Artocarpus Heterophyllus Peel–derived Nitrogen Doped Carbon/ZincHexacyanoferrate Hybrid Electrode for High-performance Supercapacitor Applications
摘要
The growing demand for efficient and sustainable energy storage systems has driven the need for innovative electrode materials that provide high capacitance, extended cycle life, and environmental compatibility. Conventional electrode materials frequently exhibit poor energy density and restricted structural stability. This work involved the fabrication of a nitrogen-doped activated carbon/zinc hexacyanoferrate (N-AC/ZnHCF) hybrid electrode utilizing biomass generated from jackfruit peels as a sustainable carbon source. XRD studies validated the crystalline structure of ZnHCF, whilst BET tests indicated a substantial increase in surface area from 50 m² g⁻¹ (ZnHCF) to 95 m² g⁻¹ (N-AC/ZnHCF), hence enhancing ion transport. SEM and TEM investigations demonstrated a uniform distribution of ZnHCF nanoparticles over the porous carbon matrix, while XPS confirmed effective nitrogen doping and the existence of redox-active species. The N-AC/ZnHCF electrode exhibited a high specific capacity of 457 C g-1 in a three-electrode system and 247 C g-1 in a two-electrode arrangement. The asymmetric supercapacitor device attained an energy density of 48.5 Wh kg⁻¹ at a power density of 750 W kg⁻¹, demonstrating remarkable cycling stability of 91.6% after 5000 cycles. These findings illustrate the promise of biomass-derived hybrid electrodes as sustainable and high-performance materials for next-generation supercapacitor applications.