Abstract

In the present study, a co-precipitation method was used to synthesize CuBi2O4 nanoflakes (NFs), and a CuBi2O4/ biomass-derived activated carbon (AC) composite was prepared via sonication and investigated as a promising supercapacitor electrode material. Despite the intrinsic redox activity of CuBi2O4, its practical application is limited by low electrical conductivity and restricted surface area. To address these challenges, a porous AC matrix was introduced to enhance the electrochemical performance. Electrochemical measurements, including cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD), revealed that the CuBi2O4/AC composite exhibited a significantly enhanced specific capacitance of 228 F gg- 1 at 5 mV s-1 and 170 F g- 1 at 1 A g- 1, compared to 131 F g- 1 and 105 F g- 1 for pristine CuBi2O4. Electrochemical impedance spectroscopy (EIS) analysis indicated a lower charge-transfer resistance. These findings suggest that the CuBi2O4/AC composite is a promising candidate for sustainable supercapacitor electrode applications with improved electrochemical performance.