A Crucial Role of Rh Substituent Ion in Photoinduced Internal Electron Transfer and Enhanced Photocatalytic Activity of CdS-Ti(5.2-x)/6Rhx/2O2 Nanohybrids

Jang Mee Lee, Hyung Bin Jin, In Young Kim, Yun Kyung Jo, Jung Wook Hwang, Kang Kyun Wang, Min Gyu Kim, Yong Rok Kim, Seong Ju Hwang

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The photocatalytic activity and photostability of CdS quantum dot (QD) can be remarkably enhanced by hybridization with Rh-substituted layered titanate nanosheet even at very low Rh substitution rate (<1%). Mesoporous CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids are synthesized by a self-assembly of exfoliated Ti(5.2-x)/6Rhx/2O2 nanosheets with CdS QDs. The partial substitution of Rh3+/Rh4+ ions for Ti4+ ions in layered titanate is quite effective in enhancing an electronic coupling between hybridized CdS and titanate components via the formation of interband Rh 4d states. A crucial role of Rh substituent ion in the internal electron transfer is obviously evidenced from in situ X-ray absorption spectroscopy showing the elongation of (RhO) bond under visible light irradiation. This is the first spectroscopic evidence for the important role of substituent ion in the photoinduced electron transfer of hybrid-type photocatalyst. The CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids show much higher photocatalytic activity for H2 production and better photostability than do CdS and unsubstituted CdS-TiO2 nanohybrid. This result is ascribable to the enhancement of visible light absorptivity, the depression of electron-hole recombination, and the enhanced hole curing of CdS upon Rh substitution. The present study underscores that the hybridization with composition-controlled inorganic nanosheet provides a novel efficient methodology to optimize the photo-related functionalities of semiconductor nanocrystal.

Original languageEnglish
Pages (from-to)5771-5780
Number of pages10
JournalSmall
Volume11
Issue number43
DOIs
Publication statusPublished - 2015 Nov 18

Fingerprint

Nanosheets
Electrons
Ions
Quantum Dots
Substitution reactions
X-Ray Absorption Spectroscopy
Light
X ray absorption spectroscopy
Photocatalysts
Nanocrystals
Self assembly
Genetic Recombination
Semiconductor quantum dots
Curing
Elongation
Irradiation
Semiconductor materials
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Cite this

Lee, Jang Mee ; Jin, Hyung Bin ; Kim, In Young ; Jo, Yun Kyung ; Hwang, Jung Wook ; Wang, Kang Kyun ; Kim, Min Gyu ; Kim, Yong Rok ; Hwang, Seong Ju. / A Crucial Role of Rh Substituent Ion in Photoinduced Internal Electron Transfer and Enhanced Photocatalytic Activity of CdS-Ti(5.2-x)/6Rhx/2O2 Nanohybrids. In: Small. 2015 ; Vol. 11, No. 43. pp. 5771-5780.
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abstract = "The photocatalytic activity and photostability of CdS quantum dot (QD) can be remarkably enhanced by hybridization with Rh-substituted layered titanate nanosheet even at very low Rh substitution rate (<1{\%}). Mesoporous CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids are synthesized by a self-assembly of exfoliated Ti(5.2-x)/6Rhx/2O2 nanosheets with CdS QDs. The partial substitution of Rh3+/Rh4+ ions for Ti4+ ions in layered titanate is quite effective in enhancing an electronic coupling between hybridized CdS and titanate components via the formation of interband Rh 4d states. A crucial role of Rh substituent ion in the internal electron transfer is obviously evidenced from in situ X-ray absorption spectroscopy showing the elongation of (RhO) bond under visible light irradiation. This is the first spectroscopic evidence for the important role of substituent ion in the photoinduced electron transfer of hybrid-type photocatalyst. The CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids show much higher photocatalytic activity for H2 production and better photostability than do CdS and unsubstituted CdS-TiO2 nanohybrid. This result is ascribable to the enhancement of visible light absorptivity, the depression of electron-hole recombination, and the enhanced hole curing of CdS upon Rh substitution. The present study underscores that the hybridization with composition-controlled inorganic nanosheet provides a novel efficient methodology to optimize the photo-related functionalities of semiconductor nanocrystal.",
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A Crucial Role of Rh Substituent Ion in Photoinduced Internal Electron Transfer and Enhanced Photocatalytic Activity of CdS-Ti(5.2-x)/6Rhx/2O2 Nanohybrids. / Lee, Jang Mee; Jin, Hyung Bin; Kim, In Young; Jo, Yun Kyung; Hwang, Jung Wook; Wang, Kang Kyun; Kim, Min Gyu; Kim, Yong Rok; Hwang, Seong Ju.

