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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Galvanostatic charge/discharge curves of SNC700 at current densities from 0.5 to 20 A/g (a); gravimetric specific capacitances at various current densities (inset photo of the supercapacitor lighting up the LED) (b).