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. 2016 Mar 11;7:10987. doi: 10.1038/ncomms10987

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(a) Schematic diagram of the operation circuit; (b,c) the V–Q plots of the direct and the designed charging cycle for the TENG. The shaded areas represent the energy stored per cycle for both cycles. The power required by units in dashed frame in a is satisfied by that supplied by TENG through the designed cycle. The inset pictures show the calculator's display screen as charged by the direct and designed charging cycles, respectively.