Nanocomposites of Co3S4 grown on nitrogen-doped graphene (NG) (Co3S4-NG) have been prepared at various concentrations of NG. The supercapacitive behaviors of the developed nanocomposites were assessed with cyclic voltammetry and galvanostatic charge discharge techniques. The nanocomposites exhibit excellent capacitive behavior with a high specific capacitance of 2427F/g at 2mV/s in Co3S4-NG-7 composite (7 indicates the percentage weight ratio of NG). The superior electrochemical performances could be due to synergistic effects between Co3S4 and NG, high charge mobility and good flexibility of graphene structures. These results indicate that the developed hybrid materials are promising candidates for high performance energy applications. © 2014 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim.

Nirmala Grace A

Centre for Nanotechnology Research

Vellore Campus

Ramachandran R

Vinoba M

Choi S.Y

Chu D.H

Yoon Y

Nam S.C

Jeong S.K.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Electroanalysis

MXenes, a new family of 2-dimensional materials extends its potential in various applications. The present work reports a detailed study on the synthesis, properties and electrochemical performance of Vanadium carbide (V4C3) MXene as a supercapacitor electrode. The Vanadium carbide MXene was synthesised by etching intermediate “A-Aluminium” layer form the parental MAX phase precursor vanadium aluminium carbide using HF etching. The synthesised MXene materials were characterized by X-ray powder diffraction (XRD) for phase identification and structural confirmation; FE-SEM and TEM for the morphological analysis. TGA was employed to understand the thermal behaviour and stability of the sample. The results revealed that the synthesised samples are in layered structure. XRD shows a shift in peaks attributing to the aluminium etching processes which was also supported by TEM as increase in the d-spacing. Furthermore, the MXene electrodes were prepared and tested for its electrochemical behaviour towards supercapacitor electrodes by using techniques like cyclic voltammetry, chrono potentiometry, and electrochemical impedance spectroscopy proving as a potential electrode material for electrochemical energy storage application. © 2019 Elsevier Ltd and Techna Group S.r.l.

Ceramics International

Synthesis, properties and performance evaluation of vanadium carbide MXene as supercapacitor electrodes

With every moving day, the aspect that is going to be the most important for modern science and technology is the means to supply sufficient energy for all the scientific applications. As the resource of fossil fuel is draining out fast, an alternative is always required to satisfy the needs of the future world. Limited resources also force to innovate something that can utilise the resource more efficiently. This work is based on a simple synthesis route of biomass derived hard carbon and to exploring the possibility of using it as electrochemical supercapacitors. A cheap, eco-friendly and easily synthesized carbon material is utilized as electrode for electrochemical energy-storage. Four different hard carbons were synthesized from KOH activated banana stem (KHC), phosphoric acid treated banana stem derived carbons (PHC), corn-cob derived hard carbon (CHC) and potato starch derived hard carbons (SHC) and tested as supercapacitor electrodes. KOH-activated hard carbon has provided 479.23 F/g specific capacitance as calculated from its cycle voltammograms. A detailed analysis is done to correlate the results obtained with the material property. Overall, this work provides an in depth analysis of the science behind the components of an electrochemical energy-storage system as well as why the different characterization techniques are required to assess the quality and reliability of the material for electrochemical supercapacitor applications. © 2019, The Author(s).

Fulltext

Scientific Reports

Natural biomass derived hard carbon and activated carbons as electrochemical supercapacitor electrodes

