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Proton Conduction in Grain-Boundary-Free Oxygen-Deficient BaFeO$_{2.5+δ}$ Thin Films

Benes, Alexander 1; Molinari, Alan 1; Witte, Ralf 1; Kruk, Robert 1; Brötz, Joachim; Chellali, Reda 1; Hahn, Horst 1; Clemens, Oliver
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


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.

Verlagsausgabe §
DOI: 10.5445/IR/1000083831
Veröffentlicht am 22.06.2018
DOI: 10.3390/ma11010052
Zitationen: 20
Web of Science
Zitationen: 18
Zitationen: 19
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000083831
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Materials
Verlag MDPI
Band 11
Heft 1
Seiten Art. Nr.: 52
Vorab online veröffentlicht am 29.12.2017
Schlagwörter pulsed laser deposition; functional thin films; electrochemistry; electrode catalysts; barium ferrite; solid oxide fuel cells; 2017-018-019169 TEM
Nachgewiesen in Web of Science
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