Synthesis of Jackfruit Peel Derived N, S Co-Doped Activated Carbon/FeHCF Hybrid Electrode for High Performance Supercapacitor Applications
摘要
The development of sustainable, high-performance supercapacitor electrodes is vital for next-generation energy storage. In this study, a novel hybrid electrode composed of iron hexacyanoferrate (FeHCF) and nitrogen/sulfur co-doped activated carbon (NSAC), derived from jackfruit peel, was synthesized via an ultrasonication-assisted co-precipitation method. Powder X-ray diffraction (XRD) confirmed the formation of a face-centered cubic FeHCF structure alongside the amorphous nature of NSAC. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the uniform dispersion of FeHCF nanoparticles across the porous carbon matrix. Textural analysis showed a surface area of 425 m2 g−1 with mesoporous characteristics for the FeHCF/NSAC composite. In a three-electrode configuration, the FeHCF/NSAC electrode delivered a high specific capacity of 45.5 mAh g−1 (164 C g−1) at 1 A g−1, significantly outperforming pristine FeHCF. When assembled into an asymmetric FeHCF/NSAC‖NSAC device, it achieved a specific capacity of 16.4 mAh g−1, a maximum energy density of 28.6 Wh kg−1 at 810 W kg−1, and retained ~ 92% of its initial capacity after 5000 cycles, demonstrating excellent durability. The enhanced performance is attributed to the synergistic coupling between the pseudocapacitive FeHCF framework and the conductive, defect-rich NSAC scaffold, which facilitates efficient electron/ion transport and structural stability. This study presents a cost-effective and environmentally sustainable strategy for fabricating robust energy-storage electrodes from agro-waste-derived carbon, offering promising potential for scalable supercapacitor applications.
Graphical Abstract