ZnIn2S4 is an important mixed metal sulfide semiconductor with multifunctional properties, endowed upon by its hierarchical structure, large surface area and porosity. In this work, hierarchical ZnIn2S4.1 (ZnInS) microflowers made up of petal like nanostructures are synthesized using a simple and facile hydrothermal method. Nitrogen adsorption-desorption analysis of these microflowers showed porous structures with pores ~3 nm. This material shows a photocurrent density of 3.1 μA cm−2 and activity towards methylene blue (MB) dye degradation under direct sunlight. The sample also shows pseudocapacitive behavior with specific capacitance value of 131 F g−1 at a scan rate of 10 mV s−1. The pseudocapacitive behavior of polycrystalline ZnInS has been explored for the first time to the best of our knowledge. This study demonstrates that the single phase ZnInS is a multifunctional material for photocatalysis and electrochemical charge storage applications. © 2019 International Solar Energy Society

Gangavarapu Ranga Rao

Department Of Chemistry

Malaya K. Sahoo

Aromatic compounds

Gas adsorption

Photocurrents

Porosity

Semiconducting zinc compounds

Charge storage

HIERARCHICAL MICROFLOWER

Hydrothermal

Methylene blue

PHOTOCATALYTIC DYE DEGRADATIONS

SULFUR COMPOUNDS

Adsorption

catalysis

catalyst

Degradation

Desorption

electrochemical method

flower

Hydrothermal system

inorganic compound

pollutant removal

polymer

surface area

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Solar Energy

The large internal surface areas and outstanding electrical and mechanical properties of graphene have prompted to blend graphene with NiCo2O4 to fabricate nanostructured NiCo2O4/graphene composites for supercapacitor applications. The use of graphene as blending with NiCo2O4 enhances the specific capacitance and rate capability and improves the cyclic performance when compared to the pristine NiCo2O4 material. Here, we synthesized two different nanostructured morphologies of NiCo2O4 on graphene sheets by solvothermal method. It has been suggested that the morphologies of oxides are greatly influenced by dielectric constant, thermal conductivity, and viscosity of solvents employed during the synthesis. In order to test this concept, we have synthesized nanostructured NiCo2O4 on graphene sheets by facile solvothermal method using N-methyl pyrrolidone and N,N-dimethylformamide solvents with water. We find that mixture of N-methyl pyrrolidone and water solvent favored the formation of nanonet-like NiCo2O4/graphene (NiCoO-net) whereas mixture of N,N-dimethylformamide and water solvent produced microsphere-like NiCo2O4/graphene (NiCoO-sphere). Electrochemical pseudocapacitance behavior of the two NiCo2O4/graphene electrode materials was studied by cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy techniques. The supercapacitance measurements on NiCoO-net and NiCoO-sphere electrodes showed specific capacitance values of 1060 and 855 F g−1, respectively, at the current density of 1.5 A g−1. The capacitance retention of NiCoO-net electrode is 93 % while that of NiCoO-sphere electrode is 77 % after long-term 5000 charge-discharge cycles at high current density of 10 A g−1. © 2015, Springer-Verlag Berlin Heidelberg.

Journal of Solid State Electrochemistry

Effect of solvents on the morphology of NiCo2O4/graphene nanostructures for electrochemical pseudocapacitor application

Ultralayered Co3O4 structures with high porosity have been synthesized by a facile homogeneous precipitation process under hydrothermal conditions. The superstructures consist of well-arranged micrometer length rectangular 2D flakes with high specific surface area, pore volume, and uniform pore size distribution. The electrochemical measurements demonstrate that charge storage occurs in ultralayered Co3O4 due to reversible redox reactions. The charge-discharge study shows that the material is capable of delivering very high specific capacitance of 548 F g-1 at a current density of 8 A g-1 and retains 66% of capacitance at 32 A g-1. The charge-discharge stability measurements show excellent specific capacitance retention capability, ca. 98.5% after 2000 continuous charge-discharge cycles at high current density of 16 A g-1. The exceptional cyclic, structural, and electrochemical stability at higher current rate with ∼100% Coulombic efficiency, and very low ESR value from impedance measurements promise good utility value of ultralayered Co3O 4 material in fabricating a wide range of high-performance electrochemical supercapacitors. © 2011 American Chemical Society.

Journal of Physical Chemistry C

Ultralayered Co3O4 for high-performance supercapacitor applications

Sphere-like CoS nanostructures are synthesized in water/ethylene glycol mixed solvents by simple hydrothermal technique using l-cysteine amino acid as a source of sulfur. The results obtained by BET and BJH methods reveal that the CoS has mesoporous bimodal pore distribution in the range of 2-23 nm with a dominant peak around 12.4 nm and a small peak at 2.4 nm. The electrochemical experiments demonstrate that CoS has a high-rate capability for capacitor applications. The reduction of the specific capacitance is very marginal by about 13% of the available capacitance of 363 F g-1 when the scan rate is increased by 10 times. Even at very high frequency of 10 Hz, it retains the specific capacitance value of 150 F g-1, which confirms its higher power capability. Furthermore, during the cycling process, the Coulombic efficiency is better than 90% demonstrating excellent reversibility of CoS electrode. © 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu.

International Journal of Hydrogen Energy

CoS spheres for high-rate electrochemical capacitive energy storage application

Journal of Environmental Chemical Engineering

Interfacial engineering of Fe2O3@BOC heterojunction for efficient detoxification of toxic metal and dye under visible light illumination

Nanoscale Research Letters

One-Pot Synthesis of Cu2ZnSnSe4 Nanoplates and their Visible-Light-Driven Photocatalytic Activity

Multifunctional hierarchical ZnIn2S4±δ microflowers with photocatalytic and pseudocapacitive behavior

Journal	Data powered by TypesetSolar Energy
Publisher	Data powered by TypesetElsevier Ltd
ISSN	0038092X
Open Access	No