Template-free synthesis of MnO2 nanowires with secondary flower like structure: Characterization and supercapacitor behavior studies |
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Authors: | Taher Yousefi Ahmad Nozad Golikand Mohammad Hossein MashhadizadehMustafa Aghazadeh |
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Institution: | a Department of Chemistry, Tarbiat Moalem University, P.O. Box 13145-185, Tehran, Iran b Materials Research School, NSTRI, P.O. Box 14395-836, Tehran, Iran |
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Abstract: | Manganese dioxide (MnO2) nanowires with diameter about 30-70 nm is achieved via a two-step process: first, template-free cathodic electrodeposition from aqueous solution of Mn(NO3)2 on steel substrate and followed by heat treatment. The temperature-annealed sample was studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) methods and Fourier transform infrared (FT-IR) spectroscopy. The electrochemical performance of the MnO2 sample was studied by cyclic voltammetry (CV) and chronopotentiometry in Na2SO4 solutions. The sample showed excellent supercapacitive behavior. The specific capacitance (SC) of 237 F g−1 in a potential window of 0-0.9V was obtained at the scan rate of 2 mV s−1. The SC calculated from the chronopotentiometry data is about 246 F g−1. The SC was decreased by 16% after 1000 cycles. |
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Keywords: | Manganese oxide Nanowire Supercapacitor Cathodic electrodeposition Specific capacitance |
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