Electrodeposited copper–cobalt bimetallic electrodes with superior electrochemical performance for hybrid supercapacitors
摘要
The performance of supercapacitors largely depends on the careful design and optimization of electrode materials, which play a vital role in ensuring long-term stability. An ideal electrode material possesses promising reversibility, fast kinetics, excellent stability, long cycle life, and environmental friendliness. Electrodeposition (ED) offers a straightforward, safe, and eco-friendly method for developing electrodes. This work presents an innovative, reliable, and cost-effective approach for fabricating high-performance supercapacitor electrodes by directly synthesizing Cu–Co bimetallic electrodes via the ED method, with careful control of the Cu and Co ratio to tailor the structural and electrochemical properties. The developed electrodes were physico-chemically characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy-dispersive X-ray (EDS) analyses. The fabricated Cu–Co electrodes after deposition at -2.0 V for 30 min exhibited a specific capacitance of 424.48 F g⁻1 at 1 A g⁻1, with 82% capacitance retention after 5000 continuous charge–discharge cycles. The Cu–Co//AC asymmetric supercapacitor exhibited an energy density of 13.45 Wh kg−1 and a power density of 4368.6 W kg−1, while maintaining a high coulombic efficiency of 98%. The synergistic effect between Cu and Co enhanced electrochemical performance, resulting in improved capacitance, and cycling stability. This study successfully demonstrated the potential of Cu–Co bimetallic electrodes for high-performance supercapacitor applications.