Boosting charge storage in ZnFe2O4 nanostructures through morphological tuning using Fluoride-Ion Mediation
ZnFe2O4 (ZFO) nanostructures were synthesized via a hydrothermal method using NH4F as a morphologydirecting agent, enabling controlled evolution from spherical nanoparticles to uniform nanorods (50–100 nm length, 10–20 nm diameter). XRD confirmed the pure cubic spinel phase, while TEM/EDS verified the polycrystalline nature and stoichiometric Zn:Fe:O ≈ 1:2:4 composition. Electrochemical studies revealed that ZFO- 0.12M-AF nanorods exhibited superior performance due to their anisotropic architecture, which promoted ion diffusion and enhanced redox activity. The nanorods delivered a high specific capacitance of 189 F/g at 11 A/g, with a 93 % diffusion-controlled contribution, improved diffusion coefficient, and reduced series resistance (1.7 Ω vs. 2.0 Ω at 0.03 M). They also achieved notable areal (3.16 F/cm2) and volumetric (19.77 F/cm3) capacitances. In an asymmetric device (ZFO-0.12M-AF//AC), the electrode delivered 8.23 Wh/kg at 539.32 W/kg with 89 % capacitance retention after 10,000 cycles. This study highlights NH4F’s dual role in morphology control and performance enhancement.
ZnFe2O4 (ZFO) nanostructures were synthesized via a hydrothermal method using NH4F as a morphologydirecting agent, enabling controlled evolution from spherical nanoparticles to uniform nanorods (…
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