TY - JOUR
T1 - Mesoporous layer-by-layer ordered nanohybrids of layered double hydroxide and layered metal oxide
T2 - Highly active visible light photocatalysts with improved chemical stability
AU - Gunjakar, Jayavant L.
AU - Kim, Tae Woo
AU - Kim, Hyo Na
AU - Kim, In Young
AU - Hwang, Seong Ju
PY - 2011/9/28
Y1 - 2011/9/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=80053091102&partnerID=8YFLogxK
U2 - 10.1021/ja203388r
DO - 10.1021/ja203388r
M3 - Article
C2 - 21861530
AN - SCOPUS:80053091102
SN - 0002-7863
VL - 133
SP - 14998
EP - 15007
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 38
ER -