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The fabrication of advanced materials for the effective adsorption and monitoring toxic gases in ambient air is highly desirable. The present study reported on the preparation of three-dimensional (3D) porous graphene aerogel (GA) for efficient adsorption and preconcentration of chemical warfare agents (CWAs). A template assisted freeze casting followed by thermal reduction approach was employed to...
This research is focused in the missing link between the specific surface area of carbons surface and their electrochemical capacitance. Current protocols used for the characterization of carbons applied in supercapacitors electrodes induce inconsistencies in the values of the interfacial capacitance (in F m−2), which is hindering the optimization of supercapacitors. The constraints of both the physisorption...
The sodium-ion battery (SIB) has been considered as one of the most important and promising candidates for large-scale storage of electrical energy. Developing cost-effective but high-performance anode materials is crucial for SIBs. Herein a hard carbon-based anode material is synthesized from polyurethane foam. In order to boost its performance, NaCl, one of the most abundant and low-cost salts in...
Thin films of carbon-rich boron carbonitride (h-B-C-N) were prepared by low pressure chemical vapor deposition from C2H2, BCl3, NH3 and H2 mixtures. After an overall investigation of the deposition kinetics and the composition of the solid, four deposition conditions were selected to study in details the structure, the oxidation behavior and the mechanical properties of the deposits. The influence...
Commercially available Cu foils are leading candidates as substrates employed for the generation of large-area graphene using chemical vapour deposition (CVD) techniques. However, the growth of high-quality graphene on Cu foils is often hindered by contamination particles, which will also be detrimental for many potential applications of graphene. Here we investigate the influence of typical substrate...
It is notably challenging to fabricate heavily heteroatom-doped porous carbonaceous materials with narrow ultramicropore size distributions for highly effective mixed-gas separation. In this study, new carbon-based materials with narrow ultramicropore size (<7 Å) distributions (>95%) and high N doping contents (>10 at%) are fabricated through the pyrolysis of a perchloro-substituted porous...
Graphene quantum dots (GQDs) with unique and tunable physical properties have been the focus of considerable attention because of their potential for electronic and photonic applications. In this work, the electronic polarizability and second hyperpolarizability of hexagonal GQDs were investigated using density functional theory. The effects of size, substituent, and incident frequency of hexagonal...
A three-dimensional (3-D) porous structure was designed based on carbon dot (CD)-supported copper sulphide (CuS)-decorated graphene oxide (GO) hydrogel for using in a high-performance asymmetric supercapacitor device to improve the specific capacitance, cyclic stability and energy density of CuS as well as GO based supercapacitors. CD coated CuS (CuS@CD) decorated GO hydrogels (CuS@CD-GOH) were prepared...
Novel covalent adducts of core modified (mono-thiaporphyrin and dithiaporphyrin), core modified expanded (trithiasapphyrin) porphyrin with graphene oxide are synthesized to improve the dispersability in organic solvents. The nonlinear, photo physical, thermal properties and morphology of graphene oxide -porphyrin hybrid materials are investigated. The covalent bonding of mono-thiaporphyrin, di-thiaporphyrin...
Carbon nanotube (CNT) fibers are interesting alternatives to carbon fibers as fibrous reinforcement. However, good interfacial adhesion between the fibers and the matrix is difficult to control. Wetting of the fiber reinforcement with the matrix strongly determines the interfacial strength. Therefore, accurate characterization of the wettability of CNT fibers is one of the most important cornerstones...
Three-dimensional hybrid foams of SiC nanowires (SiC NWs) coated and bonded with nanostructured lamellar carbon films are, herein synthesized for the first time, by combination of unidirectional freeze drying and carbonization techniques. The crystallinity of the carbon films was tunable from amorphous carbon to graphene-like carbon by heat treatment of the as-received hybrid foams to different temperatures...
Doping of N atoms into the carbonacous materials can generate extrinsic defects and more active sites, improve electrode wettability and also broaden the interlayer distance of carbon, hence promote Na storage capacity and high rate capability. Herein, we report the nitrogen-doped carbon nanosheets materials (PPyCs) obtained from pyrolysis of Polypyrrole coated graphene oxides. The pyrolysis temperature...
Chains of carbon atoms in the sp1 hybridization are the one-dimensional analog of graphene. The first experimental studies of electrical transport in atomic carbon chains have shown a much lower conductivity than the quantum conductance limit. Here we explain, experimentally and by ab-initio transport modeling, the limited conductivity by studying the influence of carbon contacts in different hybridization...
We have demonstrated a rapid and facile approach for preparing nitrogen doped and hierarchically porous carbons (NHPCs) using renewable chitosan as precursor via microwave carbonization in only 10 min. In microwave carbonization, ZnCl2 impregnated in chitosan hydrogel serves as microwave absorber, chemical activation agent and porogen. The porous textures of NHPCs can be modulated by altering the...
Carbon nanosheets were successfully prepared from easily available and low-cost petroleum asphalt via a facile and recyclable molten-salt method. The as-made carbon nanosheets exhibit excellent performance on energy storage both for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs): as the anode of LIBs, they provide a high reversible specific capacity (729 mAh g−1 at 100 mA g−1), excellent...
Recently, two-dimensional van der Waals materials such as graphene and hexagonal boron nitride have attracted interest as research topics. The two-dimensional material of polyphenylene superhoneycomb network (PSN) is similarly interesting because it is a type of periodic porous graphene. In this paper, we report a first-principles study of the geometric and electronic properties of vertical heterostructures...
Ceramics are widely used as engineering materials due to their high strength; however, their lack of plasticity is a major drawback. We report that dual-phase amorphous carbon (a-C) reveals high yield strength of ∼E/11 (E is elastic modulus, and E/10 is theoretical limit for ideal material) and large plasticity of ∼70% at room temperature in uniaxial compression tests. To the best of our knowledge,...
This article reports a study on catalytic growth of diamond-like carbon (DLC) on the Fe3C-containing carburized surface layer of M50NiL steel through a single-step plasma-assisted carburizing process. The catalytic effect of Fe3C on DLC growth was investigated by means of X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission...
A novel nanocomposite of Co0.85Se nanotubes with reduced graphene oxide (Co0.85Se/RGO) is prepared by a facile hydrothermal approach coupled with in situ selenization, which is applied as counter electrode in dye-sensitized solar cells. Electrochemical analysis shows that the Co0.85Se/RGO composite displays a higher electrocatalytic activity for the reduction of triiodide respect to its single components...
Sunlight-driven electrolytic splitting of water is a promising route to hydrogen production, and widespread implementation has called for the development of inexpensive, robust and large-scale electrodes. Here, nickel nanoparticles partially embedded into carbon fiber cloth (NiΦCFC) is prepared on a large scale (e.g., 40 cm × 40 cm) via a metal-mediated pitting process, which is adopted to fabricate...
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