Analysis of structural & optical properties as well as band alignment of ZnO/ TiO2 nanocomposite for PEC efficiency improvement

This study focuses on comparing pure titanium dioxide and its composite with zinc oxide to introduce a cost-effective, high-performance material for photoelectric applications. The desired nanomaterials, synthesized via the sol-gel method, were fabricated as thin layers using the inexpensive spin-coating technique. X-ray diffraction analysis and SEM micrographs confirmed the successful synthesis of spherical titanium dioxide nanostructures, which enhance light absorption. Furthermore, XPS investigations revealed that the formation of p-n junctions within the composite effectively improves charge separation and photoelectric efficiency, presenting a promising approach for the sustainable production of electrochemical devices and solar cells. Photoluminescence analysis demonstrated a decrease in intensity with the addition of ZnO, indicating reduced electron-hole recombination rates. Additionally, as an application for solar-driven water splitting, increased photocurrent and reduced onset voltage for hydrogen evolution were observed. In conclusion, the composite enhances light absorption and electron-hole separation processes, thereby increasing electron lifetime and overall efficiency.