The demand for energy
storage supercapacitor devices has increased
interest in completing all innovative technologies and renewable energy
requirements. Here, we report a simple method of two polyoxomolybdate
(H
4
[PVMo
11
O
40
] and H
5
[PV
2
Mo
10
O
40
]) doped polyindole (PIn) composites
for electrochemical supercapacitors. The interactions between polyoxomolybdates
and PIn were measured by Fourier transform infrared spectroscopy (FTIR),
and powder XRD, and stability was measured by thermogravimetry. The
field emission scanning microscopy (FESEM) was employed to investigate
the morphology of the materials. The electrochemical measurements
show that the PIn/PV
2
Mo
10
electrode exhibits
a higher capacitance of 198.09 F/g with an energy density of 10.19
Wh/kg and a power density of 198.54 W/kg at 0.2 A/g current density
than the PIn/PVMo
11
electrode. Both electrodes show a pseudocapacitance
behavior due to the doping of redox-active polyoxomolybdates on the
PIn surface and enhance the electrochemical properties. The electrodes’
capacitive nature was measured by electrochemical impedance spectroscopy
(EIS), which shows that the PIn/PVMo
11
electrode has a
resistive nature within the electrode–electrode interface.
Moreover, the PIn/PV
2
Mo
10
electrode offers remarkable
cycle stability, retaining ∼84% of its capacitance after 10,000
cycles (∼83% for the PIn/PVMo
11
electrode). The
higher specific capacitance, faster charge/discharge rates, and higher
cycle stability make them promising electrodes in supercapacitors.
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