Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 23, Pages 11710-11719Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta10541f
Keywords
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Funding
- JSPS [JP16H06441]
- Photon and Quantum Basic Research Coordinated Development Program (MEXT, Japan)
- Noguchi Institute
- Hosokawa Powder Technology Foundation
- PRESTO/JST program Chemical Conversion of Light Energy
- [JP16H06130]
- [JP15K14220]
- Grants-in-Aid for Scientific Research [26102014, 15K14220, 16H06441, 16H00852, 16H06130, 16H04188, 15H00890] Funding Source: KAKEN
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A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O-2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2: Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O-2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2: N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H-2 and O-2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2: Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (lambda > 420 nm) and under AM 1.5G simulated sunlight.
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