| Popis: |
A stable and unique porous SnO2/polypyrrole composite has been successfully manufactured using various SnO2 loadings (5, 8, 10, 15 and 20 wt%) by applying a direct polymerization approach and employing a cheap oxidizing agent (FeCl3). The physicochemical properties of the new composites were investigated using X-ray Diffractometer (XRD), Fourier Transform Infra-Red spectrometer (FTIR), Field Emission Scanning Electron Microscope (FESEM) and UV-Visible spectrometer. The estimated band gap energy (Eg) for SnO2/PPy composite revealed lower value ∼ 1.1 eV than pure PPy suggesting good electronic conductivity. Optimization of the polymerization parameters indicated that the prepared SnO2/PPy composite at 0˚C with mass ratio 0.1 exhibited the highest specific capacitance ∼ 450 F.g−1 at 20 mV.S−1 with a significant improvement ∼ 56% with respect to the pure PPy. The optimized SnO2/PPy electrode material revealed an excellent cyclability with constant loss in the capacitance retention ∼ 5% from 500 to 1100 charge/discharge cycles till reach 94% capacitance retention after 1500 cycles. On the other hand, pure PPy displayed a continuous decrease in the capacitance retention approaching 75% after1500 cycles. |
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