Journal of Iranian Ceramic Society
Journal of Iranian Ceramic Society
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University of Tabriz , mohammadiaref@tabrizu.ac.ir
Abstract: (211 Views)
Crystalline nanostructured zinc oxide and titanium dioxide thin layers were prepared using the spin-coating method. Their structural and optical properties were characterized using X-ray diffraction spectroscopy, scanning electron microscopy, UV-visible absorption spectroscopy, and photoluminescence spectroscopy. Additionally, their photoelectrochemical properties were investigated by conducting three-electrode test and electrochemical impedance spectroscopy. Finally, their short-term and long-term electrochemical stability in acidic, alkaline, and neutral environments was studied. The results indicate that the synthesized materials are crystalline and nanostructured. The UV-visible absorption spectrum of zinc oxide exhibits a wider range, and its threshold voltage in the three-electrode test is closer to the theoretical value for water splitting; its photocurrent is higher in alkaline environments, while acidic conditions lead to corrosion and degradation. In contrast, the electrochemical impedance and recombination rate of electrons and holes in titanium dioxide are lower, resulting in a higher photocurrent and, consequently, increased efficiency; its photocurrent is greater in acidic conditions, with no corrosion observed. Ultimately, the chemical stability of titanium dioxide was assessed to be better than that of zinc oxide.
Keywords: Water splitting, photoelectrochemical properties, solar hydrogen, electrochemical stability
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