Electrochemical performance of hybrid supercapacitor device based on birnessite-type manganese oxide decorated on uncapped carbon nanotubes and porous activated carbon nanostructures.
Ochai-Ejeh, F. Madito, M.J. Makgopa, K. Rantho, M.N. Olaniyan, O. Manyala, N.
Ochai-Ejeh, F.
Madito, M.J.
Makgopa, K.
Rantho, M.N.
Olaniyan, O.
Manyala, N.
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Abstract
Birnessite-type MnO2 synthesized on the surface of carbon nanotubes (CNTs) via facile hydrothermal reflux technique to produce MnO2-CNT nanocomposite and 3D microporous nanostructured activated carbon (AC) derived from cork (Quercus Suber) with good microstructural, morphological and electrochemical properties are herein reported. A hybrid supercapacitor device comprising of MnO2-CNT nanocomposite as positive electrode and AC as the negative electrode was successfully fabricated and tested for energy storage application. The device displayed a maximum working potential of up to 2 V due to the excellent synergistic contribution from the MnO2-CNT nanocomposite and AC material derived from cork (Quercus Suber). The fabricated device displayed good electrochemical performance having an energy density of ~25Wh Kg1 that corresponds to a power density of 500WKg1 at a current
density of 0.5 A g1 in a 1M Li2SO4 aqueous neutral electrolyte. The device exhibited an excellent stability of ~100% coulombic efficiency after 10,000 charge-discharge cycles and excellent capacitance retention after potentiostatic floating test for 60 h.
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Date
2018-09-04
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Elsevier Ltd.
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Keywords
Birnessite-type MnO2, Activated carbon, Hybrid device, Reflux synthesis, Nanocomposite