Exploring the potential of bismuth vanadate nanoparticles in supercapacitor technology

Abstract

Supercapacitors have attracted significant attention as a promising energy storage technology due to their high power density and rapid charge-discharge capabilities. In this study, we synthesized bismuth vanadate (BiVO₄) with varying molar ratios using the sol-gel combustion method and evaluated their effectiveness as supercapacitor electrodes. Crystallographic and morphological analyses confirmed the formation of nanoparticles with different phases. The vanadium-rich BiVO₄ compound electrode exhibited a maximum specific capacitance of 893 F·g^–1 at a current density of 0.5 A·g^–1 and demonstrated superior rate capability. Additionally, an all-solid-state asymmetric supercapacitor, fabricated using vanadium-rich BiVO₄ and activated carbon along with a gel electrolyte, achieved an energy density of 6.66 Wh·kg^–1 at a power density of 600 W·kg^–1 and sustained 86% capacitance retention after 10000 cycles. These results highlight the potential of Bi-V compounds in energy storage applications.

Graphical abstract

Keywords

BiVO₄ / supercapacitor / energy storage / sol-gel combustion method

References

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Competing interests

The authors declare that they have no competing interests.

Acknowledgements

The authors extend their thanks to the Researchers Supporting Project Number (RSP2025R348), King Saud University, Riyadh, Saudi Arabia. The author PEL thankful to ANID for the FONDECYT fellowship (#3230388). The author RU thanks under ANID, CHILE for the financial support the FONDECYT #11220335.

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