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Ethylenediamine Assisted Growth of Multi-Dimensional ZnS Nanostructures and Study of its Charge Transfer Mechanism on Supercapacitor Electrode and Photocatalytic Performance.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Ethylenediamine Assisted Growth of Multi-Dimensional ZnS Nanostructures and Study of its Charge Transfer Mechanism on Supercapacitor Electrode and Photocatalytic Performance."

In recent years, much interest have been grabbed by materials with multi-purpose characteristics. As the performance of electrochemical energy device such as supercapacitors and photocatalytic activities depend strongly on the properties of materials. This study delineates the various parameters like morphology, energy bandgap, charge transfer resistance, different defect states, diffusion coefficient, functional groups adsorbed on the surface of material etc. to assess the performance of supercapacitor electrode and photocatalyic degradation efficiency of synthesised multi-dimensional ZnS nanostructures. Ethylenediamine mediated multi-dimensional ZnS nanostructures were grown by the Solvothermal route. 1D (one-dimensional), 2D (two-dimensional) and 3D(three-dimensional) morphologies were obtained by varying the ratio of de-ionised water(DI) and Ethylenediamine (EN) taken as 1:3,1:2 and 1:1 respectively. The EN molecules effectively cap most of the surfaces of the ZnS nanoparticles formed, preventing agglomeration of nanoparticles due to decrement in surface energy. The oriented attachment of these clusters resulting in the formation of 1D, 2D and 3D morphologies. The plausible chemistry for the formation of 1D, 2D and 3D nanostructures have been elaborated. Charge transfer properties of prepared electrodes have been examined using Electrochemical Impedance Spectroscopy (EIS) technique because better charge transfer caused to diminishing electron/hole recombination and hence better photo degradation efficiency. Among the synthesised materials, 2D nanostructure degrades the Eosin Y dye to maximum 90.71% efficiency with rate constant 34×10-3min-1. 2D nanostructures possess better charge transfer and hence better photo degradation efficiency. Various studies like UV-Vis, FT-IR(Fourier transform Infrared),BET(Brunnauer-Emmett-Teller),XPS(X-ray photoelectron spectroscopy), PL(Photoluminescence) spectra are in good agreement with the obtained photo degradation results. After analysing data of Cyclic Voltammetry (CV) curves and Electrochemical Impedance Spectra(EIS), higher diffusion coefficient is obtained for 1D nanostructure material, hence higher specific capacitance and higher energy density of 159.12 F/g and 22.75 KWh/kg are found in this case. Only 9 % loss of specific capacitance is achieved after 1000 cycles, showing a relatively high cycling stability in 3-D nanostructures. The excellent super capacitive property can be attributed to the porous structure and high specific surface area. Thus, the synthesised multi-dimensional ZnS nanostructures are proved to be potential candidate for both photocatalytic and supercapacitor electrode performance.

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This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528
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