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Updated: Jun 13, 2025
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
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Tunable Ferroionic Properties in CeO2/BaTiO3 Heterostructures.
Milica Vasiljevic1, Francesco Chiabrera2, Denis Alikin3
1Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, 2800, Kongens Lyngby, Denmark.
ACS Applied Materials & Interfaces
|September 13, 2024
Summary
Researchers demonstrate tunable polarization in ceria thin films using ferroelectric interfaces. This ferroionic material approach enables control over water molecule adsorption and splitting for enhanced catalysis.
Area of Science:
- Materials Science
- Surface Science
- Electrochemistry
Background:
- Ferroionic materials integrate ferroelectricity with ionic conductivity.
- Controlling polarization in thin films is crucial for advanced electronic and catalytic applications.
Purpose of the Study:
- To introduce and investigate tunable polarization in cerium dioxide (CeO2-δ) thin films.
- To explore the influence of a buried ferroelectric interface on ceria's properties.
- To demonstrate the potential for electrochemically enhanced catalysis.
Main Methods:
- Fabrication of 5 nm CeO2-δ films on 10 nm BaTiO3 (BTO) ferroelectric films.
- Utilizing SrO or TiO2 terminated Nb:SrTiO3 substrates to engineer BTO polarization.
- Investigating defect dynamics (oxygen vacancies, polarons) in ceria via interface polarization.
- Analyzing surface potential modulation and its effect on water adsorption/ionization.
Main Results:
- Ceria thin films replicated the polarization of the buried BTO interface.
- Tunable oxidative/reductive (redox) properties were achieved at the ceria surface.
- Surface potential inversion modulated water adsorption-desorption and ionization overpotentials by ±400 mV.
- Demonstrated control over water molecule interactions based on ceria termination polarity.
Conclusions:
- Ferroionic concept successfully applied to tune ceria thin film properties.
- Built-in polarization at ferroelectric interfaces offers a method for defect engineering in adjacent oxide layers.
- Tunable redox properties of ceria open new avenues for wireless, electrochemically enhanced catalysis.
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