Ligand Removal from CdS Quantum Dots for Enhanced Photocatalytic H2 Generation in pH Neutral Water
Chang, Christina M
Martindale, Benjamin CM
Journal of Materials Chemistry A
Royal Society of Chemistry
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Chang, C. M., Orchard, K., Martindale, B. C., & Reisner, E. (2015). Ligand Removal from CdS Quantum Dots for Enhanced Photocatalytic H2 Generation in pH Neutral Water. Journal of Materials Chemistry A https://doi.org/10.1039/C5TA04136H
Ligand-free CdS quantum dots were produced by a reactive ligand stripping procedure and employed for photocatalytic H2 evolution in pH neutral solution. The rate of H2 generation of the ‘bare’ quantum dots was 175 times higher than that of the equivalent mercaptopropionic acid-capped quantum dots in the presence of a cobalt co-catalyst and Na2SO3 as sacrificial electron donor. Under optimised conditions, a turnover number of 58,000 mol H2 per mol Co and 29,000 mol H2 per mol CdS quantum dots was achieved after 88 h of continuous solar light irradiation (λ > 420 nm, 1 sun intensity). Ligand removal is therefore a potent method to substantially enhance the photocatalytic performance of quantum dot systems.
We gratefully acknowledge the following funding sources: The Marshall Aid Commemoration Commission (CMC), the Advanced Institute for Materials Research-‐Cambridge Joint Research Centre (KLO), the Ernest Oppenheimer Fund, Cambridge (BCMM), and the EPSRC (EP/H00338X/2; ER).
External DOI: https://doi.org/10.1039/C5TA04136H
This record's URL: https://www.repository.cam.ac.uk/handle/1810/248768
Licence URL: http://creativecommons.org/licenses/by/4.0/
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