Spherical-like ball-by-ball architecture of Ni-Co-Zn-S was obtained through one pot simple and facile hydrothermal method without any surfactant. The as synthesized crystalline powder was characterized by using various tools like powder X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. Furthermore, the electrochemical performance studies were carried out from cyclic-voltammetry (CV), galvanostatic charge–discharge (CD) and electrochemical impedance spectroscopy (EIS), within 3.5 M KOH. The consistent increment of clear redox peaks were obtained from CV characteristics due to synergic activities of Ni, Co and Zn. In addition, the presence of Zn ions into Ni and Co has increased its electronic conductivity; therefore, we could observe the superior performance. Thus, Ni-Co-Zn-S exhibited a maximum specific capacitance of 825, 680, 582, 512, 460, 432, 392 and 328 Fg−1 at 1, 2, 3, 4, 5, 6, 7 and 10 Ag−1 within 3.5 M KOH electrolyte. The obtained results are suggesting the excellent electrochemical activities with affordable rate of Ni-Co-Zn-S which is suitable electrode for device applications. Thus, our results may pave the way for the fabrication of advanced high energy storage device through a low-cost preparation to attain the extraordinary limit in energy device industry. © 2017 The Electrochemical Society. All rights reserved.

Vignesh M

Department of Manufacturing Engineering

School of Mechanical Engineering

Vellore Campus

Navamathavan R

Physics

School of Advanced Sciences

Chennai Campus

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

Journal of The Electrochemical Society

With high power density and promising possibilities for high energy density, the electrochemical capacitor has become an indispensable energy storage device to satisfy the future energy demands. Here in, we report on synthesis of graphene nanosheets (GNS) supported manganese sulfide (MnS) hybrid (GNS-MnS) nanocomposite by a simple, facile hydrothermal process. The resultant GNS-MnS hybrid nanocomposite with robust electronic amalgamation facilitates swift transfer of both ions and electrons across the interface between electrode surface and electrolyte ions than pristine MnS. Benefiting from the better conduction along with improved active sites of the MnS in GNS-MnS hybrid nanocomposite, a high ratio surface/near-surface reactions is dominated by high specific capacity even at high current rate. As such, the GNS-MnS hybrid nanocomposite exhibited a maximum specific capacitance of 792 F g −1 at 2 A g −1 along with better retention rate of 58% at 15 A g −1 , is significantly higher than that of pristine MnS (423 F g −1 at 2 A g −1 and 37% retention at 15 A g −1 ). In addition, the fabricated symmetric GNS-MnS hybrid nanocomposite cell delivered a high energy density of 25 W h kg −1 and power density of 7160 W kg −1 . Moreover, specific capacitance of 91.1% is retained after 15000 th cycles with columbic efficiency of ∼100% at 20 A g −1 . The remarkable electrochemical performance of GNS-MnS hybrid nanocomposite electrode demonstrated its potential as a key material for developing high energy supercapacitors. © 2019 Elsevier B.V.

Materials Chemistry and Physics

Synthesis of GNS-MnS hybrid nanocomposite for enhanced electrochemical energy storage applications

Gallium nitride nanostructures have been receiving considerable attention as building blocks for nanophotonic technologies due to their unique high aspect ratios, promising the realization of photonic and biological nanodevices such as blue light emitting diodes (LEDs), short-wavelength ultraviolet nanolasers, and nanofluidic biochemical sensors. We report on the growth of hierarchical GaN nanowires (NWs) by dynamically adjusting the growth parameters using the pulsed flow metal-organic chemical vapor deposition technique. We carried out two step growth processes to grow hierarchical GaN NWs. In the first step, the GaN NWs were grown at 950°C, and in the second, we suitably decreased the growth temperature to 630°C and 710°C to grow the hierarchical structures. The surface morphology and optical characterization of the grown GaN NWs were studied by field-emission scanning electron microscopy, high-resolution transmission electron microscopy, photoluminescence, and cathodoluminescence measurements. These kinds of hierarchical GaN NWs are promising for allowing flat band quantum structures that are shown to improve the efficiency of LEDs. © 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).

Journal of Photonics for Energy

Growth of hierarchical GaN nanowires for optoelectronic device applications

Nanocomposites of MnS anchored on graphene, nitrogen-doped graphene and boron-doped graphene have been prepared by a simple wet chemical process.

Fulltext

RSC Advances

MnS nanocomposites based on doped graphene: simple synthesis by a wet chemical route and improved electrochemical properties as an electrode material for supercapacitors

Applied Surface Science

High performance symmetric supercapacitor based on zinc hydroxychloride nanosheets and 3D graphene-nickel foam composite

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Copper doped manganese ferrites nanoparticles anchored on graphene nano-sheets for high performance energy storage applications

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Hybrid Material of PANI with TiO2-SnO2: Pseudocapacitor Electrode for Higher Performance Supercapacitors

Spherical-Like Ball-by-Ball Architecture of Ni-Co-Zn-S Electrodes for Electrochemical Energy Storage Application in Supercapacitors

Journal	Journal of The Electrochemical Society
Publisher	The Electrochemical Society
ISSN	0013-4651
Open Access	0