Achieving High Energy Density in Supercapattery by Employing CuFe2O4 Microsheets and Bi2O3 Microspheres

In this work, we report a high energy density supercapattery device were employing hydrothermally synthesized two-dimensional CuFe2O4 microsheets as cathode and synthesized redox-active Bi2O3 microsphere as the anode. The charge storage characteristics of the electrode materials were detailed studied. Herein, the 2D-CuFe2O4 microsheet-based positive electrode showed an enhanced areal capacitance and cyclic stability of 1279 mF cm−2 and 98% after 5000 GCD cycles, respectively. Moreover, Bi2O3 microspheres electrode material delivered a favourable capacitance of 1368.25 mF cm−2 and noticeable cyclic stability of 81% even after 3000 GCD counts. Both the positive and negative electrodes showed excellent electrochemical performance owing to their vast electrochemical active sites, which induce fast electron/ion transportation. Furthermore, a supercapattery device was assembled employing CuFe2O4/Ni-foam as cathode and Bi2O3/Ni-foam as anode for evaluating its real-time performance. This supercapattery device delivers a high energy density and power density of 67.55 µ Wh cm−2 and 3200 µ W cm−2, respectively, in the optimal 1.6 V cell voltage. Moreover, the device showed a good cycling stability value of 87.4% with noticeable coulombic efficiency of 99.2% with the 10,000 cycles. These electrochemical results suggest that the assembled device was esteemed the highly beneficial energy storage system.