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Boosting photocatalytic hydrogen evolution rate over carbon nitride through tuning its crystallinity and its nitrogen composition

Author:
Zhuge, Gui-Ying, Zhang, Wei-De
Source:
Journal of colloid and interface science 2019 v.555 pp. 268-275
ISSN:
0021-9797
Subject:
absorption, carbon nitride, crystal structure, energy, graphene, hydrogen production, light, lighting, nanosheets, nitrogen, photocatalysis, solvents
Abstract:
The photocatalytic activity of graphitic carbon nitride (CN) is mainly restricted by its high recombination rate of charge carriers and narrow visible light absorption. In the present work, nitrogen-deficient CN (NDCCN) nanosheets with high crystallinity were synthesized using molten salt (NaLiCO3) as an etching agent and high-temperature solvent. The electronic structure and energy band levels of the obtained NDCCN are optimized to extend its optical absorption and enhance separation efficiency of photo-generated charge carriers. With these changes, NDCCN displays high photocatalytic activity for hydrogen evolution under visible light illumination (111 μmol h−1), which is 4.6 times of that over pristine CN. This finding opens up a new window to simultaneously decrease nitrogen composition and increase crystallinity of carbon nitride for higher solar-light-driven hydrogen production efficiency.
Agid:
6552296