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Title: Metal-free organic sensitizers for use in water-splitting dye-sensitized photoelectrochemical cells

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [1];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3]
  1. Departments of aChemistry and
  2. Department of Chemistry and Biochemistry and Center for Bio-Inspired Solar Fuel Production, Arizona State University, Tempe, AZ 85287
  3. Departments of aChemistry and, Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802, and

Solar fuel generation requires the efficient capture and conversion of visible light. In both natural and artificial systems, molecular sensitizers can be tuned to capture, convert, and transfer visible light energy. We demonstrate that a series of metal-free porphyrins can drive photoelectrochemical water splitting under broadband and red light (λ > 590 nm) illumination in a dye-sensitized TiO2 solar cell. Here, we report the synthesis, spectral, and electrochemical properties of the sensitizers. Despite slow recombination of photoinjected electrons with oxidized porphyrins, photocurrents are low because of low injection yields and slow electron self-exchange between oxidized porphyrins. As a result, the free-base porphyrins are stable under conditions of water photoelectrolysis and in some cases photovoltages in excess of 1 V are observed.

Research Organization:
Arizona State Univ., Tempe, AZ (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Solar Fuel Production (BISfuel)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER15911; SC0001016; DGE1255832; ECS-0335765
OSTI ID:
1235499
Alternate ID(s):
OSTI ID: 1348410
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 112 Journal Issue: 6; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 127 works
Citation information provided by
Web of Science

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  • Youngblood, W. Justin; Lee, Seung-Hyun Anna; Kobayashi, Yoji
  • Journal of the American Chemical Society, Vol. 131, Issue 3, p. 926-927 https://doi.org/10.1021/ja809108y
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