Nowadays, conjugated polymers have garnered numerous attention as a new class of organic photocatalysts due to their tunable electronic properties, low cost, excellent stability and sufficient light-absorption performance. In particular, pyrene-benzothiadiazole-based conjugated polymer (PBBP) has been considered to be a new type of conjugated polymers for photocatalytic H2 evolution. However, the poor charge separation seriously limits its practical application in H2 evolution. In this work, a PBBP-based polymer/CdS 2D/2D organic/inorganic S-scheme heterojunction photocatalyst with a strong internal elec-tric field is, for the first time, prepared for efficient photocatalytic hydrogen evolution. The pyrene-benzothiadiazole-based conjugated polymers (PBBP) are synthesized by the Su-zuki-Miyaura reactions. Then, the hybrid heterojunction photocatalysts are fabricated by coupling CdS with it through the ultrasonic mixing method. As a result, the highest H2-pro-duction rate of 15.83 mmol h-1 g-1 is achieved on 20％ PBBP/CdS composite under visible-light irradiation, nearly 2.7 times higher than that of pure CdS. The apparent quantum efficiency (AQE) of 20％ PBBP/CdS composite could reach 8.66％ at λ = 420 nm. The enhanced activity could be attributed to the construction of S-scheme heterojunction, which accelerates the recombination of carriers with weaker redox ability and maintains the strong reducibility of electrons in CdS. This work provides a protocol for pyrene-benzothiadiazole-based conjugated polymers to prepare S-scheme heterojunction photocatalysts based on organic/inorganic coupling.

Ruiqi Gao;Huan He;Junxian Bai;Lei Hao;Rongchen Shen;Peng Zhang;Youji Li;Xin Li

Institute of Biomass Engineering,Key Laboratory of Energy Plants Resource and Utilization,Ministry of Agriculture and Rural Affairs,South China Agricultural University,Guangzhou 510642,China;State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM),School of Materials Science and Engi-neering,Zhengzhou University,Zhengzhou 450001,China;College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan,China

结构化学

[1]Ruiqi Gao;Huan He;Junxian Bai;Lei Hao;Rongchen Shen;Peng Zhang;Youji Li;Xin Li-.Pyrene-benzothiadiazole-based Polymer/CdS 2D/2D Organic/Inor-ganic Hybrid S-scheme Heterojunction for Efficient Photocatalytic H2 Evolution)[J].结构化学,2022(06):31-38,中插25-中插31

benzothiadiazole,Inor,PBBP,zuki

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