Designing an affordable device that seamlessly combines efficient electrochemical energy storage with straightforward, robust protocols represents a promising pathway for ushering in the next generation of green power solutions and fostering a sustainable society. In this work, CoMoO4, vanadium-doped CoMoO4 (V-CoMoO4), and fluorine-vanadium-doped CoMoO4 (F-V-CoMoO4) were synthesized in situ on nickel foam (NF) using a hydrothermal method, followed by thermal treatment, resulting in a hierarchical structure with interconnected nanosheets and open porous channels. V2C MXene was used as the vanadium source, which was fully oxidized during the synthesis. This unique architecture is particularly advantageous for supercapacitor applications, as it facilitates efficient electrolyte flow, promotes the formation of oxygen defects that enhance ion transport, and ultimately maximizes electrochemical performances. At a current density of 2.5 mA/cm2, the F-V-CoMoO4 electrode achieves an areal capacitance of approximately 2250 mF/cm2 (900 F/g at 1 A/g), outperforming pristine CoMoO4 (180 mF/cm2, 72 F/g) and V-doped CoMoO4 (810 mF/cm2, 324 F/g). An asymmetric supercapacitor is fabricated using an F-V-CoMoO4@NF//AC@NF device and PVA/KOH gel electrolyte, showing excellent redox behavior and cycling stability, with 100% capacity retention after 2000 cycles at a current density of 1 Ag-1. Moreover, the developed device exhibits a specific energy density of 11.5 Whkg-1 and a power density of 225 Wkg-1 at a current density of 0.3 A/g. These findings highlight the potential of F-V doping in enhancing the electrochemical properties of CoMoO4-based electrodes.

Department of Inorganic Chemistry University of Chemistry and Technology Prague Technicka 5 166 28 Prague 6 Czech Republic

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