Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber

Wei Li, Chang Liu, Yaxin Zhou, Yang Bai, Xin Feng, Zhuhong Yang, Linghong Lu, Xiaohua Lu*, Kwong Yu Chan

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials.

Original languageEnglish
Pages (from-to)20539-20545
Number of pages7
JournalJournal of Physical Chemistry C
Volume112
Issue number51
DOIs
Publication statusPublished - 1 Dec 2008

Fingerprint

Nanofibers
anatase
Titanium dioxide
Valence bands
energy bands
Conduction bands
conduction bands
valence
Single crystals
Crystalline materials
single crystals
titanium dioxide
titanium oxides
roasting
iodine
Iodine
Electron diffraction
potassium
Calcination
Diffraction patterns

Cite this

Li, Wei ; Liu, Chang ; Zhou, Yaxin ; Bai, Yang ; Feng, Xin ; Yang, Zhuhong ; Lu, Linghong ; Lu, Xiaohua ; Chan, Kwong Yu. / Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber. In: Journal of Physical Chemistry C. 2008 ; Vol. 112, No. 51. pp. 20539-20545.
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title = "Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber",
abstract = "A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50{\%} increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials.",
author = "Wei Li and Chang Liu and Yaxin Zhou and Yang Bai and Xin Feng and Zhuhong Yang and Linghong Lu and Xiaohua Lu and Chan, {Kwong Yu}",
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Li, W, Liu, C, Zhou, Y, Bai, Y, Feng, X, Yang, Z, Lu, L, Lu, X & Chan, KY 2008, 'Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber', Journal of Physical Chemistry C, vol. 112, no. 51, pp. 20539-20545. https://doi.org/10.1021/jp808183q

Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber. / Li, Wei; Liu, Chang; Zhou, Yaxin; Bai, Yang; Feng, Xin; Yang, Zhuhong; Lu, Linghong; Lu, Xiaohua; Chan, Kwong Yu.

In: Journal of Physical Chemistry C, Vol. 112, No. 51, 01.12.2008, p. 20539-20545.

Research output: Contribution to journalArticle

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T1 - Enhanced photocatalytic activity in anatase/TiO2(B) core-shell nanofiber

AU - Li, Wei

AU - Liu, Chang

AU - Zhou, Yaxin

AU - Bai, Yang

AU - Feng, Xin

AU - Yang, Zhuhong

AU - Lu, Linghong

AU - Lu, Xiaohua

AU - Chan, Kwong Yu

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N2 - A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials.

AB - A bicrystalline titanium dioxide nanofiber with enhanced photocatalytic activity was synthesized from potassium titanate K2Ti 2O5 via ion exchange and calcination. The nanofiber has a core-shell crystalline structure with a thin TiO2(B) phase sheathing the anatase core, as characterized by X-ray diffraction, Raman spectroscopy, and high-resolution transmission microscopy (HRTEM). From HRTEM and local electron diffraction patterns, the two crystalline phases form a coherent interface with the 0.34-nm spacing between the (102) planes of TiO2(B) matching that between the anatase (101) lattice planes. The core-shell anatase/TiO 2(B) nanofiber shows enhanced photocatalytic activity in iodine oxidation reaction with a 20-50% increase in extent of reaction compared to either single-crystal anatase or single-crystal TiO2(B) nanofibers. Anatase and TiO2(B) have the same band gap value of 3.2 eV, while theoretical calculations show the conduction band (CB) and valence band (VB) energies in anatase are both lower than the corresponding CB and VB energies in TiO2(B). The enhanced photocatalytic property may be due to enhanced and concerted charge mobility toward or away from the anatase/TiO2(B) interface. The special structure-property relationship can provide a new strategy to design and fabricate efficient photocatalytic and photovoltaic materials.

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