Journal
SMALL
Volume 16, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202001024
Keywords
CdS quantum dots; photocatalytic hydrogen production; Schottky heterojunctions; Sn cocatalysts; Sn ions
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Funding
- National Key Research and Development Program of China [2018YFB1502001]
- NSFC [21871025, 51932007, 51961135303, 21905219, 21871217, U1905215, U1705251]
- National Postdoctoral Program for Innovative Talents [BX20180231]
- Recruitment Program of Global Experts (Young Talents)
- BIT Excellent Young Scholars Research Funds
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Herein, oil-soluble CdS quantum dots (QDs) are first prepared through a solvent-thermal process. Then, oil-soluble CdS QDs are changed into water-soluble QDs via ligand exchange using mercaptopropionic acid as capping agent at pH 13. The photocatalytic performance is investigated under the visible light irradiation using glycerol as sacrificial agent and Sn2+ as cocatalyst. No H-2-production activity is observed for oil-soluble CdS QDs. Water-soluble CdS QDs exhibit significantly enhanced hydrogen evolution rate. When the concentration of cocatalyst Sn2+ increases to 0.2 x 10(-3) m, the rate of hydrogen evolution reaches 1.61 mmol g(-1) h(-1), which is 24 times higher than that of the pristine water-soluble CdS QDs. The enhanced H-2-production efficiency is attributed to the adsorption of Sn2+ ions on the surface of CdS QDs that are further reduced to Sn atoms by photogenerated electrons. The in situ generated Sn atoms serve as photocatalytic cocatalyst for efficient hydrogen generation.
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