Abstract
Fabrication and characterization of high energy density supercapacitor based on graphite oxide/polypyrrole (GO/PPy) composites is reported. Improvement in charge storage has been obtained by exfoliation of graphite oxide sheets via intercalation of polypyrrole. The formation of composite has been shown by the analysis of X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and Fourier transfer of infrared spectroscopy data. Scanning electron and transmission electron microscopy clearly show sheet-like layered structure of graphite oxide surrounded by polypyrrole. Supercapacitors fabricated using this composite system result in a reduced equivalent series resistance value ~1.85 Ω. Such low value can be attributed to the intercalation of conducting polypyrrole into the graphite sheets. A specific capacitance of ~181 F g−1 in 1 M Na2SO4 aqueous electrolyte with a corresponding specific energy density of ~56.5 Wh kg−1 could be achieved. These values make GO-based materials suitable for their use as electrodes in high performance supercapacitors.
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Acknowledgments
Arvinder Singh would like to thank CSIR (India) for the award of Junior Research Fellowship. Authors also acknowledge the FIST program of DST (India) for sanctioning funds for XPS instrument. We also would like to thank Prof. S. A. Hashmi, Department of Physics and Astrophysics, University of Delhi, Delhi for providing facilities to perform electrochemical measurements.
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Singh, A., Chandra, A. Graphite oxide/polypyrrole composite electrodes for achieving high energy density supercapacitors. J Appl Electrochem 43, 773–782 (2013). https://doi.org/10.1007/s10800-013-0573-y
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DOI: https://doi.org/10.1007/s10800-013-0573-y