article · Applied Organometallic Chemistry
A wet-incipient impregnation method was used to prepare a composite photocatalyst combining bimetallic cobalt and zinc zeolitic imidazolate frameworks with titanium dioxide. The material was synthesised to produce green hydrogen through photocatalytic water splitting. It features a hierarchical porous architecture containing both micropores and mesopores, which establishes an efficient transport channel for charge transfer during the catalytic reaction. Under testing, the composite achieved a hydrogen generation rate of 13 millimoles per hour per gram, representing a 151-fold increase over the catalytic performance of unmodified titanium dioxide. The composite also delivered higher hydrogen production rates than standard framework heterostructures lacking cobalt. These results indicate that hierarchical porous metal-organic frameworks can effectively act as supports and promoters to enhance the photocatalytic activity of semiconductor materials.
Generating green hydrogen by splitting water with light is a promising pathway for producing clean energy. Standard semiconductors such as titanium dioxide often suffer from low efficiency when used alone. Integrating these semiconductors with porous metal-organic frameworks significantly boosts hydrogen production rates, providing useful design principles for developing higher-performing solar fuel catalysts.
This work could support the development of enhanced catalysts for green hydrogen production equipment. Likely users include industrial hydrogen developers and clean technology manufacturers seeking higher solar-to-fuel conversion rates. The abstract describes laboratory-scale synthesis and testing, placing this technology at an early stage of development that requires extensive scaling and operational validation before commercial use.
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A wet‐incipient impregnation method was reported to synthesize hierarchical porous bimetallic (Co, Zn)‐zeolitic imidazolate frameworks (ZIF‐8)/TiO 2 (Co@ZIF‐8/TiO 2 ) for green hydrogen generation via photocatalytic water splitting. Co@ZIF‐8/TiO 2 showed higher photocatalytic efficiency than TiO 2 , with a hydrogen generation rate (HGR) of 13 mmol·h −1 ·g −1 with a 151‐fold increase in the catalytic performance of TiO 2 . The photocatalytic HGR of Co@ZIF‐8/TiO 2 was superior to that of the ZIF‐8/TiO 2 heterostructure. Co@ZIF‐8 showed a hierarchical porous structure containing micropores and mesopores regimes, providing a proficient transport channel for charge transfer. This study presents new prospects for using hierarchical porous metal–organic frameworks (MOFs) as support and promoter in photocatalytic applications of semiconductor such as TiO 2 .
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DOI: 10.1002/aoc.6995
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