Cobalt-intercalated one-dimensional nanocrystals of urea perylene imide polymer for enhanced visible-light photocatalytic water oxidation

Urea perylene imide polymer (UPDI) is successfully recombined with Co(NO3)2 molecules into one-dimensional nanocrystals (Co−UPDI) for enhanced photocatalytic oxygen evolution (POE) under visible light. Co−UPDI as photocatalyst exhibits more an order of magnitude of POE rate than UPDI at pH = 4.8 (8....

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Published in:Applied catalysis. B, Environmental Environmental, 2022-07, Vol.309, p.121293, Article 121293
Main Authors: Cao, Aihui, Li, Renfu, Xu, Xiao, Huang, Weifeng, He, Ying, Li, Junqiang, Sun, Miao, Chen, Xueyuan, Kang, Longtian
Format: Article
Language:English
Subjects:
Cobalt
Cobaltous nitrate
Crystals
Excitons
Heterojunctions
Nanocrystals
One-dimensional nanocrystal
Oxidation
Photocatalysis
Polymers
Rigidity
Silver nitrate
Urea
Urea perylene imide
Ureas
Water oxidation
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Summary:Urea perylene imide polymer (UPDI) is successfully recombined with Co(NO3)2 molecules into one-dimensional nanocrystals (Co−UPDI) for enhanced photocatalytic oxygen evolution (POE) under visible light. Co−UPDI as photocatalyst exhibits more an order of magnitude of POE rate than UPDI at pH = 4.8 (8.00 vs. 0.58 mmol h−1g−1), which is the highest among reported POE tests in aqueous colloid system with AgNO3 as sacrificial agent. The apparent quantum yield (AQY) reaches 4.39 % at 450 nm. The systematical experiments reveals that the heterojunction formation between UPDI line and Co(NO3)2 molecules is crucial through the coordination of Co with N atoms. Consequently, the rigidity of UPDI line enhances, H−type stacking of PDI moiety becomes closer, and CoOOH as cocatalyst in-situ forms during POE. Meanwhile, more excitons with longer lifetime generate and more quickly transfer in Co−UPDI than UPDI nanocrystals. This work provides an efficient strategy for photocatalytic water oxidation. 1D nanocrystals (Co-UPDI) of Co(NO3)2 −intercalated UPDI polymer were synthesized for visible-light photocatalytic oxygen evolution (POE) in acid colloid system. Co−UPDI as catalyst exhibits more an order of magnitude of POE rate of UPDI (8.00 vs. 0.58 mmol h−1g−1) due to UPDI rigidity enhanced and in-situ formation of CoOOH as cocatalyst. [Display omitted] •1D nanocrystals of UPDI molecule line and Co(NO3)2 composite are successfully synthesized.•POE rate is raised by more an order of magnitude in Co−UPDI than UPDI (8.00 vs. 0.58 mmol h−1g−1).•Z-scheme heterojunction between UPDI and Co(NO3)2 forms due to the interaction of Co with N.•The rigidity of UPDI molecule line, especially at C−N site, enhances in Co−UPDI crystal.•The longer lifetime of charge transfer exciton is found in Co−UPDI than UPDI (100.1 vs. 2.3 ps).
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2022.121293