Han Changzhi, Dong Peihua, Tang Haoran, Zheng Peiyun, Zhang Chong, Wang Feng, Huang Fei, Jiang Jia-Xing
Key Laboratory for Macromolecular Science of Shaanxi Province, Shaanxi Engineering Laboratory for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University Xi'an Shaanxi 710062 P. R. China
Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou 510641 China.
Chem Sci. 2020 Dec 8;12(5):1796-1802. doi: 10.1039/d0sc05866a.
The design and synthesis of conjugated semiconducting polymers for photocatalytic hydrogen evolution have engendered intense recent interest. However, most reported organic polymer photocatalysts show a relatively broad band gap with weak light absorption ability in the visible light region, which commonly leads to a low photocatalytic activity under visible light. Herein, we synthesize three novel dithieno[3,2-:2',3'-]thiophene-,-dioxide (DTDO) containing conjugated polymer photocatalysts by a facile C-H arylation coupling polymerization reaction. The resulting polymers show a broad visible light absorption range up to 700 nm and a narrow band gap down to 1.81 eV due to the introduction of the DTDO unit. Benefiting from the donor-acceptor polymer structure and the high content of the DTDO unit, the three-dimensional polymer without the addition of a Pt co-catalyst shows an attractive photocatalytic hydrogen evolution rate of 16.32 mmol h g under visible light irradiation, which is much higher than that of most reported organic polymer photocatalysts under visible light.
用于光催化析氢的共轭半导体聚合物的设计与合成近来引起了人们的浓厚兴趣。然而，大多数报道的有机聚合物光催化剂显示出相对较宽的带隙，在可见光区域的光吸收能力较弱，这通常导致在可见光下光催化活性较低。在此，我们通过简便的C-H芳基化偶联聚合反应合成了三种新型的含二噻吩并[3,2-b:2',3'-d]噻吩-2,6-二氧化物（DTDO）的共轭聚合物光催化剂。由于引入了DTDO单元，所得聚合物显示出高达700 nm的宽可见光吸收范围和低至1.81 eV的窄带隙。受益于供体-受体聚合物结构和高含量的DTDO单元，在不添加Pt助催化剂的情况下，这种三维聚合物在可见光照射下显示出16.32 mmol h-1 g-1的诱人光催化析氢速率，这远高于大多数报道的有机聚合物光催化剂在可见光下的析氢速率。
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