Electrochemical synthesize and characterization of ZnO / ZnS nanostructures for hydrogen production

Abstract

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.

Fabrication of 3D‐printed graphene/polylactic acid and carbon nanofiber/polylactic acid electrodes: New solvent‐free electrochemical activation method for hydrogen evolution reactions

“…EIS results of all 3D electrodes show that; as the applied overpotentials increased, the resistance values decreased. This is attributed to that the electron transfer throughout the procedure of H + reduction accelerated 14 . The obtained electrochemical parameters from the fitting of EIS outcomes were listed in Table 4.…”

“…This is attributed to that the electron transfer throughout the procedure of H + reduction accelerated. 14 The obtained electrochemical parameters from the fitting of EIS outcomes were listed in Table 4. As seen in Table 4, R ct and R ad 's values decrease as the GRP ratio increases in ) GRP/PLA 3D electrodes and as the CNF ratio increases in CNF/PLA 3D electrodes.…”

“…Among these energy sources, hydrogen has recently been suggested as a promising alternative with its features such as high energy carrier and clean emission 1,3,10–13 . Hydrogen gas can be manufactured by different methods 1,14,15 . Among these methods, electrolysis of water is one of the simplest and most promising production techniques 16–18 .…”

“…1,3,[10][11][12][13] Hydrogen gas can be manufactured by different methods. 1,14,15 Among these methods, electrolysis of water is one of the simplest and most promising production techniques. [16][17][18] Because in this method, large-scale and high-purity sustainable hydrogen gas can be produced without any environmental pollution.…”

Free-standing Co/Zn sulfide supported on Cu-foam for efficient overall water splitting

“…48 As a semiconductor metal sulfide, ZnS was reported as an electrochemical catalyst for the HER. 49 XRD spectra of CoZn-S/Cu-F were also collected after the OER and HER stability tests (Fig. S5, ESI†).…”