High-Performance Hybrid Asymmetric Supercapacitors with rGO/α-Fe۲O۳ and rGO/TiO۲ Nanocomposites

Hybrid asymmetric supercapacitors using distinct cathode/anode materials offer enhanced energy density by expanding operational potential windows compared to symmetric configurations. In this work rGO/α-Fe₂O₃ and rGO/TiO₂ nanocomposites were synthesized via hydrothermal method for hybrid asymmetric supercapacitors applications. Field emission scanning electron microscope (FESEM) revealed uniform distribution of spherical α-Fe₂O₃ and TiO₂ nanoparticles on rGO sheets. The X-ray diffractometry (XRD) analysis confirmed the presence of the hematite and anatase in the rGO/α-Fe۲O۳ and rGO/TiO۲ nanocomposites, respectively. Additionally, in the XRD spectra of both nanocomposites, a broad peak corresponding to the (۰۰۲) crystalline planes of rGO was observed. Electrochemical testing showed specific capacities of ۱۳۰ F/g (rGO/α-Fe₂O₃) and ۲۵۳ F/g (rGO/TiO₂) at ۵ mV/s in ۱M KOH. The assembled hybrid asymmetric supercapacitors (rGO/α-Fe₂O₃//rGO/TiO₂) achieved a ۱.۶ V operational potential window. Power density and energy density of ۱۰۶۶ W kg-۱ and ۹.۷ Wh kg-۱ were achieved at a current density of ۱ A/g, respectively.

کلیدواژه ها:

Hybrid Asymmetric supercapacitor ، Graphene oxide ، rGO/α-Fe۲O۳ ، rGO/TiO۲ ، nanocomposite