Electrochemical analysis of asymmetric supercapacitors based on BiCoO3@g-C3N4 nanocomposites

Supercapacitors are gaining popularity these days because of their good cycle stability, superior specific capacitance, high power density, and energy density. Herein, we report the synthesis of bismuth cobalt oxide (BiCoO3) combined with graphitic carbon nitride (g-C3N4) by the hydrothermal method....

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2023-10, Vol.52 (38), p.13704-13715
Main Authors: Varatharajan, Pandiaraja, Shameem Banu, I B, Mohamad Hafiz Mamat, Vasimalai, Nagamalai
Format: Article
Language:English
Subjects:
Activated carbon
Asymmetry
Bismuth
Capacitance
Carbon nitride
Charge transfer
Cobalt oxides
Electrochemical analysis
Electrode materials
Electrodes
Energy storage
Impedance spectroscopy
Nanocomposites
Spectrum analysis
Supercapacitors
Synergistic effect
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Summary:Supercapacitors are gaining popularity these days because of their good cycle stability, superior specific capacitance, high power density, and energy density. Herein, we report the synthesis of bismuth cobalt oxide (BiCoO3) combined with graphitic carbon nitride (g-C3N4) by the hydrothermal method. The BiCoO3@g-C3N4 nanocomposite was well characterized using XRD, FE-SEM, FT-IR, and DRS-UV techniques. The supercapacitor properties of the BiCoO3@g-C3N4 nanocomposite were then studied using cyclic voltammetry, galvanic charging–discharging, and impedance spectroscopy techniques. Due to the synergistic effect, BiCoO3@g-C3N4 showed a high specific capacitance value of 341 F g−1 at a current density of 1 A g−1 and excellent retention of specific capacitance (98.82%) after 1000 cycles and a high power density of 1125 W kg−1. Using the impedance spectroscopy technique, the charge transfer resistance of BiCoO3, g-C3N4, and BiCoO3@g-C3N4 was measured. BiCoO3@g-C3N4 showed a low charge transfer resistance compared with BiCoO3 and g-C3N4. The asymmetric supercapacitor (ASC) device was prepared using activated carbon (negative side) and BiCoO3@g-C3N4 (positive side) electrodes. It showed a specific capacitance of 129 F g−1 at 1 A g−1, power density 2800 W kg−1 and energy density 35 W h kg−1. Finally, we conclude that, due to the high specific capacitance, good cycle retention, fast redox activity, and low charge transfer resistance BiCoO3@g-C3N4 is a good electrode material for energy storage applications.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt01758c