Designing a flexible all-solid-state supercapacitor based on CuGa2O4 and FeP-rGO electrodes

Herein, we have fabricated a flexible solid-state asymmetric supercapacitor (FSASCs) with superior performance using CuGa₂O₄/nickel foam and FeP-rGO/nickel foam electrodes as the positive and negative electrodes respectively. The CuGa₂O₄/nickel foam electrode presents remarkable electrochemical performance, such as good specific capacitance (SC) of 1210.40 F g⁻¹ with considerable rate capability and significant cycling stability. Furthermore, the FeP-rGO/nickel foam electrode depicts good electrochemical properties containing a high specific capacitance (SC) of 376.50 F g⁻¹ with a good rate capability and remarkable durability. Due to the excellent electrochemical performance of CuGa₂O₄/nickel foam and FeP-rGO/nickel foam electrodes, the FSASC represents remarkable electrochemical performance such as SC of 202.10 F g⁻¹, an energy density (ED) of 63.15 Wh k g⁻¹. Furthermore, a flexible solid-state symmetric supercapacitor (FSSSC) was assembled using CuGa₂O₄/nickel foam as positive and negative electrodes, respectively. The FSSSC delivers a high SC of 275.65 F g⁻¹ and good ED of 38.27 Wh kg⁻¹ with excellent durability.