A nanocomposite of carbonaceous aerogel (CA) supported by modified MnO 2 nanoparticles with ferrocene (Fc) moiety (MnO 2 -Fc/CA) was prepared by a simple and environmentally friendly approach in two steps. In the first step, a porous carbon-based material was synthesized using watermelon as a starting material. Then, 5-ferrocenylpentanoic acid was covalently grafted onto the α-MnO 2 surface through hydrothermal route, and finally, MnO 2 -Fc/CA was obtained by simply physically mixing MnO 2 -Fc and CA in acetone. After thorough characterization of as-prepared nanomaterial via appropriate analyses, the MnO 2 -Fc/CA nanocomposite reveals excellent electrochemical performances (C s value: 963 F g À1 at 1 A g À1 ) and outstanding cycling stability ($96% after 3000 CV cycles). Moreover, the constructed symmetric cell reveals a high-energy density of 38.1 Wh kg À1 and a high-power density of 4556 W kg À1 . The final high-performance nanocomposite is a very favorable candidate for energy storage applications.
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