Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 255, Issue -, Pages -Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2019.117770
Keywords
g-C(3)N(4)graphdiyne; Hydrogen generation; Photocatalysis
Funding
- National Key Research and Development Program of China [2018YFB1502001]
- NSFC [U1705251, 21573170, 21433007, 21871217]
- SKLWUT [2017-ZD-4]
- EdUHK [04725]
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Hydrogen is considered an ideal alternative energy source to replace fossil energy. Herein, a novel graphdiyne (GD)/graphitic carbon nitride (g-C3N4) nanocomposite was successfully synthesized via a facile calcination approach, and display excellent H-2-generation performance under visible light. When the mass ratio of GD reaches 0.5 wt% in GD/g-C3N4 nanocomposite, it shows a maximum hydrogen evolution rate, exceeding that of g-C3N4 by 6.7-fold. After systematic characterization, a new C-N bond is confirmed to form between GD and g-C3N4 following heat treatment, and this bond serves as a charge carrier channel that facilitates the migration of photogenerated electrons from g-C3N4 to GD. Positive effects, such as a prolonged photogenerated charge carrier lifetime, intensified electron density, decreased reaction overpotential and improved charge carrier mobility, also contribute to the enhanced photocatalytic performance of the nanocomposites. The proposed technique provides a promising approach for modifying photocatalysts in future applications.
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