Pyridyl anchoring squaraine as a near-infrared dye sensitizer for effective sensitized hydrogen production over a titanium dioxide photocatalyst in water medium
Pyridyl anchoring squaraine as a near-infrared dye sensitizer for effective sensitized hydrogen production over a titanium dioxide photocatalyst in water medium
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DOI：
10.1007/s00339-022-06281-7
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Xiaoli Shen;Motonori Watanabe;Atsushi Takagaki;J. Song;Tatsuki Abe;D. Kawaguchi;Keiji Tanaka;
中科院分区：
文献类型：
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作者：
Xiaoli Shen;Motonori Watanabe;Atsushi Takagaki;J. Song;Tatsuki Abe;D. Kawaguchi;Keiji Tanaka;
方碱染料是一种在近红外区域具有强而窄的吸收特性的有机染料，广泛应用于光伏和生物医学领域。本文合成了方碱染料（SA1）作为染料敏化剂，用于由SA1和负载pt的tio2粉末光催化剂（SA1/Pt-TiO2）组成的染料敏化光催化体系。在800 nm单色光照射下，a1 / pt - tio2体系在150 h内表现出良好的产氢性能，表观量子产率为1.4%。然而，在光催化反应过程中，sa1 / pt - tio2的光催化活性由于光分解而降低。采用紫外-可见吸收光谱、1H核磁共振光谱、基质辅助激光解吸/电离飞行时间质谱等方法研究了sa1中方碱部分的分解机理、分解过程以及分解后物质的结构。结果表明，即使没有负载pt的tio2粉末光催化剂，sa1也会发生光解作用，导致吲哚部分与方酸之间的键断裂。图形抽象
Squaraine dyes are organic dyes having strong and narrow absorption properties in the near-infrared region that are widely used in photovoltaic and biomedical applications. In this work, squaraine dye (SA1) was synthesized as a dye sensitizer for a dye-sensitized photocatalytic system, which was composed ofSA1and Pt-loaded TiO2powder photocatalyst (SA1/Pt-TiO2). TheSA1/Pt-TiO2system exhibited a good hydrogen production performance within 150 h and an apparent quantum yield of 1.4% under 800 nm monochromatic light irradiation. However, during the photocatalytic reaction, the photocatalytic activity ofSA1/Pt-TiO2decreased due to photodecomposition. Ultraviolet–visible absorption spectroscopy,1H nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry measurements were performed to investigate the mechanism of the decomposition of the squaraine moiety ofSA1, the decomposition process, and the structure of the decomposed material. The results show that even without the Pt-loaded TiO2powder photocatalyst,SA1undergoes photodissociation, which cleaves the bond between the indoline moiety and the square acid.Graphical abstract