Manipulating the ferroelectric polarization state of BaTiO3 thin films

Datta, Sukanya; Rioult, Maxime; Stanescu, Dana; Magnan, H.; Barbier, Antoine

doi:10.1016/j.tsf.2016.03.059

Cited by 14 publications

(10 citation statements)

References 29 publications

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“…The current flow between the sample and the counter electrode was monitored to be not higher than 1 mA in order to avoid damaging the sample. 19 , 39 …”

Section: Methodsmentioning

confidence: 99%

Controlled Porosity in Ferroelectric BaTiO₃ Photoanodes

Augurio

Álvarez-Fernández

Panchal

et al. 2022

ACS Appl. Mater. Interfaces

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The use of ferroelectric polarization to promote electron–hole separation has emerged as a promising strategy to improve photocatalytic activity. Although ferroelectric thin films with planar geometry have been largely studied, nanostructured and porous ferroelectric thin films have not been commonly used in photo-electrocatalysis. The inclusion of porosity in ferroelectric thin films would enhance the surface area and reactivity, leading to a potential improvement of the photoelectrochemical (PEC) performance. Herein, the preparation of porous barium titanate (pBTO) thin films by a soft template-assisted sol–gel method is reported, and the control of porosity using different organic/inorganic ratios is verified by the combination of scanning electron microscopy and ellipsometry techniques. Using piezoresponse force microscopy, the switching of ferroelectric domains in pBTO thin films is observed, confirming that the ferroelectric polarization is still retained in the porous structures. In addition, the presence of porosity in pBTO thin films leads to a clear improvement of the PEC response. By electrochemical poling, we also demonstrated the tuning of the PEC performance of pBTO thin films via ferroelectric polarization. Our work offers a simple and low-cost approach to control the morphology optimization of ferroelectric thin films, which could open up the development of materials with great potential for PEC applications.

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“…The current flow between the sample and the counter electrode was monitored to be not higher than 1 mA in order to avoid damaging the sample. 19 , 39 …”

Section: Methodsmentioning

confidence: 99%

Controlled Porosity in Ferroelectric BaTiO₃ Photoanodes

Augurio

Álvarez-Fernández

Panchal

et al. 2022

ACS Appl. Mater. Interfaces

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“…135 In this paper, we study the surface chemistry of PbTiO 3 (001) as a representative of the larger family of ferroelectric oxides. 136,137 We believe our results can be extended to other ferroelectric oxides (including PbZr x Ti 1Àx O 3 or BaTiO 3 solid solutions 95,[138][139][140][141][142][143] ) since the polarization-dependent surface chemistry is not controlled by the exact type of atoms on the surface but the magnitude and sign of the ferroelectric polarization perpendicular to the surface which in turn dictates the doped surface charge. [33][34][35] We examine Pb terminated (001) PbTiO 3 because our calculations show that a Pb-terminated (as opposed to Ti terminated) surface is always more thermodynamically stable [144][145][146][147] in agreement with the experimental and theoretical literature.…”

Section: Introductionmentioning

confidence: 90%

Polarization-driven catalysis via ferroelectric oxide surfaces

Kakekhani

Ismail‐Beigi

2016

Phys. Chem. Chem. Phys.

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The surface chemistry and physics of oxide ferroelectric surfaces with a fixed polarization state have been studied experimentally for some time. Here, we discuss the possibility of using these materials in a different mode, namely under cyclically changing polarization conditions achievable via periodic perturbations by external fields (e.g., temperature, strain or electric field). We use Density Functional Theory (DFT) and electronic structure analysis to understand the polarization-dependent surface physics and chemistry of ferroelectric oxide PbTiO3 as an example of this class of materials. This knowledge is then applied to design catalytic cycles for industrially important reactions including NOx direct decomposition and SO2 oxidation into SO3. The possibility of catalyzing direct partial oxidation of methane to methanol is also investigated. More generally, we discuss how using ferroelectrics under cyclically changing polarization conditions can help overcome some of the fundamental challenges facing the catalysis community such as the limitations imposed by the Sabatier principle and scaling relations.

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“…On the contrary, only few studies have considered BTO thin films on a substrate, while it could be of great interest to take advantage of the surface properties of polarised films. Barbier and coworkers 1,27 as well as Lu et al 28 have experimentally explored the polarisation of BTO thin films deposited on Nb:SrTiO 3 photo anodes. In the meantime, Pancotti et al 29 have combined X-Ray Photoelectron Diffraction (XPD) and multiple scattering simulations to characterize the surface rumpling and relaxation of ferroelectric BTO(001) single crystal.…”

Section: Introductionmentioning

confidence: 99%