Abstract
Granular type polyaniline (PANi), PANi nanofibers (NFs), and PANi nanotubes (NTs) expedient as working electrode materials for supercapacitors are synthesized. The synthesis procedure used in this work facilitates not only the synthesis of solid powders of the PANi nanostructures, but also thin films constituted by the same PANi nanostructures in the same experiment. PANi NFs are found to exhibit faster electrode kinetics and better capacitance when compared to PANi NTs and granular PANi. Specific capacitance and energy storage per unit mass of PANi NFs are 239.47 Fg−1 (at 0.5 Ag−1) and 43.2 Wh kg−1, respectively. Electrical conductivity of PANi NFs is also better when compared to the other two nanostructures. Properties of the three PANi nanostructures are explicated in correlation with crystallinity, intrinsic oxidation state, doping degree, BET surface area, and ordered mesoporosity pertaining to the nanostructures.
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Acknowledgements
Special thanks are due to Dr. Neha (ARCI, Hyderabad) for helping us with XPS measurements. The authors also thank Mr. M. Durga Prasad, Center for Nanotechnology (University of Hyderabad), for helping us with TEM. GVR extends his gratitude to CSIR, India, for providing financial support through senior research fellowship. VVSSS thanks UGC, India, for its financial support through major research scheme vide Letter No. F. 41-993/2012 (SR). The authors sincerely thank Ms. Sailaja Sankisa for proofreading this article. Scientific discussions with Dr. P.K. Jain (ARCI, Hyderabad) have been very helpful.
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Gedela, V.R., Srikanth, V.V.S.S. Polyaniline nanostructures expedient as working electrode materials in supercapacitors. Appl. Phys. A 115, 189–197 (2014). https://doi.org/10.1007/s00339-013-7920-z
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DOI: https://doi.org/10.1007/s00339-013-7920-z