Synthesis, Structural, And Electrochemical Studies of Nanostructured FeWO₄ as Anode for Sodium-Ion and Lithium-Ion Batteries

Abstract

In this study, nanostructured iron tungstate (FeWO₄) was synthesized using a facile hydrothermal method and investigated as a potential anode material for both sodium-ion and lithium-ion batteries. Comprehensive structural characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) confirmed the formation of pure-phase nanostructures with high surface area and uniform morphology. Electrochemical performance was evaluated through cyclic voltammetry (CV), galvanostatic charge–discharge testing, and electrochemical impedance spectroscopy (EIS). The FeWO₄ electrode demonstrated excellent cycling stability, high specific capacity, and good rate capability for both Na⁺ and Li⁺ storage, owing to its stable crystal structure and enhanced ion diffusion pathways. These findings suggest that nanostructured FeWO₄ is a promising candidate for next-generation energy storage systems.