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Owing to its distinctive structure and variable oxidation states, Tungstate-based oxides have become a high-potential electrode material for supercapacitors (SCs). However, the insufficient active sites and the slow kinetics of charge transport hinder its practical application in SCs fields. Doping anion has been demonstrated to be a feasible approach to improve the electrochemical performance of electrode materials. Herein, F-doped ZnWO4 (denoted as F-ZnWO4) with nanosheet arrays were synthesized on nickel foam by hydrothermal method. The effects of doping F on the microstructure and electrochemical properties of F-ZnWO4 are systematically studied. It provides additional ion transport channels for redox reactions, enhances the conductivity of the electrode material, and provides abundant active sites, thereby promoting the charge transfer kinetics of the electrode material. It indicates that doping F can reshape the morphology of F-ZnWO4, expand the lattice spacing and induce some oxygen vacancies (OV). Compared with ZnWO4, the Ov concentrations of F-ZnWO4-2 increase from 20.10 % to 36.29 %. F-ZnWO4-2 electrode has a specific capacitance of 1450.0 F/g at a current density of 1 A/g and retains a capacitance of 1353.1 F/g even at a higher current density of 10 A/g. The assembled F-ZnWO4-2//RuO2-ZnO asymmetric supercapacitor (ASC) exhibits an energy density of 37.4 Wh/kg and a corresponding power density of 831.4 W/kg. Two series-connected ASCs can lighten six LED lights for 6 min. It provides a way to further develop low-capacitance metal oxide materials in the field of electrochemical energy storage. © 2025
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Journal of Energy Storage
ISSN: 2352-152X
Year: 2025
Volume: 118
8 . 9 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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