4.7 Article

Novel organically linked ZnII hydrogenselenite coordination polymers: synthesis, characterization, and efficient TiO2 photosensitization for enhanced photocatalytic hydrogen production

Journal

DALTON TRANSACTIONS
Volume 52, Issue 45, Pages 16841-16848

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d3dt03094f

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This study synthesized two novel coordination polymers and immobilized them onto TiO2 for photocatalytic hydrogen production. Among them, compound 1 exhibited promising catalytic activity and was considered as a promising TiO2 photosensitizer.
This study focused on the solvothermal synthesis, characterization, and photocatalytic activities of two novel coordination polymers, namely [Zn(mu-HSeO3)(2)(bipy)](n) (1) and [Zn(mu-HSeO3)(2)(phen)](n) (2). These compounds represent the first organically linked Zn-II hydrogenselenite coordination polymers. The synthesis of compounds 1 and 2 involved the addition of 2,2 '-bipyridine and 1,10-phenanthroline, respectively, to SeO2 and ZnO in methanol as the solvent. The novel hydrogenselenite compounds were thoroughly characterized using spectroscopic and crystallographic methods. The photocatalytic solids (TiO2-1A and TiO2-2A) were prepared by immobilizing compounds 1-2 onto TiO2 through the sol-gel approach. These photocatalysts were then evaluated for hydrogen evolution via water splitting using a 300 W Hg/Xe lamp as the irradiation source. Among the newly synthesized photocatalytic materials, TiO2-1A demonstrated auspicious photocatalytic performance for hydrogen gas production. Its catalytic activity overcame the observed for the pure solid support TiO2 and Degussa P25 (commercial titania), making compound 1 a particularly attractive TiO2 photosensitizer. Additionally, TiO2-1A exhibited superior photocatalytic activity compared to TiO2-2A. The latter performed better than freshly prepared TiO2, approaching that of Degussa P25. These findings highlight the potential of compound 1 as an effective photosensitizer for TiO2-based photocatalysis, making it a promising candidate for applications in clean energy generation, specifically in hydrogen production by water splitting.

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