Highly crystalline Na0.5Bi0.5TiO3 of a photocatalyst valence-band-controlled with Bi(iii) for solar water splitting

Na0.5Bi0.5TiO3 (BG 3.1 eV) with a valence band formed by Bi(iii) was found as a new photocatalyst for solar water splitting. The water splitting activity of highly crystalline Na0.5Bi0.5TiO3 synthesized by a flux method was much higher than that of the samples synthesized by a solid-state reaction....

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Bibliographic Details
Published in:Chemical communications (Cambridge, England) England), 2021-01, Vol.57 (3), p.323-326
Main Authors: Watanabe, Kenta, Iikubo, Yoichi, Yamaguchi, Yuichi, Kudo, Akihiko
Format: Article
Language:English
Subjects:
Bismuth titanate
Crystal structure
Crystallinity
Energy conversion efficiency
Hydrogen-based energy
Photocatalysts
Photoexcitation
Valence band
Water splitting
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Summary:Na0.5Bi0.5TiO3 (BG 3.1 eV) with a valence band formed by Bi(iii) was found as a new photocatalyst for solar water splitting. The water splitting activity of highly crystalline Na0.5Bi0.5TiO3 synthesized by a flux method was much higher than that of the samples synthesized by a solid-state reaction. The optimized RhCr2Ox(0.1 mol%)/Na0.5Bi0.5TiO3/CoOOH(0.02 mol%) gave a 5.1% apparent quantum yield at 350 nm and split water even under simulated sunlight irradiation with a 0.05% solar to hydrogen energy conversion efficiency. We have successfully achieved solar water splitting using a one-step photoexcitation type photocatalyst valence-band-controlled with Bi(iii).
ISSN:1359-7345
1364-548X
DOI:10.1039/d0cc07371g