Journal
CHEMSUSCHEM
Volume 10, Issue 22, Pages 4650-4656Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201700943
Keywords
charge transfer; doping; hydrogen evolution; photocatalysis; quantum dots
Funding
- Ministry of Science and Technology of China [2014CB239402, 2013CB834505]
- National Key Projects for Fundamental Research and Development of China [2016YFB0600900, 2017YFA0206904, 2017YFA0206900]
- National Natural Science Foundation of China [U1662118, 51572270, 21401207]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17030300]
- Beijing Natural Science Foundation [2152033]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- National Program for Support of Top-Notch Young Professionals
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Carbon quantum dots (CQDs) have attracted widespread interest for photocatalytic applications, owing to their low cost and excellent electron donor/acceptor properties. However, their advancement as visible-light photosensitizers in CQDs/semiconductor nanocomposites is currently impaired by their poor quantum yields (QYs). Herein, we describe the successful fabrication of a series of nitrogen-doped CQDs (NCDs) with N/C atomic ratios ranging from 0.14-0.30. NCDs with the highest N-doping level afforded a remarkable external QY of 66.8% at 360 nm, and outstanding electron transfer properties and photosensitization efficiencies when physically adsorbed on P25 TiO2. A NCDs/P25-TiO2 hybrid demonstrated excellent performance for hydrogen evolution in aqueous methanol under both UV and visible-light illumination relative to pristine P25 TiO2. Controlled nitrogen doping of CQDs therefore represents a very effective strategy for optimizing the performance of CQDs/semiconductor hybrid photocatalysts.
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