In: Small, Vol. 11, No. 43, 18.11.2015, p. 5771-5780.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A Crucial Role of Rh Substituent Ion in Photoinduced Internal Electron Transfer and Enhanced Photocatalytic Activity of CdS-Ti(5.2-x)/6Rhx/2O2 Nanohybrids

AU - Lee, Jang Mee

AU - Jin, Hyung Bin

AU - Kim, In Young

AU - Jo, Yun Kyung

AU - Hwang, Jung Wook

AU - Wang, Kang Kyun

AU - Kim, Min Gyu

AU - Kim, Yong Rok

AU - Hwang, Seong Ju

PY - 2015/11/18

Y1 - 2015/11/18

N2 - The photocatalytic activity and photostability of CdS quantum dot (QD) can be remarkably enhanced by hybridization with Rh-substituted layered titanate nanosheet even at very low Rh substitution rate (<1%). Mesoporous CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids are synthesized by a self-assembly of exfoliated Ti(5.2-x)/6Rhx/2O2 nanosheets with CdS QDs. The partial substitution of Rh3+/Rh4+ ions for Ti4+ ions in layered titanate is quite effective in enhancing an electronic coupling between hybridized CdS and titanate components via the formation of interband Rh 4d states. A crucial role of Rh substituent ion in the internal electron transfer is obviously evidenced from in situ X-ray absorption spectroscopy showing the elongation of (RhO) bond under visible light irradiation. This is the first spectroscopic evidence for the important role of substituent ion in the photoinduced electron transfer of hybrid-type photocatalyst. The CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids show much higher photocatalytic activity for H2 production and better photostability than do CdS and unsubstituted CdS-TiO2 nanohybrid. This result is ascribable to the enhancement of visible light absorptivity, the depression of electron-hole recombination, and the enhanced hole curing of CdS upon Rh substitution. The present study underscores that the hybridization with composition-controlled inorganic nanosheet provides a novel efficient methodology to optimize the photo-related functionalities of semiconductor nanocrystal.

AB - The photocatalytic activity and photostability of CdS quantum dot (QD) can be remarkably enhanced by hybridization with Rh-substituted layered titanate nanosheet even at very low Rh substitution rate (<1%). Mesoporous CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids are synthesized by a self-assembly of exfoliated Ti(5.2-x)/6Rhx/2O2 nanosheets with CdS QDs. The partial substitution of Rh3+/Rh4+ ions for Ti4+ ions in layered titanate is quite effective in enhancing an electronic coupling between hybridized CdS and titanate components via the formation of interband Rh 4d states. A crucial role of Rh substituent ion in the internal electron transfer is obviously evidenced from in situ X-ray absorption spectroscopy showing the elongation of (RhO) bond under visible light irradiation. This is the first spectroscopic evidence for the important role of substituent ion in the photoinduced electron transfer of hybrid-type photocatalyst. The CdS-Ti(5.2-x)/6Rhx/2O2 nanohybrids show much higher photocatalytic activity for H2 production and better photostability than do CdS and unsubstituted CdS-TiO2 nanohybrid. This result is ascribable to the enhancement of visible light absorptivity, the depression of electron-hole recombination, and the enhanced hole curing of CdS upon Rh substitution. The present study underscores that the hybridization with composition-controlled inorganic nanosheet provides a novel efficient methodology to optimize the photo-related functionalities of semiconductor nanocrystal.

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