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Metal-Free Nitrogen-Enriched Graphitic Carbon Nitride Architectures for Advanced Supercapacitor Energy Storage: Design, Synthesis, and Electrochemical Performance Optimization
Abstract This thesis addresses the urgent global requirement for efficient energy storage materials by developing and characterizing advanced graphitic carbon nitride (g-C3N4)-based electrode materials for supercapacitors. A facile, low-cost thermal polymerization method produces 2D nitrogen-rich GC...
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| Format: | Thesis |
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AUC Knowledge Fountain
2026
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| Summary: | Abstract
This thesis addresses the urgent global requirement for efficient energy storage materials by developing and characterizing advanced graphitic carbon nitride (g-C3N4)-based electrode materials for supercapacitors. A facile, low-cost thermal polymerization method produces 2D nitrogen-rich GCN nanosheets exhibiting excellent electrochemical stability and wide voltage windows, enabling symmetric devices with 19.33 Wh/kg energy density and remarkable cycling stability over 21,000 cycles. To overcome intrinsic limitations of pristine GCN, a 3D/2D metal free composite with bio-derived carbon (Bio-Cx) is synthesized, delivering high capacitance, wide potential windows, and ultrahigh energy density of 53.72 Wh/kg in asymmetric configurations paired with mesoporous nitrogen-doped carbon (MPNDC). Extensive physicochemical and electrochemical analysis elucidates charge storage mechanisms, stability, and synergistic effects of composite architectures, confirming their dual functionality as positive and negative electrodes. This work advances the fundamental understanding and practical deployment of metal-free, sustainable, high-performance supercapacitor electrodes targeting scalable renewable energy storage technologies. |
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