Journal
NANO RESEARCH
Volume 8, Issue 11, Pages 3621-3629Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-015-0862-3
Keywords
photocatalysis; Z-scheme; semiconductor; band structure; water splitting
Categories
Funding
- National Basic Research Program of China (973 Program) [2014CB848900]
- National Natural Science Foundation of China (NSFC) [21471141, 21473166]
- Recruitment Program of Global Experts, Hundred Talent Program of CAS
- Fundamental Research Funds for the Central Universities [WK2060190025, WK2310000035, WK2090050027]
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A Z-scheme is a promising approach to achieve broad-spectrum photocatalysis. Integration of TiO2 with another semiconductor with a band gap of similar to 1.0 eV would be ideal to harvest both ultraviolet and visible-near infrared light for photocatalysis; however, most narrow-bandgap semiconductors have straddling band structure alignments with TiO2, constituting an obstacle to forming the Z-scheme for photocatalytic hydrogen production. In this communication, we demonstrate Ag2S as a model system where the energy band upshift of the narrow-bandgap semiconductor that shares an interface with a metal can overcome this limitation. To fabricate the design, we developed a unique approach to synthesize Ag2S-Ag-TiO2 hybrid structures. The obtained ternary hybrid structures exhibited dramatically enhanced performance in photocatalytic hydrogen production under full-spectrum light illumination. The activities were significantly higher than the sum of those of Ag2S-Ag-TiO2 structures under lambda < 400 nm and lambda > 400 nm irradiation as well as those of their counterparts under any light illumination conditions.
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