Enhanced photocatalytic activity of heterostructured ferroelectric BaTiO3/α-Fe2O3 and the significance of interface morphology control

Journal article


Cui, Y, Briscoe, J, Wang, Y, Tarakina, N V and Dunn, S (2017). Enhanced photocatalytic activity of heterostructured ferroelectric BaTiO3/α-Fe2O3 and the significance of interface morphology control. ACS applied materials & interfaces. 9 (29), pp. 24518-24526.
AuthorsCui, Y, Briscoe, J, Wang, Y, Tarakina, N V and Dunn, S
Abstract

We have used a ferroelectric BaTiO3 substrate with a hematite (α-Fe2O3) nanostructured surface to form a heterogeneous BaTiO3/α-Fe2O3 photocatalyst. In this study we
show that differing the mass ratios of α-Fe2O3 on the BaTiO3 has a significant influence on photoinduced decolourisation of Rhodamine B under simulated sunlight. The highest
photocatalytic activity was obtained for BaTiO3-Fe2O3-0.001M relating to the lowest mass ratio of α-Fe2O3 in our study. This catalyst exhibited a two-fold increase in performance compared to 2 pure BaTiO3 and a five-fold increase when compared to the higher surface area pure α-Fe2O3. The increases in performance become more marked when scaled for the lower surface area of the heterostructured catalyst. The performance enhancement is associated with improved charge carrier separation at the interface between the ferroelectric surface, which exhibits a ferroelectric polarization, and the hematite. Increasing the mass ratio of hematite increases the thickness of
this layer, lowers the number of triple-point locations, and results in reduced performance enhancement. We show that the reduced performance is due to a lack of light penetrating into BaTiO3 and the relationships between the depolarization field from the ferroelectric and carriers in the hematite. Our findings demonstrate that it is possible to use the built-in electric field of a ferroelectric material to promote charge carrier separation and boost photocatalytic efficiency.

Year2017
JournalACS applied materials & interfaces
Journal citation9 (29), pp. 24518-24526
PublisherAmerican Chemical Society
Digital Object Identifier (DOI)doi:10.1021/acsami.7b03523
Publication dates
Print13 Jul 2017
Publication process dates
Deposited16 Jan 2019
Accepted13 Jul 2017
Accepted author manuscript
License
CC BY 4.0
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