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In spite of graphene and Ti 3 C 2 MXene sheets with various significant properties and function, the performance characteristics of their hybrid in organic coating have been rarely discussed. Herein, the Ti 3 C 2 /graphene hybrid (M-G) with wrapping structure was successfully prepared and as filler was added into epoxy coating (MG-EP). Their tribological performance against Al 2 O 3 and Si 3 N 4...
A novel carbon allotrope, T-carbon, is attempted to obtain by using plasma enhanced chemical vapor deposition (PECVD) on the substrates of polycrystalline diamond and single crystalline diamond, respectively. Our measured x-ray diffraction, Raman and infrared spectra of the new form of carbon are in good agreement with the calculated results of T-carbon, and the lattice parameter meets with the results...
Graphene has received abundant attentions in many applications because of its extraordinary properties. Liquid-phase exfoliation is one of the most important methods to obtain graphene from graphite. However, due to strong van der Waals interaction force, it is still extremely challenging to further improve the exfoliation efficiency. Here we report that by carrying out reductions with the oxygenic...
Despite graphene (G) is impermeable to all molecules and with excellent chemical stability, conductive G is cathodic to most metals and can aggravate metal corrosion at exposed metal-coatings interfaces. This effect may accelerate dangerous localized corrosion and potentially impedes its applications in metal protection. Here, we present successful synthesis of nonconductive G (FmG) through the Diels-Alder...
Graphene hydrogel (GH) has attracted increasing attention in energy storage and conversion, pollutant adsorption, catalysis, sensors and tissue engineering applications. However, a good understanding of the structure-property relationship is essential to precisely tune their properties. In this work, a pH assisted hydrothermal process was used to synthesize reduced graphene oxide (rGO) hydrogels with...
The electrocatalytic performance of the carbon supported catalysts can be effectively influenced by controlling the atomic structure of carbon materials. Herein, novel graphene nanospheres (GNs) composed of graphene nanoflakes are prepared through a modified arc-discharge method using toluene as carbon source. It is explored that these GNs possess high density of lattice disorder as well as the oxygen-containing...
Graphene quantum dot (GQD), which is the latest addition to the family of nanocarbon materials, promises a wide spectrum of novel applications. Here, we for the first time demonstrate the use of GQD and sulfonated GQDs (SGQDs) as quasi-homogenous catalysts for chemo-catalysis. Specifically, we demonstrate that SGQDs are able to selectively and effectively degrade carbohydrates (eg. fructose, glucose,...
In situ contrast-matched neutron scattering was used to probe the electrolyte infiltration behavior of activated supercapacitor carbon electrodes using an aquoeus 1 M NaCl solution. It was found that only about 20% of the pore volume was infiltrated at chemical equilibrium. The partial infiltration can be attributed to the co-existence of hydrophilic and hydrophilic pores. The study suggests that...
Recently, the electrogenerated chemiluminescence (ECL) of carbon nanodots (C-dots) have been detected and the signal is applied for sensitive determination of environmental pollutes and biological active molecules. A few of researches have been reported on the mechanisms of C-dots that the electro-generated cation and anion intermediates undergo electron-transfer annihilation to give off strong ECL...
Inspired by the highly efficient water transport presented in hourglass-shaped aquaporin channels, molecular dynamics simulations were conducted to study water desalination in carbon nanocones (CNCs). Their desalination performance (salt rejection, water flow) depends on the cone size, angle, and flow direction (nonequilibrium). Free energy calculations reveal that ultrasmall CNCs with apex angles...
In recent years, the oxygen reduction reaction (ORR) performance of N-doped carbon catalysts has made great progress and is now comparable to that of commercial Pt/C. However, the rich porous features of N-doped carbon catalysts give them a very low bulk density, which leads to problems in oxygen mass transfer due to water flooding when they are used as the cathode in fuel cells. Herein, a controllable...
Layered two-dimension (2D) materials have attracted substantial interest as alternative catalysts for hydrogen evolution reaction (HER). However, there exists a significant challenge in that is the only limited density of active sites concentrated at the layer edges. Herein, for the first time, graphdiyne (GD), a new generation of 2D carbon allotrope developed from the graphene family, is found to...
The rational design and preparation of hierarchically porous carbons feature high on the wish list of academia and industry alike. However, creating interconnected pores of distinct dimensions is no easy task. Starting from the precursor design, we present a novel synthesis strategy of porous carbons that much enhances the pore interconnectivity. The 500 °C pyrolysis of chelated Mg and Fe nitrilotriacetates...
Template method has been used as an important method to prepare porous materials. However, there are few reports about template method employing potassium chloride as template. Here, potassium chloride is employed as a template to prepare the porous carbon, and transition metal nitrates (Fe(NO3)2,d Co(NO3)2, Ni(NO3)2) are introduced to catalyze graphitization and to result different carbon structure...
Cyclic microbridge tests were applied to investigate the mechanical properties of the 100-to-400-nm-thick graphene oxide membranes. The effective Young’s moduli of different thickness graphene oxide membranes were derived and proved to be size dependent. The self-reinforcing behavior of graphene oxide membranes, which exhibits as an increase in Young’s modulus after cyclic loading, was observed and...
Reliability is one of the key specifications of a system. For graphene synthesis by chemical vapor deposition (CVD), previous studies have shown that a trace amount of oxidants can significantly affect graphene growth, either positively or negatively. Other than deliberately introducing oxygen, oxidant impurities may be introduced by the air leaked into the system or from impurities of the reaction...
To optimize the synergistic effects among hydrogen bond donors, halogen anions and basic sites, we synthesized a series of graphene oxide (GO) materials multi-functionalized with silanol group, multi-cationic quaternary ammonium salt and tertiary amine in a one-pot approach. Hexamethylenetetramine which is cheap and rich with tertiary amine was used as precursor. As characterized by elemental analysis...
In this study, the mesoporous carbon hollow spheres (MCHS) have been prepared through a facile hard-template etching strategy. It is confirmed that the tetrapropoxysilane (TPOS) has distinct influence on the dispersity, hollow cavity and shell thickness of MCHS. Furthermore, MCHS with different construction can regulate dielectric and microwave absorption effectively. We also proved that the generated...
All carbon-electrode is ideal for supercapacitor, but synthesizing macro-level >3 GPa strong porous carbon electrode is challenging. Here, we presented an approach of synthesizing robust flexible “carbon-concrete” films integrating carbon fibers, graphene and hierarchical porous activated carbon. The method involved electrochemically spreading of carbon fiber bundles and in-situ activation of cellulose...
Lithium-sulfur (Li-S) batteries are considered as a promising candidate for large-scale applications such as electrical vehicles (EVs) because of their high theoretical capacity, large energy density and low cost. However, due to the shuttling effect of polysulfides, the continuous capacity fading during cycling remains a substantial bumper for the practical use of Li-S batteries. Here, reduced graphene...
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