A Flexible Cotton-Based Supercapacitor Electrode with High
Stability Prepared by Multiwalled CNTs/PANI
and DAN YU
1.—College of Chemistry, Chemical Engineering and Biotechnology, Donghua University,
Shanghai 201620, People’s Republic of China. 2.—Key Laboratory of Science and Technology of
Eco-Textile, Ministry of Education, Donghua University, Shanghai 201620, People’s Republic of
China. 3.—e-mail: email@example.com
Multiwalled nanotubes/cotton composite was prepared ﬁrstly as conductive
fabric, and then, polyaniline (PANI) doped with multi-walled carbon nan-
otubes (MWCNTs) were fabricated on the conductive fabric to make ﬂexible
cotton-based supercapacitor electrodes. The doping of MWCNTs cannot only
provide good conductivity and large speciﬁc surface area of the electrode, but
also help to increase the loading of aniline monomer in the polyaniline poly-
merization. Field emission scanning electron microscopy was applied to ob-
serve the surface morphology of the composite, and Fourier transform infrared
and Energy dispersion spectrum were used to analysis the existence of PANI.
Electrochemical tests were adopted to measure the electrochemical perfor-
mance. The results demonstrated the multivariate mixture composite ﬂexible
electrode exhibited a speciﬁc capacitance of 590.93 F g
at a scan rate of
0.001 V s
and an excellent capacitance retention of 89% at 0.1 V s
3000 cycles. Based on our method, the cycle stability of the composite was
great and so was the capacitance retention.
Key words: MWCNTs doping PANI, cotton fabric, ﬂexible supercapacitor
electrode, synergistic effect
Energy is one of the most important signs of
people progress, with the increasing consumption of
fossil fuels, people are searching for new replaceable
Electrical energy and its storage
have sparked a lot of attention, among them,
supercapacitors have drawn much attention due to
the fast charging and discharging rate capacity,
high power density, long life cycle and can be used
to store or supply large surges of energy.
Supercapacitors are mainly divided as the electric
double layer capacitors (EDLCs) and faradaic pseu-
docapacitors charge storage mechanisms.
store electrical energy through the electrostatic
charge absorption and accumulate at the interface
of the electrode and the electrolyte, and generally
are based on carbon materials.
are potential carbon materials, which have huge
speciﬁc areas, excellent conductivity and stability.
There are single-walled nanotubes (SWCNTs) and
(multi-walled nanotubes) MWCNTs, while
MWCNTs are more suitable materials for large
scale applications and low cost.
Pseudocapacitors depend on reversible fast sur-
face faradaic redox reactions, which can result in a
much higher energy density than that of EDLCs. In
the past few years, various faradaic electrode mate-
rials, including metallic oxide and conducting poly-
mer were studied. Polyaniline (PANI) is one of the
conducting polymers, which has good conductivity,
and pseudocapacitive perfor-
while it usually shows poor cycle stabil-
due to the swell and shrink of the structure.
It becomes a major bottleneck for their implemen-
tation in practical applications. To improve the cycle
stability of PANI in the electrode materials, several
reports have made an effort to have a combination of
(Received November 2, 2017; accepted April 18, 2018;
published online May 1, 2018)
Journal of ELECTRONIC MATERIALS, Vol. 47, No. 7, 2018
2018 The Minerals, Metals & Materials Society