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. 2019 Feb 4;9:1129. doi: 10.1038/s41598-018-37369-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Nyquist curves for all prepared samples as electrodes in 6 M KOH, (b) Nyquist curve of 4NG sample (inset shows its equivalent circuit), (c) Bode plots of all prepared samples supercapacitor devises, (d) The cycling stability of sample 4NG supercapacitor and sample 6 G, during 5000 charge/discharge cycles, measured at a current density 4 A g⁻¹ within the potential range from 0 to 1.1 V, with the first 10 charge/discharge cycles for sample 4NG, (e) Photograph and (f) Schematic illustration of a stacking three-unit cell used to power a red LED.