The rapid increase of battery and carbon waste has raised an urgent demand for efficient recycling methods, along with the development of environmentally friendly energy storage materials. In this study, zinc ferrite (ZnFe2O4, ZFO) was synthesized from spent batteries, while graphene nanosheets (GNs) was obtained from recycled carbon, and then combined to form ZFO@G composites for supercapacitor applications. Characterization techniques including XRD, Raman, SEM, and electrochemical analyses (CV, GCD, EIS) were employed to elucidate the crystal structure, surface morphology, and electrochemical performance of the materials. The results reveal that the incorporation of GNs improves the electrochemical performance of ZFO, delivering a specific capacitance of 606.69 F g–1 at 1 A g–1 with a capacitance retention of ∼58.8% after prolonged cycling. This study not only demonstrates the potential of recycled materials for supercapacitor applications but also contributes to mitigating environmental issues caused by battery waste.
Vuong et al. (Sun,) studied this question.