Facile and cost-effective synthesis of flower-like RGO/Fe ₃ O ₄ nanocomposites with ultra-long cycling stability for supercapacitors

The RGO/Fe ₃ O ₄ nanocomposites were synthesized by an easy and cost-effective graphenothermal process during which GO and Fe ₂ O ₃ were reduced to RGO and Fe ₃ O ₄ , thus forming the RGO/Fe ₃ O ₄ nanocomposite. This material possesses high specific surface area of 141.3 m ²  g ⁻¹ and average pore diameter of 5.8 nm. The RGO/Fe ₃ O ₄ nanocomposites showed excellent electrochemical performance in supercapacitors (SCs). As a SC electrode, it exhibited an excellent specific capacitance (C _s ) of 498 F g ⁻¹ at a scan rate of 10 mV s ⁻¹ and maintained 98.7% of capacitance retention at 500 mV s ⁻¹ over 5000 cycles. Moreover, it exhibited 94% of capacitance retention over 10,000 cycles at a current density of 3 A g ⁻¹ . So, the developed RGO/Fe ₃ O ₄ nanocomposite materials here hold high potential for energy storage applications.