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Flexible, all-solid-state cells based on Mn/PPy hollow nanoparticle electrodes. (a) Pictorial representation of an all-solid-state flexible electrochemical capacitor cell; (b) typical galvanostatic charge/discharge curves of metal/PPy hollow nanoparticles measured at a current density of 0.1 A·g−1; (c) specific capacitances measured at different current densities; and (d) calculated coulombic efficiencies. Reprinted with permission from [67]. Copyright 2015, Nature Publishing Group.
