Preparation and electrochemical investigation of two-component HoFeO₃/g-C₃N₄ nanocomposites as potential electrode materials for supercapacitor applications

The present investigation employed a sonochemichal method to enhance the capacitive properties of nano-sized HoFeO₃ perovskites compound (HFO) by combining with different amounts of nanolayered g-C₃N₄ (HoFeO₃/g-C₃N₄-x% (x = 10, 25, 50). The various techniques were used to investigate the physiochemical features of the as-synthesized nanostructures. Also, pure HFO and HFO/CN-x% nanostructures were studied as an active material for supercapacitor application by several electrochemical technologies. HFO/CN-50% nanostructure as optimum sample delivered superior specific capacitance of 698.8 F g−1 at a constant current density of 2 A g−1. The capacity of HFO/CN-50% nanostructure is found to be higher from the capacities of HFO (242.8 F g−1), HFO/CN-10% nanostructure (277.2 F g−1) and HFO/CN-25% nanostructure (472.8 F g−1).Also, after 1100 charge-discharge cycles, HFO/CN-50% electrode was able to retain about 83.13% of its initial specific capacitance. Further, asymmetric supercapacitor device (ASC: NF/AC//HFO/CN-50%/NF) was designed by HFO/CN-50% as positive electrode and activated carbon (AC) as negative electrode, respectively. ASC device was exhibited specific capacitance of 264.77 F g−1 at 2 A g−1. The NF/AC//HFO/CN-50%/NF delivers the high energy density of 62.15 W h Kg−1 with the power density of 1300.06 W kg−1. These results highlight HFO/CN-50% nanocomposites as a highly efficient electrode material, demonstrating strong potential for next-generation hybrid supercapacitors.