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SEM micrographs (a) and (b) of CNT-grafted CNFs; TEM micrographs (c) and (d) of Ni nanoparticles in CNT-grafted CNFs.
(Color online) Schematic of a prototype supercapacitor made of hierarchical electrodes.
(Color online) Cyclic voltammograms of the hierarchical electrodes at varied scanning rates.
(Color online) Potential-time discharge curves.
Dependence of specific capacitance on discharge current density.
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