Enhanced photocatalytic generation of hydrogen by Pt-deposited nitrogen-doped TiO2 hierarchical nanostructures
- Enhanced photocatalytic generation of hydrogen by Pt-deposited nitrogen-doped TiO2 hierarchical nanostructures
- Brundabana Naik; 문송이; 김상훈; 박정영
- H2 generation; Photocatalysis; Hot electron; Hierarchical; Macro-meso-micro porosity
- Issue Date
- Applied surface science
- VOL 354, 347-352
- We report the photocatalytic activity of hydrogen generation on Pt nanoparticles deposited on hier-archically porous N-doped TiO2nanostructures (Pt-NHPT). The photocatalysts are composed of Ptnanoparticles well dispersed throughout hierarchical macroporous TiO2fibrous channels. The intersti-tial N doping extends light absorption toward the visible region. We found that the porosity of N-dopedTiO2nanostructures can be tuned using different annealing temperatures. While Pt-NHPT catalysts cal-cined at 300◦C (Pt-NHPT-300) have both macro- and mesoporosity, Pt-NHPT catalysts calcined at 800◦C(Pt-NHPT-800) exhibit only macroporosity. We found that Pt-NHPT-300 shows a two-fold higher H2evolution activity than that of Pt-NHPT-800, and 30% higher activity than undoped hierarchical catalysts(Pt-HPT-300). The enhanced photoactivity is attributed to the synergistic effects of N doping, hierarchicalporosity, and charge transfer between the TiO2nanostructures and the Pt co-catalyst.
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