Two-dimensional g-C^sub 3^N^sub 4^/Ca^sub 2^Nb^sub 2^TaO^sub 10^ nanosheet composites for efficient visible light photocatalytic hydrogen evolution

Scalable g-C3N4 nanosheet powder catalyst was prepared by pyrolysis of dicyandiamide and ammonium chloride followed by ultra-sonication and freeze-drying. Nanosheet composite that combines the g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets with various ratios were developed and applied as photocatalys...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2017-03, Vol.202, p.184
Main Authors: Thaweesak, Supphasin, Lyu, Miaoqiang, Peerakiatkhajohn, Piangjai, Butburee, Teera, Luo, Bin, Chen, Hongjun, Wang, Lianzhou
Format: Article
Language:English
Subjects:
Abundance
Ammonium
Ammonium chloride
Catalysts
Catalytic activity
Charge transfer
Chlorides
Composite materials
Evolution
Freeze drying
Hydrogen
Hydrogen evolution
Irradiation
Kinetics
Luminescence
Nanomaterials
Nanosheets
Photocatalysis
Photoluminescence
Photons
Powder
Pyrolysis
Radiation
Reaction kinetics
Recombination
Sonication
Synergistic effect
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Summary:Scalable g-C3N4 nanosheet powder catalyst was prepared by pyrolysis of dicyandiamide and ammonium chloride followed by ultra-sonication and freeze-drying. Nanosheet composite that combines the g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets with various ratios were developed and applied as photocatalysts for solar hydrogen generation. Systematic studies reveal that the g-C3N4/Ca2Nb2TaO10 nanosheet composite with a mass ratio of 80:20 shows the best performance in photocatalytic H2 evolution under visible light-irradiation, which is more than 2.8 times out-performing bare g-C3N4 bulk. The resulting nanosheets possess a high surface area of 96 m2/g, which provides abundance active sites for the photocatalytic activity. More importantly, the g-C3N4/Ca2Nb2TaO10 nanosheet composite shows efficient charge transfer kinetics at its interface, as evident by the photoluminescence measurement. The intimate interfacial connections and the synergistic effect between g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets with cascading electrons are efficient in suppressing charge recombination and improving photocatalytic H2 evolution performance.
ISSN:0926-3373
1873-3883