부산대학교 도서관

Co-electrodeposition technique has been used to elaborate flower-like CuO/ZnO nanocomposites on aluminum (Al) foil and indium tin oxide (ITO) coated glass substrates. Different CuO/ZnO composite films with different Cu/Zn ratios were fabricated by modifying the concentration of the copper concentration in the solution. SEM observation of CuO/ZnO nanocomposite surface indicates a flower-like morphology. The results of XRD and FTIR characterization confirmed the elaboration of CuO/ZnO nanocomposites. It was shown that the increase of Cu2+ concentration in the bath causes a decrease in CuO/ZnO band gap (from 3.13 to 2.05 eV). The contact angle measurements indicate that surface of the elaborated nanocomposite is hydrophilic. In addition, a high PL intensity in the visible was obtained, with a Cu/Zn ratio to 0.73, which decreases with the increase of the CuO/ZnO composite thickness. The electrochemical performance of CuO/ZnO nanocomposite studied as working electrode in a three-electrode cell configuration in a stable organic electrolyte (LiPF6/ethylene carbonate (EC) and diethyl carbonate (DEC) with vinylene carbonate (VC)) exhibited reduction and oxidation peaks corresponding to the formation of LiZn and to the multistep dealloying process of LiZn alloy, respectively. Finally, as-prepared CuO/ZnO electrode exhibited the better electrochemical performance with a higher integrated area than pure ZnO electrode. The obtened results indicat that the nanocomposite electrode can be a good candidate as anode for Li-ions batteries. [ABSTRACT FROM AUTHOR]