Polyoxometalate/α-Fe2O3/polyaniline composite: Tailored approaches for high-performance supercapacitors

Polyoxometalate/α-Fe2O3/polyaniline composite: Tailored approaches for high-performance supercapacitors

The need for portable, high-performance electronics that have high power or energy density has increased significantly in recent years. In this work, a composite material was coated on stainless steel that consists of polyoxometalate (POM)/α-Fe2O3/polyaniline (PANI) as an electrode material for a sy...

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Bibliographic Details
Published in:Journal of alloys and compounds Vol. 1010; p. 177306
Main Authors: Pujari, Sheejal, Desai, Nakul, Y.N., Sudhakar, Waikard, Maqsood R., Sonkawade, Rajendra G., M., Nidhin, Nazareth, Ronald Aquin
Format: Journal Article
Language:English
Published: Elsevier B.V 05-01-2025
Subjects:
Polyaniline
Polyoxometalate
Supercapacitor
α-Fe2O3
Polyoxometalate
α-Fe2O3
Supercapacitor
Polyaniline
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Summary:The need for portable, high-performance electronics that have high power or energy density has increased significantly in recent years. In this work, a composite material was coated on stainless steel that consists of polyoxometalate (POM)/α-Fe2O3/polyaniline (PANI) as an electrode material for a symmetric supercapacitor. α-Fe2O3 was prepared using starch as a template while PANI was electrodeposited. The physical and chemical characteristics of the modified electrodes were investigated via Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and electrochemical techniques such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic chargedischarge (GCD) experiments. In 1 M H2SO4, the composite had a specific capacitance of 528 F/g at a current density of 0.2 A/g. In addition, the composite exhibited a high energy density of 73.4 Wh kg−1 at a high-power density of 7.14 kW kg−1 and 91.62 % capacity retention after 10 cycles. The results show that POM/α-Fe2O3/PANI is a promising composite electrode for use as a supercapacitor electrode material. [Display omitted] •Polyoxometalate embedded with Fe2O3 displayed electroactive sites for aniline.•Electrodeposited polyaniline exhibited high porosity and electrochemical channels.•XPS confirms the role of nitrogen and Fe2O3 boosted electrochemical redox behavior.•Supercapacitor showed Cs of 528 F/g and energy density of 33.4 Wh/kg
ISSN:0925-8388
DOI:10.1016/j.jallcom.2024.177306