Origin of the enhanced visible-light photocatalytic activity of CNT modified g-C3N4 for H2 production.
Phys Chem Chem Phys
; 16(17): 8106-13, 2014 May 07.
Article
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| ID: mdl-24654000
ABSTRACT
Graphitic carbon nitride (g-C3N4) hybridized with a small number of multi-walled carbon nanotubes (CNT) was synthesized using cyanamide as precursor. The optimal CNT content is found to be â¼0.2 wt% in the composite, which displays a 2.4-fold enhancement in photocatalytic water splitting over pure g-C3N4. Characterizations by a series of joint techniques including Raman spectra, UV/vis diffuse reflectance spectra, steady and time-resolved fluorescence emission spectra, and photocurrent responses were carried out, aiming to reveal the determinative factor for the improved visible-light response. Our results indicate that the increased photoactivity originates from the enhanced charge-transfer effect due to the intimate interactions between g-C3N4 and conjugated CNT. The presence of CNT in the hybrids is beneficial for improving electron-hole separation on the excited g-C3N4 by prolonging the lifetimes of charge carriers and improving the population distribution of short-lived and long-lived charge carriers.
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MEDLINE
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En
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Phys Chem Chem Phys
Asunto de la revista:
BIOFISICA
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QUIMICA
Año:
2014
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Article