Open AccessHigh-performance asymmetric supercapacitor based on vanadium dioxide and carbonized iron-polyaniline electrodes
Author(s) -
N. M. Ndiaye,
M.J. Madito,
B.D. Ngom,
Tshifhiwa M. Masikhwa,
Abdulmajid A. Mirghni,
Ncholu Manyala
Publication year - 2019
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.5091799
Subject(s) - polyaniline , supercapacitor , gravimetric analysis , materials science , vanadium , electrolyte , carbonization , cyclic voltammetry , electrode , inorganic chemistry , chemical engineering , electrochemistry , chemistry , polymer , composite material , metallurgy , organic chemistry , scanning electron microscope , engineering , polymerization
Vanadium dioxide (VO2) monoclinic nanosheets were synthesized by a solvothermal method and carbonized iron-polyaniline (C-FP) nanograins were prepared by pyrolysis of iron-polyaniline (PANI) mixture under nitrogen ambient. An asymmetric device (VO2//C-FP) was evaluated with VO2 and C-FP as positive and negative material electrodes in aqueous 6 M KOH electrolyte respectively. The asymmetric supercapacitor (VO2//C-FP) exhibited a 47 mA h g-1 specific capacity and a specific energy of 30 W h kg−1 with an associated specific power of 713 W kg−1 at a gravimetric current of 1 A g−1 in a potential window of 1.6 V. It also displayed an 89% energy efficiency after 10000 galvanostatic charge-discharge cycles with a large improvement after ageing test at a gravimetric current of 10 A g-1.
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