Graphitic C2N3: An Allotrope of g-C3N4 Containing Active Azide Pentagons as Metal-Free Photocatalyst for Abundant H2 Bubble Evolution
| Autor: | Shaoqing Song, Dongmei Tang, Shujuan Jiang, Chuanzhi Sun, Chengtian Shao |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Field (physics) General Engineering General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Polypyrrole Photochemistry 01 natural sciences Cycloaddition 0104 chemical sciences chemistry.chemical_compound chemistry Polymerization Electric field Photocatalysis General Materials Science Azide 0210 nano-technology Triazine |
| Zdroj: | ACS Nano. 15:7208-7215 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.1c00477 |
| Popis: | A g-C3N4 allotrope, a curved leaf-like graphitic C2N3 (g-C2N3) with an intrinsic spontaneous polarization electric field (ISPEF), has been constructed for efficient solar energy conversion into H2 energy via photocatalytic H2O splitting. The curved leaf-like π-delocalization g-C2N3 was composed of aromatic azide pentagons and normal triazine hexagons obtained by cycloaddition between -C≡N groups from dicyandiamide polymerization and azide from the heat-treated polypyrrole fibers. Under light irradiation (λ > 420 nm), photo-generated charges are driven to separate efficiently and transfer from bulk to active sites of the surface under ISPEF that is opposite to the Coulomb field. Consequently, without any cocatalyst, g-C3N4 allotrope demonstrates a very high H2-production activity of 14.9 mmol g-1 h-1 accompanied by a lot of H2 bubbles, which is 2.6 times of g-C3N4 loading with Pt. In comparison with the reported metal-free photocatalysts or those supported with noble metals, g-C3N4 allotrope (i.e., leaf-like g-C2N3) is confirmed to be the best metal-free photocatalyst for H2O splitting into H2 fuel so far. The contructed leaf-like g-C2N3 with SPEF supplies a suitable platform for solar energy conversion into H2 fuel, which actively contributes to clean energy production. |
| Databáze: | OpenAIRE |
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