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Polymer Congress 2018 Polymer Sciences
ISSN: 2471-9935 Page 86
June 04-05, 2018
London, UK
4th Edition of International Conference on
Polymer Science and
Technology
Polym Sci 2018, Volume 4
DOI: 10.4172/2471-9935-C2-012
S upercapacitor, which can be divided into electrochemical
double layer supercapacitor (EDLC) and pseudocapacitor,
is an attractive environment-friendly energy supplier. And
composition is a promising way to combine the high power
density of carbon-based EDLC and high energy density
of pseudocapacitors based on conductive polymers or
transition metal oxidant. Among the composites for the use
of supercapacitor electrode, reduced graphite oxide-based
polyaniline composite (PANI/rGO) is cost-efficient, easy to
synthesize and suitable for large-scale manufacture. However,
there are two main obstacles for the development of PANI/
rGO composite. Firstly, commonly used reducers, such as
hydrazine hydrate (HH) and sodium borohydride, are toxic.
Secondly, rGO tend to restack after reduction, resulting in a
non-uniform dispersion inside the PANI. In this study, we used
an environment friendly tannic acid (TA) as reducer, and the
electrochemical properties of PANI/TA-rGO composites were
investigated. Additionally, TA is expected to interact with
rGO and develop the dispersion of rGO, therefore additionally
surface modification or addition of dispersant can be avoided.
X-ray diffraction and Raman spectra indicate that, the reducing
efficiency of TA could be enhanced by extending the reduction
time. Compared with HH, TA presents a less reducing
efficiency, but the rGO-TA shows better dispersion in the water
than the rGO-HH. Therefore, the PANI/rGO-TA composites own
much higher specific surface area and higher rate capability
than the PANI/rGO-HH composite. The specific capacitance
of PANI/rGO composite relies not only on the specific surface
area, but also on the conductivity. PANI/rGO-TA-24h, in which
the rGO was prepared by using TA as reduced for 24 h, shows
the highest specific capacitance in this study. Moreover,
the morphology of PANI could be influenced by the surface
functionality of rGO.
Tannic acid reduced GO and electrochemical properties of PANI/
TA-rGO composite
Xueyan Zhao and Jürgen Pionteck
Leibniz Institute of Polymer Research, Germany