A series of vanadium pentoxide (V2O5/G) nanocomposites with graphene and doped graphene was synthesized by a facile solvothermal route and the supercapacitor performance of the obtained materials were further examined. The various heteroatom doped graphene composites viz. B doped (V2O5/BG), N doped (V2O5/NG) and BN codoped graphene (V2O5/BNG) was analyzed systematically to understand the effect of the dopants and their electrochemical properties. The structural and morphology of the obtained nanocomposites were investigated by using X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Thermogravimetric Analysis (TGA), Transmission Electron Microscope (TEM) and Brunauer, Emmett and Teller (BET). The results showed that the prepared V2O5 nanoparticles are deposited uniformly on graphene sheets. The electrochemical behavior of the nanocomposites were further analyzed to understand its supercapacitance properties in KOH electrolyte. A maximum specific capacitance of 1032.6 F/g was observed for V2O5/NG at 1 mVs-1 scan rate. Galvanostatic charge/discharge curves showed an excellent cyclic stability with higher charge/discharge duration with an energy density of 185.86 Wh/Kg and a power density of 37.20 W/Kg respectively for V2O5/NG nanocomposite. The graphene moieties provide fast and smooth electron transfer between V2O5 materials, thus leading to higher electrode performance compared with V2O5. The doping of heteroatom on graphene has been proven to be an effective way to tailor the properties of graphene and render its potential use for supercapacitor electrodes. © 2018 Elsevier Ltd

Electrochimica Acta

Heteroatom doped graphene based hybrid electrode materials for supercapacitor applications

A series of SnS/Graphene (SnS/G) nanocomposites at various concentrations of graphene were synthesized by a wet chemical route and the prepared composites were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), High Resolution Transmission Electron Microscopy (HRTEM) for its structural and morphological investigation. Results show that the prepared SnS nanoparticles in the composite are [Formula: see text]30[Formula: see text]nm sized and uniformly dispersed on graphene sheets. To test the supercapacitance behavior, electrochemical measurements were carried out in 6[Formula: see text]M KOH electrolyte. A maximum specific capacitance of 984[Formula: see text]F/g was observed for SnS/G-c at 5[Formula: see text]mVs[Formula: see text] scan rate. Galvanostatic charge/discharge curves showed an excellent cyclic stability with higher charge/discharge duration, and hence could be used for high performance supercapacitor applications.

International Journal of Nanoscience

Wet Chemical Synthesis of SnS/Graphene Nanocomposites for High Performance Supercapacitor Electrodes

Zinc sulfide decorated graphene nanocomposites are synthesized by a facile solvothermal approach and the prepared composites are analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), High Resolution Transmission electron microscopy (HRTEM), Fourier transform infrared (FTIR), Ultraviolet visible spectroscopy (UV), Photoluminescence spectroscopy (PL) and Raman spectrum. Results show the effective reduction of graphene oxide (GO) to graphene and decoration of ZnS nanoparticles on graphene sheets. Towards supercapacitor applications, the electrochemical measurements of different electrodes are performed in 6 M KOH electrolyte. A series of composites with different loadings of graphene is synthesized and tested for its electrochemical properties. The specific capacitance of the electrodes are evaluated from cyclic voltammetry (CV) studies and a maximum specific capacitance of 197.1 F/g is achieved in ZnS/G-60 electrode (60 indicates the weight ratio of GO) at scan rate of 5 mV s-1. A capacitance retention of about 94.1% is observed even after 1000 cycles for ZnS/G-60 electrode, suggesting the long time cyclic stability of the composite electrode. Galvanostatic charge-discharge curves show the highly reversible process of ZnS/G-60 electrode. Electrochemical Impedance Spectrum (EIS) shows a high conductivity of composite electrode suggesting that the composites are good candidates for energy storage. © 2015 Elsevier Ltd.

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

ECS Transactions

Novel Non-Precious Metal Electrocatalysts for Oxygen Reduction Based on Nanostructured Cobalt Chalcogenide

ACS Applied Materials & Interfaces

Facile Synthesis of Nitrogen-Doped Graphene–Ultrathin MnO2 Sheet Composites and Their Electrochemical Performances

Carbon

Graphene-wrapped polyaniline nanofibers as electrode materials for organic supercapacitors

Ionics

Preparation of Co3O4 nanoplate/graphene sheet composites and their synergistic electrochemical performance

ACS Nano

Freestanding Three-Dimensional Graphene/MnO2 Composite Networks As Ultralight and Flexible Supercapacitor Electrodes

Facile Synthesis and Electrochemical Properties of Co3S4-Nitrogen-Doped Graphene Nanocomposites for Supercapacitor Applications

Journal	Data powered by TypesetElectroanalysis
Publisher	Data powered by TypesetWiley
ISSN	1040-0397
Open Access	0