Influence of ferroelectric dipole on the photocatalytic activity of heterostructured BaTiO3/α-Fe2O3

Journal article


Cui, Y, Sun, H, Briscoe, J, Wilson, R, Tarakina, N, Dunn, S and Pu, Y (2019). Influence of ferroelectric dipole on the photocatalytic activity of heterostructured BaTiO3/α-Fe2O3. Nanotechnology. 30 (25).
AuthorsCui, Y, Sun, H, Briscoe, J, Wilson, R, Tarakina, N, Dunn, S and Pu, Y
Abstract

Using BaTiO3 as a model ferroelectric material we investigated the influence of the ferroelectric dipole on the photocatalytic activity of a heterogeneous BaTiO3/α-Fe2O3 photocatalyst. Two distinct BaTiO3 samples were used: BTO and BTO-A. The latter consists more ferroelectric tetragonal phase and thus stronger ferroelectricity. It was found that under identical experimental conditions, the photodecolourisation rate of a target dye using BTO-A/α-Fe2O3 under visible light was 1.3 times that of BTO/α-Fe2O3. Photoelectrochemical and photoluminescence analysis confirmed a more effective charge carrier separation in BTO-A/α-Fe2O3. Considering solely the photoexcitation of α-Fe2O3 in the composite photocatalysts under visible light and the similar microstructures of the two catalysts, we propose that the enhanced decolourisation rate when using BTO-A/α-Fe2O3 is due to the improved charge carrier separation and extended charge carrier lifetime arising from an interaction between the ferroelectric dipole and the carriers in α-Fe2O3. Our results demonstrate a new process to use a ferroelectric dipole to manipulate the charge carrier transport, overcome recombination, and extend the charge carrier lifetime of the surface material in a heterogeneous catalyst system.

Year2019
JournalNanotechnology
Journal citation30 (25)
PublisherIOP Publishing
ISSN1361-6528
Digital Object Identifier (DOI)doi:10.1088/1361-6528/ab0b00
Publication dates
Print27 May 2019
Publication process dates
Deposited13 May 2019
Accepted27 Feb 2019
Accepted author manuscript
License
CC BY 4.0
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https://openresearch.lsbu.ac.uk/item/86670

Accepted author manuscript

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