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Morphology controlled synthesis of MnCO3-RGO materials and their supercacitor applications

Abstract

MnCO3-reduced graphene oxide (MnCO3-RGO) was grown on the nickle foam by a facile successive ionic layer adsorption and reaction (SILAR) method and used as supercapacitor electrode. The morphology of the MnCO3 functionalities were tuned from lotus to flake to spherical shape using different chelating agents during synthesis. The length and width of the individual petals of the lotus structure MnCO3 were found to be ~200-300 and 50-100 nm, respectively. The reduction of graphene oxide (GO) in MnCO3-RGO composites were confirmed by Raman spectroscopy and electrical conductivity data analysis. The lotus shaped MnCO3 grown on the RGO sheets provided high surface area and electrical conductivity as compared to the developed electrode materials. The cyclic voltammetry, galvanostatic charge-discharege (GCD) and electrochemical impedance spetroscppy analysis showed that the lotus shaped MnCO3 grown on the RGO sheets provided higher current response, large specific capactnace (SC) and low solution, charge-transfer and Warburg resistance as compared to the flake and spherically shaped MnCO3 grown on the RGO sheets. The fabricated asymmetric supercapacitor (ASC) device with MnCO3(lotus)-RGO as positive and sonochemically reduced GO as negative electrode exhibited an working potential of ~0-1.6 V, SC ~ 335 F g-1 at ~2 A g-1 (~468 mF cm-2 at ~2.8 mA cm-2), energy density of ~120 W h kg-1 (~0.16 mW h cm-2) and power density of ~16 kW kg-1 (~22 mW cm-2) with GCD stabiliy of ~73% after 10,000 cycles.

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Publication details

The article was received on 27 Mar 2017, accepted on 12 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7TA02652H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Morphology controlled synthesis of MnCO3-RGO materials and their supercacitor applications

    M. Jana, P. Samanta, N. C. Murmu and T. Kuila, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02652H

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