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Intercalative hybridization of layered double hydroxide nanocrystals with mesoporous g-C 3 N 4 for enhancing visible light-induced H 2 production efficiency.
Dalton Transactions : An International Journal of Inorganic Chemistry 2018 Februrary 28
Efficient visible light active hybrid photocatalysts for H2 production can be synthesized by the intercalative hybridization of Zn-Cr-layered double hydroxide (Zn-Cr-LDH) with a mesoporous g-C3 N4 lattice. Small Zn-Cr-LDH nanocrystals with a size of ∼6 nm are immobilized in the mesopores of g-C3 N4 . Beyond an optimal LDH/g-C3 N4 molar ratio of 0.3, a further increase in the LDH content leads to the surface deposition of LDH crystals on the g-C3 N4 material as well as the intercalative immobilization of LDH into its mesopores, indicating the controllability of the LDH deposition site. The Zn-Cr-LDH-g-C3 N4 nanohybrids exhibit smaller surface areas than the pristine g-C3 N4 , confirming the intercalative stabilization of Zn-Cr-LDH nanocrystals in the mesopore of g-C3 N4 . The hybridization between Zn-Cr-LDH and g-C3 N4 is effective in enhancing visible light absorptivity and also in depressing electron-hole recombination, which is attributable to an efficient electronic coupling between both the hybridized components. The present Zn-Cr-LDH-g-C3 N4 nanohybrid exhibits promising photocatalytic activities for visible light-induced H2 production at a rate of 155.7 μmol g-1 h-1 , which is much superior to that of the pristine g-C3 N4 (21.7 μmol g-1 h-1 ). The present study underscores that the intercalative immobilization of Zn-Cr-LDH crystals in the limited space of a mesopore is quite useful in improving the visible light active photocatalyst functionality of mesoporous carbon nitride.
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