Polymeric photocatalysts for hydrogen evolution by water splitting have drawn tremendous research interest in recent years. However, the relatively low photocatalytic hydrogen evolution efficiency still needs to be overcome for further development. Recently, a growing body of literature has shown that the sulfone group can act as an electron-output site owing to its strong electron-withdrawing ability. Therefore, this study reports a sulfide oxidation tuning approach in 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDTT) for constructing a series of sulfone-based dual acceptor_1-2 (A₁–A₂)-type copolymers with different numbers of sulfonyl groups and demonstrates that the A₁–A₂-type copolymer possesses the potential to supersede the D–A-type copolymer and A–A-type homopolymer. Moreover, the resulting polymer, PBDTTS-1SO displayed high photocatalytic activities of 97.1 mmol h⁻¹ g⁻¹ and 473 μmol h⁻¹ (6 mg) under visible-light illumination and an apparent quantum yield exceeding 18% at a wavelength of 500 nm, which seems to be the highest value recorded among the reported polymer photocatalysts to date. This study presents an alternative material design strategy to boost photocatalytic efficiency.

中文翻译：

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4,8-双(5-(2-乙基己基)噻吩-2-基)苯并[1,2-b:4,5-b']二噻吩基双受体共聚物中的硫化物氧化调节用于高效光催化析氢

近年来，高分子光催化剂通过水分解析氢引起了极大的研究兴趣。然而，相对较低的光催化析氢效率仍有待进一步发展。最近，越来越多的文献表明，砜基团具有很强的吸电子能力，可以作为电子输出位点。因此，本研究报告了 4,8-双(5-(2-乙基己基)噻吩-2-基)苯并[1,2- b :4,5- b ']二噻吩 (BDTT) 中的硫化物氧化调节方法构建了一系列具有不同数量磺酰基的砜基双受体_1-2 (A ₁ –A ₂ ) 型共聚物，并证明了 A₁ - A ₂型共聚物具有取代D-A 型共聚物和A-A 型均聚物的潜力。此外，所得聚合物 PBDTTS-1SO在可见光照射下^{表现出 97.1 mmol h -1} g ^-1和 473 μmol h ^-1 (6 mg) 的高光催化活性，并且在 500 波长处的表观量子产率超过 18% nm，这似乎是迄今为止报道的聚合物光催化剂中记录的最高值。本研究提出了一种提高光催化效率的替代材料设计策略。