Large-scale production of ultrathin carbon nitride-based photocatalysts for high-yield hydrogen evolution
[Display omitted] •A "subtractive" manufacturing method for mass-production of ultrathin carbon nitride is developed.•The large-scale synthesized catalyst shows high quantum efficiency arriving 50.65 % and 14.75 % at 405 nm and 420 nm.•The origin of high catalytic efficiency is discussed a...
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Published in | Applied catalysis. B, Environmental Vol. 281; p. 119475 |
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Main Authors | , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.02.2021
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•A "subtractive" manufacturing method for mass-production of ultrathin carbon nitride is developed.•The large-scale synthesized catalyst shows high quantum efficiency arriving 50.65 % and 14.75 % at 405 nm and 420 nm.•The origin of high catalytic efficiency is discussed and revealed.
Although two-dimensional graphitic carbon nitride (2D g-C3N4) and corresponding heterostructures have been widely synthesized for photocatalysis, it is still challenging to obtain 2D g-C3N4 at large-scale and also achieve high quantum efficiency. Here we report a subtractive manufacturing method mediated by Nb2O5 to mass-produce high quality Nb2O5/2D g-C3N4 and pure 2D g-C3N4. Nb2O5/2D g-C3N4 and 2D g-C3N4 both show efficient photocatalytic hydrogen evolution performance, in which the optimal Nb2O5/2D g-C3N4 exhibits high external quantum efficiency (50.65 % and 14.75 % at 405 nm and 420 nm). The origin of the high efficiency can be ascribed to two aspects: (i) nanostructure engineering forming 2D structure can shorten the charge migration distance; (ii) Nb2O5/2D g-C3N4 with strong electric coupling can further accelerate the charge transfer driven by the built-in electric field formed in Type II heterostructure. This work presents a case study to realize high-yield synthesis and high catalytic performance simultaneously over g-C3N4. |
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ISSN: | 0926-3373 1873-3883 |
DOI: | 10.1016/j.apcatb.2020.119475 |