Near‐Infrared Light‐Driven Hydrogen Evolution from Water Using a Polypyridyl Triruthenium Photosensitizer |
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| Authors: | Yutaro Tsuji Keiya Yamamoto Dr. Kosei Yamauchi Prof. Ken Sakai |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Kyushu University, Nishi-ku, Fukuoka, Japan;2. International Institute for Carbon-Neutral Energy Research, WPI-I2CNER, Kyushu University, Japan;3. Center for Molecular Systems, CMS, Kyushu, University, Japan |
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| Abstract: | In order to realize artificial photosynthetic devices for splitting water to H2 and O2 (2 H2O+hν→2 H2+O2), it is desirable to use a wider wavelength range of light that extends to a lower energy region of the solar spectrum. Here we report a triruthenium photosensitizer [Ru3(dmbpy)6(μ‐HAT)]6+ (dmbpy=4,4′‐dimethyl‐2,2′‐bipyridine, HAT=1,4,5,8,9,12‐hexaazatriphenylene), which absorbs near‐infrared light up to 800 nm based on its metal‐to‐ligand charge transfer (1MLCT) transition. Importantly, [Ru3(dmbpy)6(μ‐HAT)]6+ is found to be the first example of a photosensitizer which can drive H2 evolution under the illumination of near‐infrared light above 700 nm. The electrochemical and photochemical studies reveal that the reductive quenching within the ion‐pair adducts of [Ru3(dmbpy)6(μ‐HAT)]6+ and ascorbate anions affords a singly reduced form of [Ru3(dmbpy)6(μ‐HAT)]6+, which is used as a reducing equivalent in the subsequent water reduction process. |
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| Keywords: | artificial photosynthesis near-infrared light photosensitizers ruthenium water splitting |
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