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Synthesis and Photocatalytic Activity of Poly(triazine imide)

Authors

  • Yeilin Ham,

    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
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  • Dr. Kazuhiko Maeda,

    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
    2. Precursory Research for Embryonic Science and Technology (PRESTO) (Japan), Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi Saitama 332-0012 (Japan)
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  • Dr. Dongkyu Cha,

    1. Advanced Nanofabrication, Imaging and Characterization, Laboratory, King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900 (Saudi Arabia)
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  • Dr. Kazuhiro Takanabe,

    1. Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900 (Saudi Arabia)
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  • Prof. Dr. Kazunari Domen

    Corresponding author
    1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838
    • Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan), Fax: (+81) 3-5841-8838

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Abstract

Poly(triazine imide) was synthesized with incorporation of Li+ and Cl ions (PTI/Li+Cl) to form a carbon nitride derivative. The synthesis of this material by the temperature-induced condensation of dicyandiamide was examined both in a eutectic mixture of LiCl–KCl and without KCl. On the basis of X-ray diffraction measurements of the synthesized materials, we suggest that a stoichiometric amount of LiCl is necessary to obtain the PTI/Li+Cl phase without requiring the presence of KCl at 873 K. PTI/Li+Cl with modification by either Pt or CoOx as cocatalyst photocatalytically produced H2 or O2, respectively, from water. The production of H2 or O2 from water indicates that the valence and conduction bands of PTI/Li+Cl were properly located to achieve overall water splitting. The treatment of PTI/Li+Cl with [Pt(NH3)4]2+ cations enabled the deposition of Pt through ion exchange, demonstrating photocatalytic activity for H2 evolution, while treatment with [PtCl6]2− anions resulted in no Pt deposition. This was most likely because of the preferential exchange between Li+ ions and [Pt(NH3)4]2+ cations.

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