Akademik Veri Yönetim Sistemi
Materials Science and Engineering: B, cilt.327, 2026 (SCI-Expanded, Scopus)
Developing high-performance electrode materials remains a major challenge for advancing supercapacitor technology, primarily due to the limited electrical conductivity and cycling instability of conventional transition-metal oxides. In this work, ZnO/MnO2 nanocomposites were synthesized via a hydrothermal route to exploit the complementary properties of MnO2's pseudocapacitive redox activity and ZnO's structural stability and electron transport capability. Structural and morphological analyses by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX) confirmed the successful formation of a ZnO/MnO₂ composite with strong interfacial coupling. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in a three-electrode configuration were used to determine the electrochemical performance. Electrochemical characterization demonstrated significantly enhanced capacitance and charge-storage kinetics, achieving 1152 F g−1 at 0.8 A g−1 (GCD) and 685 F g−1 at 5 mV/s (CV). The composite further delivered an energy density of 31.4 Wh kg−1 and a power density of 712 W kg−1, supported by reduced charge-transfer resistance in EIS. These results confirm a well-balanced capacitive and diffusion-controlled contribution in the combined composites, indicating synergistic charge-transfer kinetics and further clarifying the charge-storage process, as described by Dunn's model. The findings underscore ZnO/MnO2 nanocomposites as promising electrode materials capable of delivering high energy-storage efficiency and improved cycling behavior, providing a viable pathway toward advanced next-generation supercapacitors.