Development of AgCoO2/g-C3N4 nanocomposite: A robust catalyst for dual-functionality in high-performance supercapacitors and photocatalytic dye degradation

Addressing the dual challenges of sustainable energy storage and water purification, this study presents a bifunctional AgCoO₂/g-C₃N₄ nanocomposite engineered for high-performance electrochemical and photocatalytic applications. The composite was synthesized via a simple hydrothermal process, resulting in nanoplate-like AgCoO₂ uniformly anchored onto g-C₃N₄ nanosheets. Notably, the incorporation of g-C₃N₄ enhances the overall amorphous nature of the composite, which plays a critical role in boosting both charge storage and photocatalytic activity. Comparative studies with pure AgCoO₂ and g-C₃N₄ confirm the superior performance of the hybrid material. Electrochemical analysis revealed excellent pseudocapacitive behavior, delivering a high specific capacitance of 867.5 F/g at 1 A/g and outstanding cycling stability with 90 % capacitance retention after 12,000 cycles. Simultaneously, the composite exhibited enhanced photocatalytic efficiency, degrading 92 % of methylene blue under visible light within 120 min. The synergistic integration of AgCoO₂ with amorphous-rich g-C₃N₄ improves charge separation, light absorption, and surface reactivity, enabling effective dual-functionality. These findings highlight AgCoO₂/g-C₃N₄ as a promising candidate for next-generation supercapacitor devices and advanced wastewater treatment technologies.