Defect Engineering of Ultrasmall TiO<sub>2</sub> Nanoparticles Enables Highly Efficient Photocatalysts for Solar H<sub>2</sub> Production from Woody Biomass.
basic_science · Level V
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- Record sourced from PubMed, PMID 39259027.
- Also identified by DOI 10.1021/acs.nanolett.4c03361.
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Abstract
The conversion of woody biomass to H<sub>2</sub> through photocatalysis provides a sustainable strategy to generate renewable hydrogen fuel but was limited by the slow decomposition rate of woody biomass. Here, we fabricate ultrasmall TiO<sub>2</sub> nanoparticles with tunable concentration of oxygen vacancy defects (V<sub>O</sub>-TiO<sub>2</sub>) as highly efficient photocatalysts for photocatalytic conversion of woody biomass to H<sub>2</sub>. Owing to the positive role of oxygen vacancy in reducing energy barrier for the generation of <sup>•</sup>OH which was the critical species to oxidize woody biomass, the obtained V<sub>O</sub>-TiO<sub>2</sub> achieves rapid photocatalytic conversion of α-cellulose and poplar wood chip to H<sub>2</sub> in the presence of Pt nanoclusters as the cocatalyst. As expected, the highest H<sub>2</sub> generation rate in α-cellulose and poplar wood chip system respectively achieve 1146 and 59 μmol h<sup>-1</sup> g<sup>-1</sup>, and an apparent quantum yield of 4.89% at 380 nm was obtained in α-cellulose aqueous solution.