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Journal ArticleDOI

Solvothermal synthesis of Zinc sulfide decorated Graphene (ZnS/G) nanocomposites for novel Supercapacitor electrodes

TL;DR: In this article, a series of composites with different loadings of graphene is synthesized and tested for its electrochemical properties, and the specific capacitance of the electrodes are evaluated from cyclic voltammetry (CV) studies.
About: This article is published in Electrochimica Acta.The article was published on 2015-10-01. It has received 180 citations till now. The article focuses on the topics: Cyclic voltammetry & Graphene.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a ball milling approach for achieving few layered molybdenum disulfide (MoS 2 ) via exfoliation from their bulk was demonstrated.

175 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrated the sonochemical preparation of cubic RuS 2 nanoparticles with average size in the range of 20nm and investigated their supercapacitive properties in detail using cyclic voltammetry, charge discharge analysis and electrochemical impedance spectroscopy, respectively.

156 citations

Journal ArticleDOI
TL;DR: In this paper, the preparation of nanoarchitectured MoS2 sheets grown on Mo foil via hydrothermal method and examined its use as a binder free electrode for supercapacitors.

153 citations

Journal ArticleDOI
Yuanxun Chen1, Dan Ni1, Xiaowei Yang1, Congcong Liu1, Junlin Yin1, Kefeng Cai1 
TL;DR: In this paper, a Zn-doped Ni-based metal-organic framework (Ni-MOF) material with honeycomb-like hierarchical spherical structure is synthesized by a microwave-assisted method using HCl as the modulator for the first time.

152 citations

Journal ArticleDOI
TL;DR: Graphene-ZnO nanocomposites were prepared by a facile solvothermal approach, and the electrochemical properties were examined by measuring the specific capacitance in 6M KOH solution using cyclic voltammetry and galvanostatic charge discharge techniques as mentioned in this paper.

146 citations

References
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Journal ArticleDOI
01 Jun 2007-Carbon
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.

12,756 citations

Journal ArticleDOI
20 Jul 2006-Nature
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
Abstract: The remarkable mechanical properties of carbon nanotubes arise from the exceptional strength and stiffness of the atomically thin carbon sheets (graphene) from which they are formed. In contrast, bulk graphite, a polycrystalline material, has low fracture strength and tends to suffer failure either by delamination of graphene sheets or at grain boundaries between the crystals. Now Stankovich et al. have produced an inexpensive polymer-matrix composite by separating graphene sheets from graphite and chemically tuning them. The material contains dispersed graphene sheets and offers access to a broad range of useful thermal, electrical and mechanical properties. Individual sheets of graphene can be readily incorporated into a polymer matrix, giving rise to composite materials having potentially useful electronic properties. Graphene sheets—one-atom-thick two-dimensional layers of sp2-bonded carbon—are predicted to have a range of unusual properties. Their thermal conductivity and mechanical stiffness may rival the remarkable in-plane values for graphite (∼3,000 W m-1 K-1 and 1,060 GPa, respectively); their fracture strength should be comparable to that of carbon nanotubes for similar types of defects1,2,3; and recent studies have shown that individual graphene sheets have extraordinary electronic transport properties4,5,6,7,8. One possible route to harnessing these properties for applications would be to incorporate graphene sheets in a composite material. The manufacturing of such composites requires not only that graphene sheets be produced on a sufficient scale but that they also be incorporated, and homogeneously distributed, into various matrices. Graphite, inexpensive and available in large quantity, unfortunately does not readily exfoliate to yield individual graphene sheets. Here we present a general approach for the preparation of graphene-polymer composites via complete exfoliation of graphite9 and molecular-level dispersion of individual, chemically modified graphene sheets within polymer hosts. A polystyrene–graphene composite formed by this route exhibits a percolation threshold10 of ∼0.1 volume per cent for room-temperature electrical conductivity, the lowest reported value for any carbon-based composite except for those involving carbon nanotubes11; at only 1 volume per cent, this composite has a conductivity of ∼0.1 S m-1, sufficient for many electrical applications12. Our bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.

11,866 citations

Journal ArticleDOI
TL;DR: In this article, a general approach for the preparation of graphene−metal particle nanocomposites in a water−ethylene glycol system using graphene oxide as a precursor and metal nanoparticles (Au, Pt and Pd) as building blocks.
Abstract: Graphene sheets, which possess unique nanostructure and a variety of fascinating properties, can be considered as promising nanoscale building blocks of new composites, for example, a support material for the dispersion of nanoparticles. Here, we present a general approach for the preparation of graphene−metal particle nanocomposites in a water−ethylene glycol system using graphene oxide as a precursor and metal nanoparticles (Au, Pt and Pd) as building blocks. These metal nanoparticles are adsorbed on graphene oxide sheets and play a pivotal role in catalytic reduction of graphene oxide with ethylene glycol, leading to the formation of graphene−metal particle nanocomposites. The typical methanol oxidation of graphene−Pt composites in cyclic voltammograms analyses indicated its potential application in direct methanol fuel cells, bringing graphene−particle nanocomposites close to real technological applications.

1,478 citations

Journal ArticleDOI
TL;DR: In this article, a metal nanoparticle-graphene composite with a partially exfoliated graphene morphology derived from drying aqueous dispersions of platinum nanoparticles adhered to graphene is presented.
Abstract: Aggregation of isolated graphene sheets during drying graphene dispersions leads to a loss of its ultrahigh surface area advantage as a two-dimensional nanomaterial. We report a metal nanoparticle-graphene composite with a partially exfoliated graphene morphology derived from drying aqueous dispersions of platinum nanoparticles adhered to graphene. Platinum nanoparticles with diameters spanning several nanometers are adhered to graphene by a chemical route involving the reduction of metal precursors in a graphene dispersion. Face-to-face aggregation of graphene sheets is arrested by 3−4 nm fcc Pt crystallites on the graphene surfaces, and in the resulting jammed Pt−graphene composite, the Pt acts as spacers resulting in mechanically exfoliated, high-surface-area material of potential interest for supercapacitors and fuel cells.

1,083 citations

Journal ArticleDOI
TL;DR: In this article, an asymmetric supercapacitor (ASC) was fabricated using reduced graphene oxide (RGO) sheets modified with ruthenium oxide (RuO2) or polyaniline (PANi) as the anode and cathode, respectively.
Abstract: An asymmetric supercapacitor (ASC) was fabricated using reduced graphene oxide (RGO) sheets modified with ruthenium oxide (RGO–RuO2) or polyaniline (RGO–PANi) as the anode and cathode, respectively. The ASC exhibited a significantly improved capacitive performance in comparison with that of the symmetric supercapacitors fabricated with RGO–RuO2 or RGO–PANi as the electrodes. The improvement was attributed to the broadened potential window in an aqueous electrolyte, leading to an energy density of 26.3 W h kg−1, about two-times higher than that of the symmetrical supercapacitors based on RGO–RuO2 (12.4 W h kg−1) and RGO–PANi (13.9 W h kg−1) electrodes. In addition, a power density of 49.8 kW kg−1 was obtained at an energy density of 6.8 W h kg−1.

722 citations