In present study, zinc oxide/zinc sulfide (ZnO/ZnS) nanostructures were fabricated by anodization of Zn. The morphological, structural and compositional properties of ZnO/ZnS were studied by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). From FESEM results, welldefined and smooth spherical-like ZnO/ZnS nanostructures were obtained with tube-like ZnO nanostructures underneath the compact layer. XRD patterns revealed that achieved materials offer high crystallinity hexagonal ZnO as dominant with hexagonal close-packed polycrystalline Zn. Moreover, measure of water contact angle was realized to learn about wetting property of the electrodes. Electrochemical impedance spectroscopy (EIS) was recorded to examine electrocatalytic performance of electrodes against hydrogen evolution reaction (HER) in 1 M KOH solution. The values of energy consumption and energy efficiency were calculated as 571.9 kJ mol −1 and 49.5% at current density of 50 mA cm −2 for the HER on 40-ZnO/ZnS/Zn electrode at 25 C.

No abstract

No abstract

No abstract

The ZnO nanorod (NR) structures used as photocatalyst in the photocatalytic degradation of methylene blue (MB) dye were synthesized by the hydrothermal method and doped with Ag using the chemical precipitation method. The results of Field Emission‐Scanning Electron Microscopes (FE‐SEM) showed that after the heat treatment, ZnO nanoplate structures were broken, leaving only hexagonal ZnO‐NR structures and Ag nanoparticles with a diameter of approximately 92 nm occurred on the ZnO‐NR surface as a result of Ag doping. The results of X‐Ray Diffraction (XRD) revealed that pure hexagonal ZnO crystals and face‐centered cubic Ag structures were present. The data showed that the photodegradation efficiency for 20 mg/L methylene blue (MB) dye without H2O2 reached 98 % at 300th minute and 100 % after 60 minutes in the presence of H2O2. The results showed that the Ag‐Doped ZnO‐NR structures immobilized into Ca and Cu alginate beads provide the high photocatalytic removal efficiency in the presence of H2O2 in a short time.