Publication date: 21st July 2025
The development of affordable and efficient energy storage devices is essential for advancing green power technologies and achieving a sustainable future. In this work, we report the in situ synthesis of CoMoO₄, vanadium-doped CoMoO₄ (V–CoMoO₄), and fluorine–vanadium co-doped CoMoO₄ (F–V–CoMoO₄) on nickel foam (NF) via a hydrothermal method followed by thermal treatment. The resulting hierarchical architecture, composed of interconnected nanosheets and open porous channels, enhances electrolyte penetration, promotes oxygen defect formation, and improves ion transport, making it highly suitable for supercapacitor applications. Electrochemical testing revealed that the F–V–CoMoO₄ electrode delivers an outstanding areal capacitance of ~2250 mF cm⁻² at 2.5 mA cm⁻², significantly surpassing pristine CoMoO₄ (180 mF cm⁻²) and V–CoMoO₄ (810 mF cm⁻²). An asymmetric supercapacitor device (F–V–CoMoO₄@NF//AC@NF) demonstrated excellent redox activity and remarkable cycling stability, retaining 100% capacity after 200 cycles at 1 A g⁻¹. Furthermore, the device achieved an energy density of 6.7 Wh kg⁻¹ and a power density of 510 W kg⁻¹ at 0.6 A g⁻¹. These results underscore the effectiveness of fluorine–vanadium co-doping in enhancing the electrochemical performance of CoMoO₄-based electrodes, offering a promising pathway for next-generation supercapacitor technologies.
The research leading to these results was supported by the Johannes Amos Comenius Programme, European Structural and Investment Funds, project CHEMFELLS V (No. CZ.02.01.01/00/22_010/0003004) and project 'CHEMFELLS VII‘ (No. CZ.02.01.01/00/22_010/0008809).
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