We wish to report the growth of S-doped graphene (SG) with high sulfur content (5 at%, determined by XPS) using chemical vapor deposition (CVD). The nano-sized Fe/CaCO3 was employed as a catalyst, flow rate-controlled acetylene gas was introduced into the CVD furnace as a carbon resource and the solid sulfur powder was placed in the first zone of CVD as a sulfur resource. The structures, sizes and specifications of the prepared SGs were determined and confirmed by field emission scanning electron microscopy, transmission electron microscopy, X-ray energy dispersive spectroscopy, elemental mapping, powder X-ray diffraction, Raman spectroscopy and X-ray photoelectron spectroscopy analyses. The surface area and porosity of SG were obtained via a low-temperature N2 physisorption. The presented method could be employed as an efficient, fast and cheap technique for the preparation of SG.

A simple synthesis of sulfur-doped graphene using sulfur powder by chemical vapor deposition

In this study, we synthesized two forms of the polypeptide-based rod–coil diblock copolymer poly(ethylene oxide-b-γ-benzyl-l-glutamate) (PEO-b-PBLG), comprising hydrophilic PEO as the coil segment ...

Secondary Structures of Polypeptide-Based Diblock Copolymers Influence the Microphase Separation of Templates for the Fabrication of Microporous Carbons

A new nano lead-doped mesoporous carbon composite as negative electrode additives for ultralong-cyclability lead-carbon batteries

In this study, samples of activated mesoporous carbon are fabricated with pore structures with cylinder and gyroid nanostructures through the templating effect of amphiphilic poly(ethylene oxide-block-caprolactone) (PEO-PCL) and by using specific resol/PEO-PCL weight ratios (e.g., 60:40 for cylinders; 55:45 for gyroids). After carbonization and KOH activation, the activated mesoporous carbons were tested as electrode materials for electric double-layer capacitor (EDLC) supercapacitors. The electrochemical properties were examined by using three-electrode (6 m KOH(aq) as electrolyte) and CR2032 coin-cell (1 m tetraethylammonium tetrafluoroborate (TEABF4 )/CN as the electrolyte) systems. The gyroid carbon samples provided specific capacitances higher than those of the cylinder carbon samples in both aqueous and organic systems: 155 F g-1 compared with 135 F g-1 in 6 m KOH(aq) , and 105.6 compared with 96 F g-1 in 1 m TEABF4 /MeCN, after 100 charge/discharge cycles. It is suspected that the bi-continuous mesochannels of the gyroid-type activated mesoporous carbons provided a relatively higher effective adsorption surface area; in other words, the greater surface area for energy storage originated from a moderate pore size and an interconnected pore structure.

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Enhancing cycle performance of lead-carbon battery anodes by lead-doped porous carbon composite and graphite additives

Novel lead-graphene and lead-graphite metallic composite materials for possible applications as positive electrode grid in lead-acid battery

Synthesis of and characterization of freestanding, high-hierarchically structured graphene-nanodiamond films

Currently, aluminum-ion batteries are considered attractive energy storage devices because aluminum is an inexpensive, widely available, environmentally friendly, low-flammable, and high recyclable electrode material. Electrochemical cell simulating the work of an aluminum-ion battery with aluminum-graphene nanocomposite–negative electrode, positive graphene electrode, and chloroaluminate ionic liquid 1-ethyl-3-methylimidazolium chloride has been designed and tested. The cell exhibits excellent performance and long shelf life. The aluminum-graphene composite is not prone to oxidation over a long period of time. Consequently, the negative electrode surface does not undergo passivation by trace amounts of water and oxygen in the electrolyte during storage, which considerably prolongs the battery shelf life. The analyzed cell delivered stable performance across a wide range of charge/discharge rates for several thousands of cycles without any noticeable loss in capacity and Coulombic efficiency. It has almost 100% Coulombic efficiency at high charge/discharge current densities and retains its characteristics after a 7-day current-free period.

Fast-charged aluminum-ion battery with aluminum-graphene nanocomposite anode

A novel electrochemical method for the synthesis of boron doped graphene in the molten salt electrolyte

A hierarchically structured carbon film (HSC) synthesised during glucose interaction with a halide melt on a molten magnesium catalyst at temperatures is composed of sp, sp2, and sp3 hybridised carbon atoms as well as carbonyl and carboxyl functional groups according to X-ray photoelectron spectroscopy. The hierarchically structured carbon film reduces up to 100% of hexavalent chromium ions from 0.05 and 0.1 M potassium dichromate solutions in a neutral medium. The interaction is instantaneous, and Cr3+ is found in the solution in the form of stable aqua complexes. Trivalent chromium ions are adsorbed only on the film's developed side; no chromium was found on its smooth side. X-ray photoelectron spectroscopy indicates that oxygen content in the carbon film increases by 20% in the form of carbonyl groups. The adsorptive ability of the HSC composite is high and, depending on the concentration of the initial bichromate, reaches 111 mg/g at pH 7, which is much higher than most carbon fibres, carbon nanomaterials and oxide sorbents. The method of reducing hexavalent chromium and adsorbing trivalent chromium is environmentally friendly. Its application will reduce Cr6+ and adsorption of Cr3+, a one-step process without using any acids.

V. A. Yolshina

Papers

Novel lead-graphene and lead-graphite metallic composite materials for possible applications as positive electrode grid in lead-acid battery

Synthesis of and characterization of freestanding, high-hierarchically structured graphene-nanodiamond films

Fast-charged aluminum-ion battery with aluminum-graphene nanocomposite anode

A novel electrochemical method for the synthesis of boron doped graphene in the molten salt electrolyte

SEM and XPS Study of Cr6+ Removal from Wastewater via Reduction and Adsorption by Hierarchically Structured Carbon Composite in Neutral Media