Noble metal-free zeolitic imidazolate framework-based composite for photocatalytic production of green hydrogenIqbal, Muhammad Umer (Avtor) Rana, Surjyakanta (Avtor) Zitnan, Michal (Avtor) Ashling, Christopher W. (Avtor) Pérez-Ramos, M. (Avtor) Nadeem, Irfan (Avtor) González-Rodríguez, Modesto (Avtor) Galusek, Dušan (Avtor) Núñez, Pedro (Avtor) Wondraczek, Lothar (Avtor) Velazquez, José Joaquín (Avtor) CuWO4compositesgreen hydrogen productionwater splittingZIF-8Photocatalytic water splitting could become a major pillar in addressing future demands for carbon-free energy supply. To develop noble-metal-free photocatalyst microstructures, a heterostructure photocatalytic system containing hexagonal Zeolitic Imidazolate Framework-8 (ZIF-8) and oxygen-deficient spherical CuWO▫$_{4}$▫ nanoparticles was designed. In addition to preventing CuWO▫$_{4}$▫ aggregation, ZIF-8 promotes the accessibility of active sites, interfacial charge transfer, and separation in the ZIF-8@CuWO▫$_{4}$▫ composite. In this composite, UV-visible diffuse reflectance spectroscopy reveals substantial light absorption in the UV range, while photoluminescence spectroscopy indicates suppressed electron-hole recombination relative to pristine materials. The as-synthesised ZIF-8@CuWO▫$_{4}$▫ exhibits a photocatalytic H▫$_{2}$▫ evolution rate of 2,531 μmol g▫$^{-1}$▫ h▫$^{-1}$▫ under UV irradiation, higher than that of pristine ZIF-8 and CuWO▫$_{4}$▫. The composite achieves a maximum H▫$_{2}$▫ production rate of 79 μmol g▫$^{-1}$▫ h▫$^{-1}$▫ under visible light irradiation using Na▫$_{2}$▫S/Na▫$_{2}$▫SO▫$_{3}$▫ (0.35/0.25 M) as the sacrificial hole scavenger. These results highlight that integrating ZIF-8 with CuWO▫$_{4}$▫ could offer an effective option for improving photocatalytic green hydrogen production in CuWO▫$_{4}$▫-based heterojunction systems.20262026-08-20 13:46:52Članek v reviji185801sl