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  Advancing n→π* Electron Transition of Carbon Nitride Nanotubes for H2 Photosynthesis

Zhang, G., Savateev, A., Zhao, Y., Li, L., & Antonietti, M. (2017). Advancing n→π* Electron Transition of Carbon Nitride Nanotubes for H2 Photosynthesis. Journal of Materials Chemistry A, 5(25), 12723-12728. doi:10.1039/C7TA03777E.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-537B-B Version Permalink: http://hdl.handle.net/21.11116/0000-0000-4F93-2
Genre: Journal Article

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 Creators:
Zhang, Guigang1, Author              
Savateev, Aleksandr1, Author              
Zhao, Yubao1, Author              
Li, Lina1, Author              
Antonietti, Markus2, Author              
Affiliations:
1Aleksandr Savateev, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2421702              
2Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863321              

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Free keywords: Open Access
 Abstract: Melon-based carbon nitride (g-C3N4) is a promising metal-free and sustainable material for photocatalytic water splitting. In principle, pristine carbon nitride only exhibits moderate activity due to the insuficient visible light absorption and fast charge recombination. To enhance the solar-to-energy efficiency of g-C3N4, it depends on the rational design of the morphology and electronic structure. Herein, we report on self-assembly of g-C3N4 nanotubes by co-polycondensation of urea and oxamide with their similar structure and reactivity to optimize the texture and electronic properties. Unlike pristine g-C3N4, the obtained copolymers exhibit clear optical absorption above 465 nm, which is ascribed from the n[rightward arrow][small pi]* electron transition involving lone pairs of the edge nitrogen atoms of the heptazine units. Besides, the charge carrier mobility was also optimized in the spatially seperated nanotube structure, which is contributed to generate more hot electrons. The optimized copolymers show dramatically enhanced H2 evolution activities especially with green light. The achieved apparent quantum yield (AQY) of optimal CN-OA-0.05 for H2 evolution with green LED ([small lambda] = 525 nm) reaches 1.3 %, which is about 10 times higher than that of pure CN with state-of-the-art activity in this wavelength region.

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 Dates: 2017-05-242017
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/C7TA03777E
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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 5 (25) Sequence Number: - Start / End Page: 12723 - 12728 Identifier: ISSN: 2050-7488