Electrochemical supercapacitor studies of hierarchical structured Co2+-substituted SnO2 nanoparticles by a hydrothermal method |
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| Authors: | K. Karthikeyan S. Amaresh D. Kalpana R. Kalai Selvan Y.S. Lee |
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| Affiliation: | 1. Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea;2. Central Electrochemical Research Institute, Karaikudi 630 006, India;3. Solid State Ionics and Energy Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore 641 046, India |
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| Abstract: | Hierarchical structured Co-doped SnO2 nanoparticles are prepared by a low temperature hydrothermal process. The structural and surface morphologies of the SnO2 and Sn1?xCoxO2 nanoparticles are studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The Sn1?xCoxO2 nanoparticles form with a tetragonal rutile structure during the hydrothermal process without further calcination. The pseudocapacitance behavior of the Sn1?xCoxO2 nanoparticles is characterized by cyclic voltammetry (CV) in 1.0 M H2SO4 electrolyte. The specific capacitance (SC) is found to increase with an increase in cobalt content. A maximum SC of 840 F g?1 is obtained for a Sn0.96Co0.04O2 composite at a 10 mV s?1 scan rate. |
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