Photoredox Cascade Catalyst for Efficient Hydrogen Production with Biomass Photoreforming.
Angew Chem Int Ed Engl
; 62(46): e202313014, 2023 Nov 13.
Article
em En
| MEDLINE
| ID: mdl-37735096
ABSTRACT
Biomass photoreforming is a promising method to provide both a clean energy resource in the form of hydrogen (H2 ) and valuable chemicals as the results of water reduction and biomass oxidation. To overcome the poor contact between heterogeneous photocatalysts and biomass substrates, we fabricated a new photoredox cascade catalyst by combining a homogeneous catalyst, 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO), and a heterogeneous dual-dye sensitized photocatalyst (DDSP) composed of two Ru(II)-polypyridine photosensitizers (RuP6 and RuCP6 ) and Pt-loaded TiO2 nanoparticles. During blue-light irradiation (λ=460±15â
nm; 80â
mW), the DDSP photocatalytically reduced aqueous protons to form H2 and simultaneously oxidized TEMPO⢠radicals to generate catalytically active TEMPO+ . It oxidized biomass substrates (water-soluble glycerol and insoluble cellulose) to regenerate TEMPO⢠. In the presence of N-methyl imidazole as a proton transfer mediator, the photocatalytic H2 production activities for glycerol and cellulose reforming reached 2670 and 1590â
µmol H2 (gTiO2 )-1 â
h-1 , respectively, which were comparable to those of state-of-the-art heterogeneous photocatalysts.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article