Hierarchically Configured CuCo2O4@rGO Nanocomposite Electrodes Facilitating Rapid Redox Kinetics and Enhanced Electrochemical Performance
摘要
Hierarchically structured CuCo₂O₄@rGO nanocomposites were developed to enhance charge storage behavior and optimize electrochemical performance for energy storage applications. Structural analyses have substantiated the emergence of a crystalline spinel CuCo₂O₄ phase consistently affixed to conductive rGO sheets, thereby establishing a robust hybrid architecture. The BET analysis demonstrated a mesoporous architecture characterized by a specific surface area of approximately 10.88 m2 g−1 and an average pore radius of around 8.99 nm, facilitating effective electrolyte diffusion and enhancing the availability of electroactive sites. Raman spectroscopy revealed distinct spinel vibrational modes of CuCo₂O₄, alongside the D and G bands of graphene, thereby affirming the successful hybridization and robust interfacial interaction between the oxide and the graphene Structure. The XPS analysis provided additional confirmation of the mixed valence states of Cu2+/Cu+ and Co2+/Co3+, with minor shifts in binding energy suggesting interfacial charge transfer between CuCo₂O₄ and rGO. Morphological investigations demonstrated a consistent distribution of CuCo₂O₄ nanoparticles across wrinkled graphene sheets, effectively inhibiting agglomeration and enhancing electrical conductivity. Electrochemical measurements revealed a synergistic mechanism for charge storage, integrating faradaic pseudocapacitance from CuCo₂O₄ with electric double-layer capacitance from rGO. As a result, the composite achieved an impressive specific capacitance of 572.42 F g−1 at 1 A g−1, demonstrating remarkable cycling stability and underscoring its promise for sophisticated supercapacitor applications.