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- W4287637354 abstract "Black TiO2 with/without noble metal has been proposed for visible photocatalyst, still leaving poor catalyst efficiency. Alternatively, phase-mixed TiO2 such as anatase and rutile has been commonly used for visible catalysts with the inevitable inclusion of noble metal. Here, we perform a noble metal-free visible photocatalyst blue TiO2 with type-II band-aligned ordered anatase/disordered rutile structure, via phase-selective reduction with alkali metals. The changed band alignment in this heterostructure was identified by absorption and ultraviolet photoemission spectroscopy, which was further confirmed by transient charge separation. The band alignment of type-I and type-II was clearly restructured by converting from ordered to disordered phase with a prolonged reduction period and as followed light absorbance enhancement also observed. Initiated type-I in a pristine sample, the type-II was organized from disordered rutile phase in 3-day Li-reduction. The type-II disordered rutile TiO2 heterostructure exhibits a remarkable photocatalytic performance by 55 times higher than conventional P25 TiO2 in solar-light driven hydrogen evolution reaction owing to an efficient electron and hole separation of type-II heterojunction. Furthermore, this restructured heterojunction type-II TiO2 demanded 10 times less Pt amount as a co-catalyst for the comparable photocatalytic performance, compared to Pt decorated type-I pristine anatase/rutile phase-mixed TiO2." @default.
- W4287637354 created "2022-07-25" @default.
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- W4287637354 date "2020-10-19" @default.
- W4287637354 modified "2023-10-16" @default.
- W4287637354 title "Band restructuring of ordered/disordered blue TiO2 for visible photocatalyst" @default.
- W4287637354 doi "https://doi.org/10.48550/arxiv.2010.09328" @default.
- W4287637354 hasPublicationYear "2020" @default.
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