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Title: An Artificial Z-Scheme Constructed from Dye-Sensitized Metal Oxide Nanosheets for Visible Light-Driven Overall Water Splitting

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c02053· OSTI ID:1614807
 [1]; ORCiD logo [2];  [3];  [4];  [5]; ORCiD logo [6]; ORCiD logo [7];  [3]; ORCiD logo [8];  [5]; ORCiD logo [7]; ORCiD logo [4]; ORCiD logo [9]; ORCiD logo [4]
  1. Tokyo Inst. of Technology, Tokyo (Japan); Japan Society for the Promotion of Science, Tokyo (Japan)
  2. Tokyo Inst. of Technology, Tokyo (Japan); Japan Society for the Promotion of Science, Tokyo (Japan); Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. Niigata Univ., Niigata (Japan)
  4. Tokyo Inst. of Technology, Tokyo (Japan)
  5. National Inst. for Materials Science, Tsukuba (Japan). Research Centre for Advanced Measurement and Characterization
  6. National Inst. for Materials Science, Tsukuba (Japan). Research Centre for Functional Materials
  7. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Research Centre for Photovoltaics (RCPV)
  8. Tokyo Institute of Technology (Japan). Inst. of Innovative Research
  9. 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
Citation Metrics:
Cited by: 88 works
Citation information provided by
Web of Science

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