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Thanks to their light-weight, wearing comfort, and amenability to be woven into textiles, solid-state fiber supercapacitors (FSCs) have been considered as promising energy storage devices for wearable electronics. Carbon fibers (CFs) have the merits of both superior mechanical strength and conductivity, excellent flexibility, doped by heteroatoms, good knittability/weavability, and most importantly...
Fabricating microwave absorbers (MA) with strong attenuation capability and lightweight is still a challenge problem, which limit their further applications in our daily life. Herein, magnetic vortex core-shell Fe 3 O 4 @C nanorings (FNR-C) with excellent microwave absorption property have been successfully prepared by a facile strategy. Electron holography analysis is carried out to detect the magnetic...
Exploration of cost-effective and highly durable carbon-based multifunctional electrocatalysts for energy conversion and storage devices (e.g., metal-air batteries) is of critical significance. Herein, we present a unique worm-like structure of hierarchically porous nitrogen-doped graphene (N-rGO) embedded with cobalt nitride (Co 5.47 N) nanoparticles (named as Co 5.47 N@N-rGO) by tannic acid assisted...
Hexagonal tubular carbon nitride (CN) was successfully fabricated from hexagonal rod-like supramolecular precursor. The supramolecular precursor was synthesized by hydrogen bonded self-assembly of melamine and cyanuric acid, in which cyanuric acid was from in-situ hydrolysis of melamine under haloid acid-assisted hydrothermal environment. The obtained hexagonal tubular CNs not only possess hierarchical...
Understanding the effect of minor elements such as oxygen and nitrogen on the growth of graphene is crucial to fabrication of graphene single crystals (GSC) with large grain size. In this study, we investigate the nucleation and growth behavior of graphene domains on commercial copper foils as a function of oxygen partial pressure in the chemical vapor deposition (CVD) chamber. To achieve repeatable...
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...
Relative high filling ratio and poor reflection loss performance in low frequency are two major challenges in promoting microwave response of current carbon material which could be overcome by rational structure engineering. Herein, hollow graphite spheres embedded in porous amorphous carbon matrix has been prepared by etching Fe3Ni/C composites derived from Fe2Ni MIL-88 nanorods. Construction of...
Despite significant advances in preparing functional carbon and transition metal oxide (TMO) nanomaterials arising from metal–organic frameworks (MOFs), the TMO nanoparticles (NPs) incorporated on 2D carbon-nitrogen nanosheet arrays constructed from MOF structure have not been explored before. Herein, a facile self-assembly methodology for MOF nanofibers derived Co3O4 NPs doped carbon-nitrogen nanosheet...
Rational design of low-cost and highly-efficient bifunctional oxygen electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is currently critical for renewable energy storage and conversion devices. Herein, we represent a series of three-dimensional porous B and N co-doped graphene aerogels (BN-GAs) using NH4B5O8 as precursor for B and N source by hydrothermal method...
The present work develops an atomic layer reduction (ALR) method to accurately tune oxidation level, electrical conductance, band-gap structure, and photoluminescence (PL) response of graphene oxide (GO) sheets. The ALR route is carried out at 200 °C within ALR cycle number of 10–100. The ALR treatment is capable of striping surface functionalities (e.g., hydroxyl, carbonyl, and carboxylic groups),...
Superhydrophobic surface has attracted enormous interests due to its attractive potential applications. Here, we prepare all carbon nanotube hybrid films simply by depositing multi-walled carbon nanotubes on strong single-walled carbon nanotube films through vacuum filtration. The hybrid films behave some exciting superhydrophobic properties of a large water contact angle of 152° and an ultra-low...
In this work, we develop a specifically engineered variant of carbonized melamine foam (cMF) by carrying systematic structural modifications with Au nanoparticles, graphene (G), Fe3O4 (IO) and poly(dimethyl siloxane) (PDMS). Our main goal is to construct a lightweight and flexible cMF composite with tailored 3D hierarchical architecture for achieving high-efficiency in electromagnetic interference...
In this work, three-dimensional (3D) amine-terminated ionic liquid (IL) covalently functionalized graphene/Pd composite aerogels are successfully fabricated via a facile and green reduction-inducing self-assembly method. The morphology and composition of the obtained 3D IL-rGO/Pd composite aerogels are studied by means of TEM, SEM, XRD, FTIR, XPS, BET, and Raman spectroscopy. In those composites,...
While metal is commonly used to construct electromagnetic metamaterials, herein carbon aerogel constitutes the first example of application as building blocks for metamaterials of low density. The carbon aerogel is synthesized by the sol-gel polymerization of resorcinol with formaldehyde followed by supercritical fulid drying and carbonization. The resulting nanostructure of carbon aerogel is adjusted...
Geometry-controllable three-dimensional reduced graphene oxide (rGO) network layers on carbon nanotube (CNT)-Fe3O4 films are assembled by electrophoresis. The fabricated microstructure consists of an interconnected network of graphene and carbon nanotubes with magnetic Fe3O4 particles as the fast transport channel of charge carriers for high electrical conductivity. Building upon this unique network...
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...
A self-supporting and flexible activated carbon/carbon nanotube/reduced graphene oxide (AC/CNT/RGO) film has been rationally designed for constructing high-performance supercapacitor. The AC/CNT/RGO film is prepared by anchoring the AC particles with a 3D and porous framework built by hierarchically weaving the 1 D CNT and 2D RGO using their intrinsic van der Waals force. The CNT network is beneficial...
Gel column chromatography is regarded as one of the most efficient methods for the large-scale separation of carbon nanotubes. However, the high cost of commercially available gel medium is a serious problem for industrial-scale production. A low-cost gel is therefore highly desired. In this study, we report a facile method to synthesize guar gum gel for the metal/semiconductor separation of carbon...
We report a single-step growth process of graphene nanostripes (GNSPs) by adding certain substituted aromatics (e.g., 1,2-dichlorobenzene) as precursors during the plasma enhanced chemical vapor deposition (PECVD). Without any active heating and by using low plasma power (≤60 W), we are able to grow GNSPs vertically with high yields up to (13 ± 4) g/m2 in 20 min. These GNSPs exhibit high aspect ratios...
Development of novel van der Waals (vdW) heterostructure is of great interest and significant to improve the performance of photovoltaic, photocatalytic and optoelectronic devices. In this work, the C2N/β-Sb vdW heterostructure has been investigated by the first-principles calculations. It is found that the pristine C2N/β-Sb vdW heterostructure is a type-ΙΙ heterostructure with a direct band gap of...
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