelating strategy by introducing ammonia iron citrate during the polymerization process of dopamine. The influence of calcination...
Radicals can form at the edges and defect sites on graphene plane. However, the radical content of graphene is too low to be practically useful. This study demonstrates how the radical content of graphene can be enhanced and optimized simply by oxidation and reduction treatments. Graphene oxide nanosheets are produced by oxidation of graphite and different reduction methods including thermal, chemical...
A novel three dimensional (3D) printing method is developed to fabricate complex carbon/carbon (C/C) composite components. The C/C composites with the high mechanical performance are achieved by combining the selective laser sintering and the chemical vapor infiltration-thermal treatment process. The C/C composites with a maximum density of 1.5 g/cm3 and bending strength of 100 MPa are obtained. Complex...
Double-walled carbon nanotubes (DWCNTs) were synthesized by a metal-catalyst-free chemical vapor deposition method using silicon oxide nanoparticles as a catalyst. The diameters and lengths of the DWCNTs are in the ranges of 3–5nm and 1–5μm, respectively. The amount of DWCNTs produced is about 70%, while the remainder is single-walled carbon nanotubes. A heat treatment of the SiO 2 /Si substrate...
Tadpole-like carbon nanotubes (CNTs) were synthesized by chemical vapor deposition from ethanol using TiO 2 nanoparticles (NPs) as catalyst. The CNTs have a cup-stacked structure are typically less than 500nm in length, and have a non-uniform diameter with a big “head” and a smaller diameter “tail”, inside which a catalyst NP is usually encapsulated. Transmission electron microscopy (TEM)...
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