Crystalline carbon nitride anchored on MXene as an ordered Schottky heterojunction photocatalyst for enhanced visible-light hydrogen evolution
| Autor: | Shimin Wang, Li Zhao, Juan Wang, Congcong Wu, Jin Li, Guohong Wang, Zuhong Li, Liwei Cai, Jinmao Li, Zezhu Zhou, Hong Tang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Heptazine Schottky diode Heterojunction 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound chemistry Chemical engineering law Photocatalysis General Materials Science Crystallization 0210 nano-technology Carbon nitride Visible spectrum |
| Zdroj: | Carbon. 179:387-399 |
| ISSN: | 0008-6223 |
| Popis: | Carbon nitride (CN) polymer is considered as a potential material for photocatalysis, but surfers from the low photoconversion efficiency due to its high defect density. Although the defects can be limited through the crystallization of CN, the photocatalytic activity of single-component photocatalyst is still restricted by the recombination of photoexcited carriers. In our work, the ordered Schottky heterojunction of heptazine-based crystalline carbon nitride (HCN) and Ti3C2 MXene was successfully prepared through ionothermal method. The HCN/Ti3C2 composites exhibit higher photocatalytic performance than pristine HCN. Particularly, the HCNT20 sample exhibits the highest photocatalytic H2 evolution activity, which is about 8 and 2 times higher than that of bulk CN and pristine HCN, respectively. The results of charge transfer dynamics and DFT calculation reveal that the photocatalytic enhancement mechanism is primarily attributed to the synergistic effects of crystallization of CN, excellent conductivity of Ti3C2 and well-constructed Schottky heterojunction. |
| Databáze: | OpenAIRE |
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