Hot-electron-assisted S-scheme heterojunction of tungsten oxide/graphitic carbon nitride for broad-spectrum photocatalytic H2 generation
| Autor: | Hua Tang, Xudong He, Xiaohui Yu, Jun Zhang, Jinjun Peng, Qinqin Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Range (particle radiation)
Materials science business.industry Nanowire Graphitic carbon nitride Heterojunction 02 engineering and technology General Medicine 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Photocatalysis Optoelectronics 0210 nano-technology business Plasmon |
| Zdroj: | Chinese Journal of Catalysis. 42:1478-1487 |
| ISSN: | 1872-2067 |
| DOI: | 10.1016/s1872-2067(20)63753-6 |
| Popis: | Extended light absorption and dynamic charge separation are vital factors that determine the effectiveness of photocatalysts. In this study, a nonmetallic plasmonic S-scheme photocatalyst was fabricated by loading 1D plasmonic W18O49 nanowires onto 2D g-C3N4 nanosheets. W18O49 nanowires play the dual role of a light absorption antenna—that extends light adsorption—and a hot electron donor—that assists the water reduction reaction in a wider light spectrum range. Moreover, S-scheme charge transfer resulting from the matching bandgaps of W18O49 and g-C3N4 can lead to strong redox capability and high migration speed of the photoinduced charges. Consequently, in this study, W18O49/g-C3N4 hybrids exhibited higher photocatalytic H2 generation than that of pristine g-C3N4 under light irradiation of 420–550 nm. Furthermore, the H2 production rate of the best-performing W18O49/g-C3N4 hybrid was 41.5 μmol·g−1·h−1 upon exposure to monochromatic light at 550 nm, whereas pure g-C3N4 showed negligible activity. This study promotes novel and environmentally friendly hot-electron-assisted S-scheme photocatalysts for the broad-spectrum utilization of solar light. |
| Databáze: | OpenAIRE |
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