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A high areal sulfur loading in a carbon-based cathode together with a high cell capacity is key to the design of lithium-sulfur batteries guaranteeing a superior energy density for use. However, a high sulfur loading produced using traditional blade coating techniques results in many technical issues such as sluggish electron/ion transport kinetics and cracking of the electrodes. Here a well designed...
A porous graphene oxide/melamine composite sponge with highly dispersed graphene oxide sheets are prepared for high-sensitivity and self-recovery sensor of ethanol. The combination of graphene oxide and melamine with large surface area leads to sensitive to surface absorption due to avoiding the overlap of the graphene oxide sheets assembled in the sponge scaffold. The sensor exhibits a highly sensitive...
Carbon molecular sieve (CMS) membranes are a special class of nanoporous membranes with angstrom-level molecular discrimination properties, which make them appealing for separating a wide spectrum of gas-pairs. The mechanism of pyrolysis by which a polymer coil is transformed into these rigid sieves is complex; however, we present a framework that can explain this transformation. Representative polymer...
The currently available commercial lithium-ion batteries (LIBs) with a relatively low energy density cannot meet the growing demands of energy storage systems for portable electronics and electric vehicles. Lithium metal with its high specific capacity (3860 mA h/g) is regarded as one of the most promising anode materials for next-generation rechargeable lithium batteries including Li-S and Li-air...
Characterization techniques beyond microscopy, scattering and spectroscopy approaches are needed to understand and improve sub-angstrom discrimination between penetrants in carbon molecular sieve (CMS) membranes. Here we use a method based on molecular scale gas diffusion probes to understand relevant membrane properties at the required level of detail. We further use this method to consider hypotheses...
SiC nanowires were synthesized by a microwave-heating method at 1480°C for 80min under vacuum, using silicon powder, silica dioxide powder and artificial graphite as raw materials. SEM, TEM and XRD were used to investigate the microstructure of the samples and excitation light with wavelength of 240nm was used to test the photoluminescence properties of the products. Results indicated that β-SiC can...
N-doped porous carbon sheets are produced by a one-step carbonization of a selected biomass precursor, eggplant. Such a carbon synergistically inherits sheet-like microstructure and naturally rich nitrogen in eggplant and shows excellent rate performance as a supercapacitor electrode due to the short ion diffusion paths.
A Ni(OH)2-graphene hybrid with a three dimensional (3D) interconnected graphene network was prepared by a simple one-pot hydrothermal method. The 3D structure constructed of flexible and planar graphene sheets (GS) forms an effective electron transfer network and provides a continuous pore structure for ion transport. Moreover, this structure avoids the aggregation of GS and Ni(OH)2, resulting in...
Morphology-controllable carbon nanocoils (CNCs) are synthesized by thermal chemical vapor deposition using Ni nanoparticle as catalyst prepared by spray-coating method. It is found that, with the increase of number of spray-coating times, the helicity of CNCs increases whereas the average line diameter and coil pitch decrease. Additionally, infrequent Y-junction CNCs and plait-like CNCs are found...
We report a novel monolithic porous carbon constructed by the hydrothermal self-assembly of graphene oxide sheets with poly (vinyl alcohol) as the linker in the formation process of a three-dimensional (3D) structure. All the pores in this carbon have circular cross-sections and range from micropores to mesopores to macropores and are formed by the gradual removal of trapped water. This 3D graphene...
The size and surface chemistry of graphene oxide (GO) dispersed in an aqueous solution are tuned by adjusting the pH value of the parent GO hydrosol. This method is based on the protonation of the carboxyl groups on GO nanosheets (GONs) in an acidic environment and the partial removal of oxygen-containing functional groups in strong basic conditions. GONs with a high electrochemical activity can be...
An easy method to synthesize a strongly coupled cobalt ferrite/carbon nanotube (CoFe 2 O 4 /CNT) composite with oxygen bridges between CoFe 2 O 4 and reduced carbon nanotubes (CNTs) by calcining the precursor material was reported. The precursor was prepared by an electrostatic self-assembly of the exfoliated Co(II)Fe(II)Fe(III)-layered double hydroxide (CoFeFe-LDH)...
Realizing mass production of graphene materials at low cost and high quality is urgently required for their real applications. Thermal exfoliation of graphite oxide (GO) is considered as a promising strategy though it normally requires a high exfoliation temperature together with a fast heating rate, making the produced graphenes suffer from high cost and concentrated topological defects. A mild exfoliation...
A method for the preparation of a hybrid material consisting of various size silica nanoparticles attached to multi-walled carbon nanotubes (MWCNTs) is proposed. Poly (acrylic acid) oligomer was first reacted with hydroxyl groups on acid-treated MWCNTs leading to a grafted encapsulation of the MWCNTs. These were subsequently reacted with 3-aminopropyltriethoxysilane (APTES) resulting sub-grafting...
Graphene nanosheet/polymer composites were prepared using in situ reduction–extractive dispersion technology. The morphology and microstructure of the composites were examined by scanning electron and optical microscopy. The results indicate that graphene nanosheets from the reduction of graphite oxide are about 5nm thick and 1–3μm in diameter. Reduction–extractive dispersion technology can effectively...
A silica–polymer–carbon nanotube hybrid was prepared in which the nanotubes were encapsulated by poly(3-acrylaminopropylsiloxane) with silica nanospheres on the polymer surface. First, highly reactive poly(acryloyl chloride) (PAC) was grafted onto the nanotubes through the reaction of side acyl chloride groups with hydroxyl groups present on the surface of acid–oxidized nanotubes. Second, reacting...
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