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Proton Conduction in Grain-Boundary-Free Oxygen-Deficient BaFeO2.5+δ Thin Films

Benes, Alexander and Molinari, Alan and Witte, Ralf and Kruk, Robert and Brötz, Joachim and Chellali, Reda and Hahn, Horst and Clemens, Oliver (2018):
Proton Conduction in Grain-Boundary-Free Oxygen-Deficient BaFeO2.5+δ Thin Films.
In: Materials, MDPI, Basel, Switzerland, p. 52, 11, (1), ISSN 1996-1944,
DOI: 10.3390/ma11010052,
[Online-Edition: https://doi.org/10.3390/ma11010052],
[Article]

Abstract

Reduction of the operating temperature to an intermediate temperature range between 350 °C and 600 °C is a necessity for Solid Oxide Fuel/Electrolysis Cells (SOFC/SOECs). In this respect the application of proton-conducting oxides has become a broad area of research. Materials that can conduct protons and electrons at the same time, to be used as electrode catalysts on the air electrode, are especially rare. In this article we report on the proton conduction in expitaxially grown BaFeO2.5+δ (BFO) thin films deposited by pulsed laser deposition on Nb:SrTiO3 substrates. By using Electrochemical Impedance Spectroscopy (EIS) measurements under different wet and dry atmospheres, the bulk proton conductivity of BFO (between 200 °C and 300 °C) could be estimated for the first time (3.6 × 10−6 S cm−1 at 300 °C). The influence of oxidizing measurement atmosphere and hydration revealed a strong dependence of the conductivity, most notably at temperatures above 300 °C, which is in good agreement with the hydration behavior of BaFeO2.5 reported previously.

Item Type: Article
Erschienen: 2018
Creators: Benes, Alexander and Molinari, Alan and Witte, Ralf and Kruk, Robert and Brötz, Joachim and Chellali, Reda and Hahn, Horst and Clemens, Oliver
Title: Proton Conduction in Grain-Boundary-Free Oxygen-Deficient BaFeO2.5+δ Thin Films
Language: English
Abstract:

Reduction of the operating temperature to an intermediate temperature range between 350 °C and 600 °C is a necessity for Solid Oxide Fuel/Electrolysis Cells (SOFC/SOECs). In this respect the application of proton-conducting oxides has become a broad area of research. Materials that can conduct protons and electrons at the same time, to be used as electrode catalysts on the air electrode, are especially rare. In this article we report on the proton conduction in expitaxially grown BaFeO2.5+δ (BFO) thin films deposited by pulsed laser deposition on Nb:SrTiO3 substrates. By using Electrochemical Impedance Spectroscopy (EIS) measurements under different wet and dry atmospheres, the bulk proton conductivity of BFO (between 200 °C and 300 °C) could be estimated for the first time (3.6 × 10−6 S cm−1 at 300 °C). The influence of oxidizing measurement atmosphere and hydration revealed a strong dependence of the conductivity, most notably at temperatures above 300 °C, which is in good agreement with the hydration behavior of BaFeO2.5 reported previously.

Journal or Publication Title: Materials
Volume: 11
Number: 1
Publisher: MDPI, Basel, Switzerland
Uncontrolled Keywords: pulsed laser deposition, functional thin films, electrochemistry, electrode catalysts, barium ferrite, solid oxide fuel cells
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
Date Deposited: 21 Jan 2018 20:55
DOI: 10.3390/ma11010052
Official URL: https://doi.org/10.3390/ma11010052
URN: urn:nbn:de:tuda-tuprints-72022
Funders: A. Benes acknowledges the financial support by the DFG in the framework of the Excellence Initiative, Darmstadt Graduate School of Excellence Energy Science and Engineering (GSC 1070)., O. Clemens acknowledges funding by DFG within CL551/2-1., We acknowledge support by the German Research Foundation and the Open Access Publishing Fund of Technische Universität Darmstadt.
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