Abstract
In the present work, multiwall carbon nanotubes (CNTs) were used as a reducing agent for the preparation of CNT-MnO2 nanocomposites by varying the amount of potassium permanganate (KMnO4). The chemical compositions of the as-synthesized materials were analyzed using X-ray diffraction, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, which showed the formation of MnO2 in the CNT-MnO2 nanocomposites. The electrochemical properties of the CNT-MnO2 nanocomposites were thoroughly investigated through cyclic voltammetry, charge–discharge, and impedance studies. The CNT-MnO2-25 nanocomposites appeared with the highest specific capacitance of 674Fg−1 at a current density of 2Ag−1; they also displayed an excellent capacitance retention of ∼110% even after the completion of 5000 continuous charge–discharge cycles at 10Ag−1.
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