Temperature-influenced synthesis of copper cobaltite electrodes for high-performance and sustainable asymmetric supercapacitor applications
摘要
Transition metal oxides (TMOs) are widely regarded as potential electrode material for high-performance supercapacitors. In this study, CuCo2O4 was synthesised by a facile solvothermal route using ethanol as green solvent. A systematic study was conducted to assess the impact of solvothermal temperature on the morphological and electrochemical performance of CuCo2O4. The variation in solvothermal temperature resulted in the formation of distinct morphologies, such as microspheres at 120˚C, urchin-like structures at 150˚C, and flower-like architectures at 180˚C, as confirmed by FE-SEM and HR-TEM analyses. Among the synthesized samples, the material prepared at 150˚C (denoted as C-5) with urchin-like morphology exhibited the highest specific surface area of about 75.5 m2g− 1. The electrochemical measurements also revealed that CuCo2O4(C-5) exhibits a maximum specific capacitance of 1133 F g− 1 at a current density of 1 A g− 1 and a capacitance retention of 82% after 8000 cycles in a three-electrode setup. The fabricated CuCo₂O₄(C-5)@NF // AC@NF-ASC device delivers a Csp value of 156 F g− 1 at 1 A g− 1, retaining 80% initial capacitance over 8000 cycles. The device also exhibited a high energy density of 76 Wh kg− 1 at a power density of 2040 W kg− 1. In addition, the ASC device was powered a red LED, demonstrating its practical applicability for energy storage applications.