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In-situ growth of CdS quantum dots on g-C3N4 nanosheets for highly efficient photocatalytic hydrogen generation under visible light irradiation |
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| Authors: | Shao-Wen Cao Yu-Peng Yuan Jun Fang Mohammad Mehdi Shahjamali Freddy YC Boey James Barber Say Chye Joachim Loo Can Xue |
| Affiliation: | 1. Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;2. Laboratory of Advanced Porous Materials, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, PR China;3. Division of Molecular Biosciences, Imperial College London, South Kensington Campus, London SW7 2AZ, UK |
| Abstract: | Well dispersed CdS quantum dots were successfully grown in-situ on g-C3N4 nanosheets through a solvothermal method involving dimethyl sulfoxide. The resultant CdS–C3N4 nanocomposites exhibit remarkably higher efficiency for photocatalytic hydrogen evolution under visible light irradiation as compared to pure g-C3N4. The optimal composite with 12 wt% CdS showed a hydrogen evolution rate of 4.494 mmol h−1 g−1, which is more than 115 times higher than that of pure g-C3N4. The enhanced photocatalytic activity induced by the in-situ grown CdS quantum dots is attributed to the interfacial transfer of photogenerated electrons and holes between g-C3N4 and CdS, which leads to effective charge separation on both parts. |
| Keywords: | Solar fuels Hydrogen production Water splitting Carbon nitride Photocatalyst Charge transfer |
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