In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Vol. 10, No. 4 ( 2023), p. 1153-1163
Kurzfassung:
Ultrathin black TiO 2 nanosheet-assembled microspheres with the advantages of both high specific surface area and broad optical absorption are promising photocatalysts, which, however, also suffer from the problem of low thermal stability. Herein, ultrathin black TiO 2 nanosheet-assembled microspheres are prepared with high-thermal stability using small amine molecules as protective agents to efficiently reduce the aggregation of TiO 2 nanosheets during the high-temperature hydrogenation. The resultant black TiO 2 nanosheet-assembled microspheres retain the anatase crystal phase and possess a relatively large specific surface area of 140.5 m 2 g −1 . After the hydrogenation treatment, surface Ti 3+ and bulk oxygen vacancies (O v ) are constructed, inducing a narrow bandgap of 2.89 eV to expand the photoresponse from the ultraviolet to the visible-light region. The black TiO 2 nanosheet-assembled microspheres exhibited an excellent solar-driven photocatalytic hydrogen evolution rate (6.54 mmol h −1 g −1 ), which is almost three times that of pristine TiO 2 nanosheet-assembled microspheres (1.94 mmol h −1 g −1 ) under AM 1.5 irradiation. The improved hydrogen evolution performance is ascribed to the high specific surface area and efficient hydrogenation, which increase sunlight utilization, provide abundant surface active sites and thus significantly improve the separation efficiency of photogenerated charges. The stable ultrathin black TiO 2 nanosheet structure has wide applications in visible photocatalysis and is also an excellent host for the construction of heterojunction composites.
Materialart:
Online-Ressource
ISSN:
2052-1553
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2023
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