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A facile approach to synthesize a hybrid polymeric composite with ultra-high volumetric capacitance by incorporating waste coconut shell derived activated carbon (AC) and rare-earth metal oxide (Eu2O3) into the polypyrrole (PPY) matrix has been reported in this work. The composite is synthesized via in situ oxidative polymerization. The PPY/AC/Eu2O3 composite stores energy both Faradaically and electrostatically...
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