Noble metal-free zeolitic imidazolate framework-based composite for photocatalytic production of green hydrogen

Iqbal, 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)

Photocatalytic 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.

• Jezik: Angleški jezik
• Ključne besede: CuWO4, composites, green hydrogen production, water splitting, ZIF-8
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 23 str.
• Številčenje: Vol. 6, art. 20260107
• PID: 20.500.12556/RUL-185801
• UDK: 544.526.5:678.061
• ISSN pri članku: 2770-2995
• DOI: 10.20517/microstructures.2026.58
• COBISS.SI-ID: 288336899
• Datum objave v RUL: 20.08.2026

Gradivo je del revije

• Naslov: Microstructures
• Skrajšan naslov: Microstructures
• Založnik: OAE Publishing Inc.
• ISSN: 2770-2995
• COBISS.SI-ID: 142678787

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: CuWO4, kompoziti, proizvodnja zelenega vodika, razcep vode, ZIF-8