Journal
APPLIED SURFACE SCIENCE
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.143537
Keywords
Dibenzothiophene-S,S-dioxide; Pyrene; Isomers; Photocatalysis; Hydrogen evolution
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Funding
- Natural Science Foundation of China [51103111]
- Education Ministry of China [NCET-12-0714]
- Educational Commission of Hubei Province of China [D20181505]
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Two analogous positional polymers P16PySO and P27PySO have been synthesized via the copolymerization from dibenzothiophene-S,S-dioxide and pyrene building blocks. The effect of the linking pattern on the molecular packing, photophysical and photocatalytic properties of the two isomers was investigated. It was interestingly found that a minor change at the substitution position of pyrene unit was demonstrated to largely influence the photocatalytic properties of the two isomers. P16PySO exhibited an encouraging average hydrogen evolution rate (HER) of 619.5 mu mol h(-1) and the maximum HER of 774 mu mol h(-1), much higher than that of 2,7-counterpart with a moderate rate of 282 mu mol h(-1). The increased photocatalytic activity of P16PySO is mainly ascribed to its more ordered molecular packing, broader absorption region, better wettability, and higher photo-generated charge mobilities. Moreover, the optimum HER was increased from 774 to 1013 mu mol h(-1) when the amount of the photocatalyst P16PySO was increased from 50 to 100 mg, which is among the top solar-to-hydrogen conversion efficiencies reported so far for the polymeric photocatalysts.
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