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It is a great challenge to fabricate lightweight microwave absorption materials (MAMs) with strong electromagnetic wave attenuation over wide frequency range. In this work, ultralight multiwalled carbon nanotube (MWCNT)/graphene foams (CGFs) are prepared through a facile solvothermal method and their microwave absorption (MA) properties are fully investigated. The CGFs exhibit tunable complex permittivity...
Both synthesis method and heteroatom doping could tailor graphene properties and promise its practical application. Here, a facile electrolytic route was developed to prepare amino-functionalized graphene, which could be directly used to build chemical sensor electrode. In this method, graphene oxide (GO) was electrolyzed in ethylenediamine aqueous solution to induce ammonization and electrochemical...
Investigation of interfacial reactions between Si and multi-walled carbon nanotubes (MWCNTs) and their effect on lithium storage properties has not yet been reported. Herein, deposition of amorphous Si nanoparticles on MWCNTs is reported by a low pressure chemical vapor deposition. The structural and interfacial evolutions upon high-temperature annealing are systematically investigated, and the results...
Macroscopic lossy foam has been expected to be the most promising candidate for lightweight high-performance microwave absorption (MA). However, inferior MA behaviors of conventional foams reported previously are disappointing. The emerging graphene foam (GF) has broken this paradoxical state of affairs. Here, series of GFs with various chemical compositions and physical structures have been prepared...
Binder-free, graphitic, hierarchically porous carbon nanofiber (CNF) electrodes with in-situ encapsulated Co–Ni catalysts are synthesized with electrospinning as an efficient oxygen electrode for Li–O2 batteries (LOBs). The inherently interconnected, graphitic network makes it unnecessary to include binders and carbon additives, therefore eliminating the possible side reactions from binder and facilitating...
Effects of oxidation on in-plane shear strength and interlaminar shear strength of two-dimensional carbon fiber reinforced silicon carbide composites (2D C/SiC) were studied based on the corresponding shear damage mechanisms. The results showed that oxidation had resulted in severe degradations of the two strengths, however, it had little influence on the shear failure mechanisms. Under in-plane shear...
Carbon fiber/Fe-based soft magnetic alloys coaxial composites have been prepared and the enhanced giant magnetoimpedance effect has been investigated by applying a tensile stress. Carbon fibers as the inner core are commercially available, the outer layers respectively are Fe, Ni, FeNi and FeCo alloys, which are fabricated by electrochemical deposition. The composite with Fe80Ni20 alloy shows the...
To meet the higher requirement of energy storage units, novel devices combining high power performance of supercapacitor and high energy density of Li-ion battery are in urgent demand. Herein we designed and fabricated a Li-ion capacitor device, which is composed of an electrochemical double layer capacitance electrode as the positive electrode and a Li-ion battery type electrode as the negative electrode...
S-doped graphene has attracted extensive interest in recent years due to its high catalytic activity. However, most of the previously reported S-doped graphene materials present diverse types of S-bonding configurations, it is hard to distinguish which configuration is mainly responsible for the catalytic activity. Here, homogeneous thiophene S-doped graphene can be synthesized through solid-state...
A series of reduced graphene oxide (RGO) colloids with different amounts of surface charges was prepared. The change in surface charge at different pH values was detected by zeta potential measurement, and the evolution of oxygen-containing functional groups attached to the RGOs was analysed by Fourier-transform infrared spectroscopy and ultraviolet-visible absorption spectroscopy. Results showed...
The development of metal-free catalyst for oxygen reduction reaction (ORR) is one of the most challenging tasks in fuel cells. Heteroatom doped graphenes have been recognized as the promising candidate. In this work, we have developed a one-pot hydrothermal approach towards three-dimensional nitrogen and sulfur co-doped graphene frameworks (N/S-GFs) employing graphene oxide and ammonium thiocyanate...
Purified carboxylated multiwalled carbon nanotubes (MWCNTs) with different agglomeration propensities were evaluated in mice following a single dose intravenous injection. Both agglomerated and the well suspended MWCNTs were taken up by mononuclear phagocyte system organs. MWCNTs with higher degree of agglomeration were retained in lungs and later in the liver and were not eliminated completely in...
Multi-walled carbon nanotubes (MWNTs) were electrochemically oxidized by a constant-potential electrolysis method and then investigated in detail using scanning electron microscope, transmission electron microscope, FT-IR, electrical impedance spectroscopy, and cyclic voltammetry. The FT-IR spectra showed that the amount of hydroxyl generated on the surface of MWNTs increased with increasing the electrochemical...
Electrochemical synthesis of FeCl 3 -graphite intercalation compounds (GICs) in aqueous solution was studied by chronoamperometric, chronopotentiometric and cyclic voltammetric methods. Using 6-10m FeCl 3 -aqueous solutions, FeCl 3 -GICs with stage 2-6 and/or mixed stage structures were synthesized by an anodic oxidation, evidenced by both X-ray diffraction patterns and Raman...
The mechanical properties of flexible graphite sheets made by exfoliated graphite flakes have been investigated in term of the density changes and the flake size variation. The fracture toughness of flexible graphite sheets has been characterized using the concept of essential fracture work (w e ). The experimental results indicate that both tensile strength and the fracture toughness monotonically...
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