Synthesis of Lanthanum Oxide Doped Polyaniline Nanocomposites for Supercapacitor Appliacations
Date
Authors
Journal Title
Journal ISSN
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Department of Chemestry
Abstract
Lanthanum oxide was prepared by the precipitation method using EDTA
solution with the La(NO
3
)
3
.6H
2
O in acidic medium in presence of 10% oxalic
acid at pH of 3-4. The formation of La
viii
2
O
3
was confirmed by the XRD. The
size calculation of La
2
O
3
from the XRD data
shows the size of 19.17 nm. The
Different proportions of prepared La
2
O
3
(0.1, 0.2, 0.3, 0.5 g) was doped with
double distilled aniline to form PANI-La
2
O
3
composite by the in situ aqueous
oxidative chemical polymerization method in 1 M H
2
SO
4
solution at the room
temperature. The prepared composite was mixed with little carbon black and
little PVDF and fed into the nickel form and then dried. These electrodes were
subjected to measure various electro chemical behaviors like cyclic
voltammetry and galvanic charge discharge curves. CV for the samples was
taken with the scan rate of 10 mV/s. The Galvano static charge discharge
cycle of samples were taken at a current of 4 Ag
-1
in three electrode system
between the potential ranges of -0.2 to 1 V. From both specific capacitances of
the electrodes was studied. The specific capacitance for the sample (S
2
) 0.2 gm
La
2
O
3
doped in PANI in 1 M H
2
SO
4
has highest values of 206 Fg
-1
that was
obtained from CV. The same sample also showed the highest specific
capacitance of 210 Fg
-1
in galvanic charge discharge cycle. From these we can
conclude that the sample (S
2
) 0.2 gm La
2
O
3
doped in PANI in 1 M H
2
SO
4
will
be the best among these samples for the supercapacitor applications.