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Intercalative Hybridization of Layered Double Hydroxide Nanocrystal with Mesoporous g-C3N4 for Enhancing Visible Light-Induced H2 Production Efficiency

Abstract

Efficient visible light active hybrid photocatalyst for H2 production can be synthesized by the intercalative hybridization of Zn–Cr-layered double hydroxide (Zn–Cr-LDH) with mesoporous g-C3N4 lattice. Small Zn–Cr-LDH nanocrystals with the size of ~6 nm are immobilized in the mesopores of g-C3N4. Beyond an optimal LDH/g-C3N4 molar ratio of 0.3, a further increase of LDH content leads to the surface-deposition of LDH crystals on the g-C3N4 material as well as the intercalative immobilization of LDH into its mesopores, indicating the controllability of LDH deposition site. The Zn–Cr-LDH–g-C3N4 nanohybrids exhibit smaller surface areas than does the pristine g-C3N4, confirming the intercalative stabilization of Zn–Cr-LDH nanocrystals in the mesopore of g-C3N4. The hybridization between Zn–Cr-LDH and g-C3N4 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-C3N4 nanohybrid exhibits promising photocatalytic activities for visible light-induced H2 production with the rate of 155.7 μmol g–1 h–1, which are much superior to that of the pristine g-C3N4 (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 mesopore is quite useful in improving the visible light active photocatalyst functionality of mesoporous carbon nitride.

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Publication details

The article was received on 15 Sep 2017, accepted on 07 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7DT03466K
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Intercalative Hybridization of Layered Double Hydroxide Nanocrystal with Mesoporous g-C3N4 for Enhancing Visible Light-Induced H2 Production Efficiency

    J. M. Lee, J. Yang, N. H. Kwon, Y. K. Jo, J. H. Choy and S. Hwang, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT03466K

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