用于先进储能应用的高性能ZnO/CuO/CoO纳米复合材料的合成与表征

The synthesis of zinc-based ternary composite quantum dots (CQDs), combining ZnO, CuO, and CoO via the Chemical Precipitation method, marks a significant advancement in energy storage application. X-ray Diffraction (XRD) analysis revealed a mixed semicrystalline and amorphous structure, highlighting the complex nature. UV–Visible Spectroscopy indicated a semiconductor energy band gap of 1.76 eV, suggesting potential for high conductivity. Advanced characterization using Photoluminescence (PL), SEM, EDX, TEM with SAED, XPS, Cyclic Voltammetry (CV), Galvanostatic Charge–Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS) provided a comprehensive understanding of its structural, optical, and electrochemical properties. The synthesized CQDs exhibited distinct pseudocapacitive behaviour in 3 M KOH electrolyte, with GCD tests revealing a discharge duration of nearly 400 s at 1 Ag⁻ 1 . Specific capacitance values were 1914 Fg⁻ 1 at 2 Ag⁻ 1 and 1890 Fg⁻ 1 at 3 Ag⁻ 1 , demonstrating high-rate performance. Energy density peaked at ~ 54 Whkg⁻ 1 , with a maximum power density of ~ 4419 Wkg⁻ 1 . Stability tests showed retention of specific capacitance between 350 and 380 Fg⁻ 1 over 1000 cycles at 5 Ag⁻ 1 , with above ~ 97% coulombic efficiency. EIS analysis indicated complex electrochemical behaviour, with maximum conductivity of 5.5 × 10⁻ 2 S/cm, underscoring the material’s promise for energy storage applications.