K–Na co-doping in crystalline polymeric carbon nitride for highly improved photocatalytic hydrogen evolution
| Autor: | Chenxi Li, Jun Zhou, Zhu Shu, Wenbing Wang, Lulu Shi, Tiantian Li, Zhengliang Zhao, Lingling Feng, Zihao Liao, Lina Xu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Heptazine Renewable Energy Sustainability and the Environment Doping Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Fuel Technology Chemical engineering chemistry law Photocatalysis Calcination 0210 nano-technology Imide Carbon nitride Visible spectrum |
| Zdroj: | International Journal of Hydrogen Energy. 46:26318-26328 |
| ISSN: | 0360-3199 |
| Popis: | Integrated modification of polymeric carbon nitride (PCN) by crystallinity-improving and multi-element-doping was realized to advance the photocatalytic activity of PCN in this work. Specifically, K–Na co-doped crystalline PCN (K–Na–CCN) was facilely synthesized by calcining melon with NaCl and subsequent with KOH solution. It owned well-defined poly (heptazine imide) framework doped with both Na+ and K+. K–Na–CCN realized enhanced visible light absorption and reduced recombination of photogenerated electron-hole pairs, leading to favorable photocatalytic hydrogen evolution activity much superior to the melon-based bulk PCN and Na-doped crystalline PCN. The co-doping of K+ and Na+ in the crystalline carbon nitride framework was highlighted for this improvement. This work owns reference significance to the microstructure optimization of crystalline PCN. |
| Databáze: | OpenAIRE |
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