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Graphene oxide (GO) is one of the most popular materials for preparing aerogels as monolith electrodes for supercapacitors because of its promising mechanical property and relatively good conductivity after thermal reduction. However, low surface area and restacking of reduced graphene nanosheets still limit the performance of the supercapacitors based on GO-derived aerogels. In this work, graphene-coupled...
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...
Silicon is one of the most attractive anode materials for next-generation lithium-ion batteries, but generally it has poor cycle performance because of its severe volume change during lithiation/delithiation and its low intrinsic electrical conductivity. We fabricated a ternary Si-based composite Si@C/GF in which Si nanoparticles were coated on a thin carbon layer by pyrolysis of phenolic resin and...
Two major issues of conventional supercapacitors, composed of a separator, two electrodes, and liquid electrolyte, are their low package energy density and the leakage of the liquid electrolyte. Therefore, great efforts have been dedicated in development of all-solid-state supercapacitors with higher energy density. Here we demonstrate a high-performance all-solid-state supercapacitor with a graphene-doped...
Ag nanoparticles (Ag NPs) supported on nitrogen-doped ordered mesoporous carbon (N-OMC) were fabricated by one-pot synthesis strategy, in which 2D hexagonally ordered mesoporous SBA-15 and aniline were used as template and carbon precursor, respectively. Furthermore, the as-prepared composite of Ag NPs supported on N-OMC (Ag NPs/N-OMC) as electrochemical sensor towards the reduction of nitrobenzene...
N-doped graphene (NG) materials have been prepared through a one-step solvothermal reaction by using o-phenylenediamine as a double-N precursor. N-doping and reduction of graphene oxide (GO) are both achieved simultaneously during the solvothermal reaction. The results of scanning electron microscopy and high resolution transmission electron microscopy measurements indicate that NG is highly crumpled...
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...
An efficient post-cure approach has been demonstrated for the kilogram-scale synthesis of high-quality ordered mesoporous carbons (OMC) by using triblock copolymer Pluronic F127 as a template, phenolic resol as a carbon precursor and polyurethane foam as a sacrificial scaffold through an organic–organic self-assembly. The effects of the concentration and the loading amount of resol on the mesostructure...
Using the addition of an O 2 to a (10,0) tube as a model case, the link between pressure and the reactivity of a carbon nanotube is examined by first principles calculations. Attaching functional groups to nanotube side-walls have been envisioned as a method to produce desired structural and electronic properties, although challenges remain for activating and controlling such reactions, especially...
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