Mesoporous layer-by-layer ordered nanohybrids of layered double hydroxide and layered metal oxide: Highly active visible light photocatalysts with improved chemical stability

Jayavant L. Gunjakar, Tae Woo Kim, Hyo Na Kim, In Young Kim, Seong Ju Hwang

Research output: Contribution to journalArticle

326 Citations (Scopus)

Abstract

Mesoporous layer-by-layer ordered nanohybrids highly active for visible light-induced O 2 generation are synthesized by self-assembly between oppositely charged 2D nanosheets of Zn-Cr-layered double hydroxide (Zn-Cr-LDH) and layered titanium oxide. The layer-by-layer ordering of two kinds of 2D nanosheets is evidenced by powder X-ray diffraction and cross-sectional high resolution-transmission electron microscopy. Upon the interstratification process, the original in-plane atomic arrangements and electronic structures of the component nanosheets remain intact. The obtained heterolayered nanohybrids show a strong absorption of visible light and a remarkably depressed photoluminescence signal, indicating an effective electronic coupling between the two component nanosheets. The self-assembly between 2D inorganic nanosheets leads to the formation of highly porous stacking structure, whose porosity is controllable by changing the ratio of layered titanate/Zn-Cr-LDH. The resultant heterolayered nanohybrids are fairly active for visible light-induced O 2 generation with a rate of ∼1.18 mmol h -1 g -1, which is higher than the O 2 production rate (∼0.67 mmol h -1 g -1) by the pristine Zn-Cr-LDH material, that is, one of the most effective visible light photocatalysts for O 2 production, under the same experimental condition. This result highlights an excellent functionality of the Zn-Cr-LDH-layered titanate nanohybrids as efficient visible light active photocatalysts. Of prime interest is that the chemical stability of the Zn-Cr-LDH is significantly improved upon the hybridization, a result of the protection of the LDH lattice by highly stable titanate layer. The present findings clearly demonstrate that the layer-by-layer-ordered assembly between inorganic 2D nanosheets is quite effective not only in improving the photocatalytic activity of the component semiconductors but also in synthesizing novel porous LDH-based hybrid materials with improved chemical stability.

Original languageEnglish
Pages (from-to)14998-15007
Number of pages10
JournalJournal of the American Chemical Society
Volume133
Issue number38
DOIs
Publication statusPublished - 2011 Sep 28

Fingerprint

Nanosheets
Chemical stability
Photocatalysts
Oxides
Metals
Light
Self assembly
Semiconductors
Porosity
Crystal atomic structure
Transmission Electron Microscopy
X-Ray Diffraction
Titanium oxides
Powders
Hybrid materials
High resolution transmission electron microscopy
X ray powder diffraction
Electronic structure
hydroxide ion
Photoluminescence

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Mesoporous layer-by-layer ordered nanohybrids of layered double hydroxide and layered metal oxide: Highly active visible light photocatalysts with improved chemical stability",
abstract = "Mesoporous layer-by-layer ordered nanohybrids highly active for visible light-induced O 2 generation are synthesized by self-assembly between oppositely charged 2D nanosheets of Zn-Cr-layered double hydroxide (Zn-Cr-LDH) and layered titanium oxide. The layer-by-layer ordering of two kinds of 2D nanosheets is evidenced by powder X-ray diffraction and cross-sectional high resolution-transmission electron microscopy. Upon the interstratification process, the original in-plane atomic arrangements and electronic structures of the component nanosheets remain intact. The obtained heterolayered nanohybrids show a strong absorption of visible light and a remarkably depressed photoluminescence signal, indicating an effective electronic coupling between the two component nanosheets. The self-assembly between 2D inorganic nanosheets leads to the formation of highly porous stacking structure, whose porosity is controllable by changing the ratio of layered titanate/Zn-Cr-LDH. The resultant heterolayered nanohybrids are fairly active for visible light-induced O 2 generation with a rate of ∼1.18 mmol h -1 g -1, which is higher than the O 2 production rate (∼0.67 mmol h -1 g -1) by the pristine Zn-Cr-LDH material, that is, one of the most effective visible light photocatalysts for O 2 production, under the same experimental condition. This result highlights an excellent functionality of the Zn-Cr-LDH-layered titanate nanohybrids as efficient visible light active photocatalysts. Of prime interest is that the chemical stability of the Zn-Cr-LDH is significantly improved upon the hybridization, a result of the protection of the LDH lattice by highly stable titanate layer. The present findings clearly demonstrate that the layer-by-layer-ordered assembly between inorganic 2D nanosheets is quite effective not only in improving the photocatalytic activity of the component semiconductors but also in synthesizing novel porous LDH-based hybrid materials with improved chemical stability.",
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Mesoporous layer-by-layer ordered nanohybrids of layered double hydroxide and layered metal oxide : Highly active visible light photocatalysts with improved chemical stability. / Gunjakar, Jayavant L.; Kim, Tae Woo; Kim, Hyo Na; Kim, In Young; Hwang, Seong Ju.

In: Journal of the American Chemical Society, Vol. 133, No. 38, 28.09.2011, p. 14998-15007.

Research output: Contribution to journalArticle

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AU - Gunjakar, Jayavant L.

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