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Polypyrrole/MnO 2 composites and their enhanced electrochemical capacitance
Author(s) -
Zhang AiQin,
Xiao YuanHua,
Lu LingZhen,
Wang LiZhen,
Li Feng
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38153
Subject(s) - polypyrrole , materials science , dielectric spectroscopy , fourier transform infrared spectroscopy , scanning electron microscope , transmission electron microscopy , composite number , composite material , capacitance , electrochemistry , chemical engineering , analytical chemistry (journal) , electrode , polymerization , chemistry , nanotechnology , polymer , organic chemistry , engineering
The composites of polypyrrole (PPY) and MnO 2 have been prepared through chemical oxidation of pyrrole monomer and MnO 2 suspension with ammonium peroxysulfate at low temperature. The morphology and structure of materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Transmission electron microscopy (TEM), thermal gravity analysis ‐ differential thermal gravity (TG‐DTG), and X‐ray diffraction (XRD) measurements. The electrochemical properties of the composite were investigated by galvanostatic charge–discharge and electrochemical impedance spectroscopy. The specific capacitance of the composite electrode is 352.8 F/g at a current of 8 mA/cm 2 in Na 2 SO 4 electrolyte of 0.5 mol/L, which is much higher than that of 246.2 F/g and 103.5 F/g of PPY and MnO 2 , respectively. A convenient and effective technique has been developed to fabricate composite materials of PPY and MnO 2 promising for designing new capacitors. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013