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Effect of Nitrogen Doping Level on the Performance of N-Doped Carbon Quantum Dot/TiO 2 Composites for Photocatalytic Hydrogen Evolution.
- Source :
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ChemSusChem [ChemSusChem] 2017 Nov 23; Vol. 10 (22), pp. 4650-4656. Date of Electronic Publication: 2017 Jul 31. - Publication Year :
- 2017
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Abstract
- 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 TiO <subscript>2</subscript> . A NCDs/P25-TiO <subscript>2</subscript> hybrid demonstrated excellent performance for hydrogen evolution in aqueous methanol under both UV and visible-light illumination relative to pristine P25 TiO <subscript>2</subscript> . Controlled nitrogen doping of CQDs therefore represents a very effective strategy for optimizing the performance of CQDs/semiconductor hybrid photocatalysts.<br /> (© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1864-564X
- Volume :
- 10
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- ChemSusChem
- Publication Type :
- Academic Journal
- Accession number :
- 28671326
- Full Text :
- https://doi.org/10.1002/cssc.201700943