Effect of Nitrogen Doping Level on the Performance of N‐Doped Carbon Quantum Dot/TiO<sub>2</sub> Composites for Photocatalytic Hydrogen Evolution
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- Run Shi
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Zi Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Huijun Yu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Lu Shang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Chao Zhou
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Geoffrey I. N. Waterhouse
- School of Chemical Sciences The University of Auckland Auckland 1142 New Zealand
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- Li‐Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
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- Tierui Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China
説明
<jats:title>Abstract</jats:title><jats:p>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<jats:sub>2</jats:sub>. A NCDs/P25‐TiO<jats:sub>2</jats:sub> hybrid demonstrated excellent performance for hydrogen evolution in aqueous methanol under both UV and visible‐light illumination relative to pristine P25 TiO<jats:sub>2</jats:sub>. Controlled nitrogen doping of CQDs therefore represents a very effective strategy for optimizing the performance of CQDs/semiconductor hybrid photocatalysts.</jats:p>
収録刊行物
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- ChemSusChem
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ChemSusChem 10 (22), 4650-4656, 2017-07-31
Wiley