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A hole-rich graphene framework (HGF) has been successfully prepared through lyophilization combined with thermal treatment at 200 °C. As the advanced three-dimensional (3D) graphene mesh assembly, the monolithic HGF was directly compacted to form capacitive deionization (CDI) electrode without grinding and binder so that the intact 3D structure can be reserved. The presence of original 3D structure...
Carbon materials are potential electrode materials in new energy devices such as solar cells, fuel cells, Li-ion batteries, and supercapacitors, because of their distinct advantages including low cost, high surface area, and high electric conductivity. Nitrogen doping can effectively improve the performance of carbon electrode materials, and introducing transition metals into nitrogen-doped carbon...
HNO3-oxidized single-wall carbon nanotubes (SWCNTs) and graphene oxide (GO) were ultrasonically dispersed in water to which potassium permanganate was added, and the resulting mixtures were treated under microwave radiation at 100°C for 1h or hydrothermal conditions at 100°C for 1, 5 and 10h to prepare SWCNT–GO/MnO2 composites as electrode materials of electrochemical capacitors. Results indicate...
Graphene oxide (GO) prepared by a modified Hummers method was reduced by NaBH4 at room temperature for 12h in a 0.5mg/mL GO water suspension to obtain reduced GO (RGO), using CaCl2 as a catalyst. The GO and RGO were characterized by XPS, FT-IR, UV–Vis and electrical resistivity measurements. Results show that CaCl2 improves the reduction ability of NaBH4 for oxygen-containing functional groups on...
Porous carbons (PCs) for super capacitors were prepared from coal tar pitch by a one-step microwave-assisted KOH activation with low KOH consumption. The surface area of the PC (PC2−M) made at a KOH/pitch mass ratio of 2 with microwave heating for 30min reaches 1786m2/g. The electrochemical performance of the PC electrode for super capacitors was evaluated in different electrolytes including KOH,...
Three condensed polynuclear aromatic resins with different molecular weights (MWs) and MW distributions were heated at 900, 1500, 2200, 2600 and 3000°C for 2h. The resulting carbons were characterized by XRD, helium pycnometry and a powder electrical resistance test. The graphitic, amorphous and turbostratic constituents in the carbons were obtained from XRD. Results showed that both the MW and the...
Natural graphite was modified by oxidation with a mixture of sulfuric acid (98%) and hydrogen peroxide (30%) with a volume ratio of 1:1, followed by a heat treatment under argon at 900°C for 3h to overcome its disadvantages of the presence of active surface groups and volume changes produced by the intercalation/deintercalation of Li ions. Results showed that the graphitic layers of the expanded graphite...
Silver nanostructures have been extensively studied as the substrates for surface-enhanced Raman spectroscopy (SERS) due to their strong plasmonic enhancement effect and low loss at optical frequencies. However, unprotected silver nanostructures are chemically unstable under practical conditions, leading frequently to erratic SERS signals and possibly unreliable interpretation of experimental results...
The dependence of the absorbance of few-layer graphene oxide on reduction level is shown to originate from different inter- and intra-band transitions using infrared–visible spectroscopy. In addition, the band-gap of reduced graphene oxide is tunable from 2 to 0.02eV depending on its reduction level. These results indicate that reduced graphene oxide possesses great potential as a candidate for photodetection...
Nitrogen-, phosphorous- and boron-doped carbon nanotubes (N-CNTs, P-CNTs and B-CNTs) were prepared by a chemical vapor deposition method using xylene as carbon source and aniline-NH 3 , triphenyl phosphine and triethyl borate as nitrogen, phosphorous and boron precursors, respectively. By tailoring the composition of reactants and reaction atmosphere, N-CNTs with nitrogen contents from 0%...
Water vapor-assisted chemical vapor deposition was used to prepare vertically-aligned carbon nanotubes (ANTs) on a quartz substrate by using ferrocene as a catalyst precursor and xylene as a carbon source. The morphologies of the ANTs were investigated by TEM and SEM. Results showed that under optimized growth conditions ANTs were grown on the substrate with an area of 60×140mm 2 and a thickness...
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