Boosting Dual Photocatalytic Activity of Hydrogen Production and Selective Coupling of Benzyl Alcohol Using Assembled Poly(ionic liquid)s and CdS Quantum Dots
Issued Date
2025-01-01
Resource Type
ISSN
18645631
eISSN
1864564X
Scopus ID
2-s2.0-105000453529
Journal Title
ChemSusChem
Rights Holder(s)
SCOPUS
Bibliographic Citation
ChemSusChem (2025)
Suggested Citation
Rumporee S., Boonta W., Watwiangkham A., Sudyoadsuk T., Chakarawet K., Vinayavekhin N., Fujii S., Butburee T., Suthirakun S., Unruangsri J. Boosting Dual Photocatalytic Activity of Hydrogen Production and Selective Coupling of Benzyl Alcohol Using Assembled Poly(ionic liquid)s and CdS Quantum Dots. ChemSusChem (2025). doi:10.1002/cssc.202402328 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/108626
Title
Boosting Dual Photocatalytic Activity of Hydrogen Production and Selective Coupling of Benzyl Alcohol Using Assembled Poly(ionic liquid)s and CdS Quantum Dots
Corresponding Author(s)
Other Contributor(s)
Abstract
Dual photocatalysis converts renewable solar energy into clean fuel and concomitantly value-added chemical synthesis through hydrogen generation and selective organic transformation, using semiconductor catalysts. The catalytic activity of solitary component semiconductor photocatalysts is impeded by their inefficient charge separation and transfer. We, herein, present a facile method, electrostatic assembly, to create hybrid photocatalysts that consist of CdS quantum dots and non-conjugated poly(ionic liquid)s including poly(diallyl dimethyl ammonium bromide) (P(DADMA)) and poly(1-ethyl-3-vinylimidazolium bromide) (P(VEIM)). Poly(ionic liquid)s acted as electron donors to CdS, resulting in an increase in charge separation and transportation in CdS/P(DADMA) and CdS/P(VEIM) hybrids, as demonstrated by experimental and computational results. The optimal photocatalysis of benzyl alcohol (BA) in water was achieved by CdS/P(DADMA) under 12 h LED370 illumination in a nitrogen-atmosphere. This process produced 12.8 mmol gcat−1 h−1 of H2 and 12.5 mmol gcat−1 h−1 of racemic hydrobenzoin (HB) with 99 % selectivity. In photocatalysis, CdS/P(DADMA) outperformed CdS/P(VEIM) and CdS by a significant margin. Our photocatalytic system enabled the BA-to-HB conversion in water, of which the reaction is commonly sluggish due to a mass transfer constraint. The insightful DFT calculation confirmed that poly(ionic liquid)s may stabilize active intermediate species in the process, significantly enhancing photogenerated charge expedition and photocatalytic performance.