

FOLLOWUS
The Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, China
Gao-yi Han (韩高义), E-mail:han_gaoyis@sxu.edu.cn
Yao-ming Xiao (肖尧明), E-mail:ymxiao@sxu.edu.cn
Received:12 January 2017,
Revised:2017-3-28,
Accepted:29 March 2017,
Published:2017-08
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Ya-hui Chang, Wen Zhou, Gao-yi Han, et al. Stabilities of Flexible Electrochemical Capacitors Based on Polypyrrole/Carbon Fibers in Different Gel Electrolytes[J]. Chinese Journal of Polymer Science, 2017, 35(8): 961-973.
Ya-hui Chang, Wen Zhou, Gao-yi Han, et al. Stabilities of Flexible Electrochemical Capacitors Based on Polypyrrole/Carbon Fibers in Different Gel Electrolytes[J]. Chinese Journal of Polymer Science, 2017, 35(8): 961-973. DOI: 10.1007/s10118-017-1957-y.
Flexible electrochemical capacitors (ECs) are vitally important as the emerging flexible electronics. We have prepared polypyrrole doped with counter ion of Cl
-
on carbon fibers (PPy-Cl/CFs)
via
the simple electrochemical deposition method. The flexible ECs based on PPy-Cl/CFs electrodes have been assembled by using H
3
PO
4
/poly(vinyl alcohol) (PVA)
H
2
SO
4
/PVA
LiClO
4
/PVA
KCl/PVA and LiCl/PVA as gel electrolytes. The capacitive properties of ECs have been systematically evaluated with electrochemical methods. The results show that the cells with H
3
PO
4
/PVA electrolyte exhibit good cyclic stability (91.5% retention after 15000 cycles) although PPy-Cl/CFs has moderate specific capacitance in H
3
PO
4
/PVA (41.6 mF·cm
-1
or 52.0 F·cm
-3
). However
the ECs in other electrolytes have poor cyclic stability. Further electrochemical analysis reveals that the doping/dedoping processes of PPy-Cl/CFs are different in the five electrolytes
and X-ray photoelectron spectra demonstrate that the ratios of counter anions in PPy's oxidized states to those in reduced states are obviously different when PPy-Cl/CFs are kept in reduced or oxidized states in the five electrolytes. The results also illustrate why the capacitors using H
3
PO
4
/PVA as electrolyte exhibit good cyclic stability. Furthermore
a light emitting diode (LED) with a threshold voltage of 2.5 V can be lighted by three ECs connected in series.
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