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Carbon nanospheres derived from Lablab Purpureus as a high performance supercapacitor electrode: Green approach†

Abstract

Carbon nanospheres derived from natural source using a green approach were reported. Lablab Purpureus seeds were pyrolyzed at different temperatures, to produce carbon nanospheres for supercapacitor electrode materials. The synthesized carbon nanospheres were analyzed using SEM, TEM, FTIR, TGA, Raman Spectroscopy, BET and XRD. They were later fabricated into electrodes for cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy testings. The specific capacitances were found to be 300, 265 and 175 F g-1 in 5 M KOH electrolyte for carbon nanospheres synthesized at 800, 700 and 500 oC, respectively. These are at par with prior electrodes made of biologically derived carbon nanospheres but the cycles life were remarkably higher than any previous efforts. The electrodes showed 94% capacitance retention even after 5200 charge/discharge cycles entailing excellent recycling durability. In addition, the practical symmetrical supercapacitor showed a good electrochemical behaviour under potentials window up to 1.7 V. This brings us one step closer to fabricating a commercially green electrode which exhibits high performance for supercapacitors. This is also a waste to wealth approach based carbon materials for cost effective supercapacitors with high performance for power storage devices.

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Publication details

The article was received on 03 Jul 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02392H
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Carbon nanospheres derived from Lablab Purpureus as a high performance supercapacitor electrode: Green approach†

    G. A. M. Ali, D. Aravind, S. S, K. F. Chong, A. Ethiraj, M.V Reddy, H. Gharni and G. Hegde, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02392H

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