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. 2017 Jan 11;7:40163. doi: 10.1038/srep40163

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(a) Cyclic voltammetry curves at 20 mV/s and (b) galvanostatic charge/discharge curves at 0.5 A/g for both a single SC and three NP-GH SCs connected in series. (c,d) Photographs of a red LED connected to the tandem device (c) before and (d) after turn on.