부산대학교 도서관

A highly morphological behavior is exhibited by the composite material consisting of silver iodide (AgI) and polypyrrole intercalated with iodide ions (P1HP-I) within the polymer chains. This material is synthesized in two sequential steps: first, by polymerizing pyrrole using iodine, and then by conducting a double replacement reaction with silver nitrate (AgNO3). These processes result in the formation of AgI/P1HP composite with iodide ions found in two distinct locations: within the AgI structure and intercalated within the polymer chains. These positions have been confirmed through X-ray photoelectron spectroscopy (XPS) analyses. The resulting AgI/P1HP-I composite demonstrates a wide response to photons across a broad optical spectrum, which can be attributed to its enhanced bandgap of 2.64 eV. This material is subsequently employed as a photocathode for the production of hydrogen gas from Red Sea water, with a heavy metal serving as a sacrificial agent for generating H2 gas. In tests conducted under both illuminated and dark conditions, the photocathode exhibits a current density (Jph) of 0.23 and 0.34 eV, respectively. Furthermore, when testing the material with monochromatic wavelengths ranging from 340 to 730 nm, the best performance is observed at 340 nm, generating a current of 0.32 mA/cm² and producing 2.4 µmol/cm²/h of hydrogen gas. This AgI/P1HP-I composite, developed through cost-effective, environmentally friendly, and straightforward preparation methods, shows great promise as a photocathode for hydrogen gas generation. It presents a viable solution for industrial applications in the field. [ABSTRACT FROM AUTHOR]