An Artificial Z-Scheme Constructed from Dye-Sensitized Metal Oxide Nanosheets for Visible Light-Driven Overall Water Splitting
- Tokyo Inst. of Technology, Tokyo (Japan); Japan Society for the Promotion of Science, Tokyo (Japan)
- Tokyo Inst. of Technology, Tokyo (Japan); Japan Society for the Promotion of Science, Tokyo (Japan); Univ. of Pennsylvania, Philadelphia, PA (United States)
- Niigata Univ., Niigata (Japan)
- Tokyo Inst. of Technology, Tokyo (Japan)
- National Inst. for Materials Science, Tsukuba (Japan). Research Centre for Advanced Measurement and Characterization
- National Inst. for Materials Science, Tsukuba (Japan). Research Centre for Functional Materials
- National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Research Centre for Photovoltaics (RCPV)
- Tokyo Institute of Technology (Japan). Inst. of Innovative Research
- Univ. of Pennsylvania, Philadelphia, PA (United States); National Inst. for Materials Science (NIMS), Tsukuba (Japan). International Centre for Materials Nanoarchitectonics (WPI-MANA)
Sensitization of a wide-gap oxide semiconductor with a visible-light-absorbing dye has been studied for decades as a means of producing H2 from water. However, efficient overall water splitting using a dye-sensitized oxide photocatalyst has remained an unmet challenge. Here in this paper we demonstrate visible-light-driven overall water splitting into H2 and O2 using HCa2Nb3O10 nanosheets sensitized by a Ru(II) tris-diimine type photosensitizer, in combination with a WO3-based water oxidation photocatalyst and a triiodide/iodide redox couple. With the use of Pt-intercalated HCa2Nb3O10 nanosheets further modified with amorphous Al2O3 clusters as the H2 evolution component, the dye-based turnover number and frequency for H2 evolution reached 4580 and 1960 h–1, respectively. The apparent quantum yield for overall water splitting using 420 nm light was 2.4%, by far the highest among dye- sensitized overall water splitting systems reported to date. The present work clearly shows that a carefully designed dye/oxide hybrid has great potential for photocatalytic H2 production, and represents a significant leap forward in the development of solar-driven water splitting systems.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0019781
- OSTI ID:
- 1614807
- Journal Information:
- Journal of the American Chemical Society, Vol. 142, Issue 18; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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