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Electropolymerized Polypyrrole Nanocoatings on Carbon Paper for Electrochemical Energy Storage
Author(s) -
Wei Huige,
Wang Yiran,
Guo Jiang,
Yan Xingru,
O'Connor Ryan,
Zhang Xin,
Shen Nancy Z.,
Weeks Brandon L.,
Huang Xiaohua,
Wei Suying,
Guo Zhanhu
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201402258
Subject(s) - polypyrrole , materials science , dielectric spectroscopy , cyclic voltammetry , horizontal scan rate , conductive polymer , electrode , capacitance , electrochemistry , carbon fibers , supercapacitor , energy storage , conductivity , chemical engineering , polymer , electrical conductor , nanotechnology , composite material , chemistry , polymerization , power (physics) , composite number , physics , quantum mechanics , engineering
A highly electrically conductive and uniform polymer film containing small, evenly sized particles was potentiodynamically electropolymerized at a slow scan rate of 50 mV s −1 , as compared to the strongly agglomerated and low‐conducting films obtained at higher scan rates of 100 and 200 mV s −1 . Cyclic voltammetry and galvanostatic charge–discharge experiments demonstrated a higher areal capacitance, energy density, and power density in the former material. The superior supercapacitive performance was studied by electrochemical impedance spectroscopy (EIS) and can be explained by both a higher electrical conductivity and a facilitated charge transfer in the redox reactions occurring in the former electrode. This work suggests the possibility of fabricating polypyrrole (PPy) pseudocapactive electrodes with high performance via a facile potentiodynamic synthesis at low scan rates. Meanwhile, it provides an alternative to introducing surface functionalities of conductive polymers onto the carbon paper.