Exploring the effect of magnesium oxide on electrochemical properties of polypyrrole encapsulated on graphitic carbon nitride for supercapacitors applications
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Date
2025
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Abstract
This study addresses the facile synthesis of magnesium oxide/graphitic carbon nitride/Polpyrrole (MGP) com
posites by varying the concentration of magnesium oxide. These composites were synthesized via calcination
route followed by in-situ polymerization reaction thus naming the composites as MGP0.5, MGP1, MGP2 and
MGP3. The structural analysis of composites is done through X-ray diffraction (XRD), Fourier Transform Infrared
Spectroscopy (FTIR) and Raman spectroscopy while the morphology is analyzed through Field Emission Scan
ning Electron Microscopy (FESEM) and supported by Transmission Electron Microscopy (TEM). The MGP2
composite, assessed through multi-point BET theory, exhibits a specific surface area of 109.45 m
2
g
1
, surpassing
that of its precursor materials. This enhanced surface area facilitates a greater number of active sites for the
adsorption-desorption of ions. The assessment of electrochemical properties is done through cyclic voltammetry
(CV), galvanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS) in three-electrode
setup in 1 M H
1
2
SO
4
which delivers a specific capacitance of 1132.12 F g
1
at 5 mV s
for MGP2 composite. The
practical applicability of the electrode material was examined by fabricating an asymmetric supercapacitor
device which delivers an energy density of 9.25 W h kg
1
at a power density of 302.72 W kg
1
. The super
capacitor device exhibited 94.03 % capacitance retention after 10,000 cycles demonstrating its potential to be
used as a future supercapacitor applications