Mapping electrochemically driven gas exchange of mixed conducting SrTi sub(0.7)Fe sub(0.3)O sub(3- delta ) and Ce sub(0.8)Gd sub(0.2)O sub(1.9) thin films by super(18)O tracer incorporation under reducing atmosphere

Thermally and electrochemically driven super(18)O tracer exchange experiments in H sub(2)/H sub(2) super(18)O atmosphere were performed on SrTi sub(0.7)Fe sub(0.3)O sub(3- delta ) and Ce sub(0.8)Gd sub(0.2)O sub(2- delta ) thin films on single crystalline YSZ substrates. Noble metal current collecto...

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Bibliographic Details
Published in:Solid state ionics 2015-05, Vol.273, p.25-29
Main Authors: Nenning, Andreas, Navickas, Edvinas, Velicsanyi, Peter, Opitz, Alexander K, Hutter, Herbert, Fleig, Jurgen
Format: Article
Language:English
Subjects:
Accumulators
Collectors
Electronics
Exchange
Ion exchangers
Secondary ion mass spectrometry
Thin films
Tracers
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Summary:Thermally and electrochemically driven super(18)O tracer exchange experiments in H sub(2)/H sub(2) super(18)O atmosphere were performed on SrTi sub(0.7)Fe sub(0.3)O sub(3- delta ) and Ce sub(0.8)Gd sub(0.2)O sub(2- delta ) thin films on single crystalline YSZ substrates. Noble metal current collectors were deposited on both films and electrochemically polarized during the exchange experiment. The resulting tracer distribution was analyzed by spatially resolved secondary ion mass spectrometry. Increased tracer fraction near the current collectors was found under cathodic polarization and decreased tracer fraction under anodic polarization. High cathodic bias leads to enhanced n-type electronic conductivity, which increases the extent of the electrochemically active zone.
ISSN:0167-2738
DOI:10.1016/j.ssi.2014.10.024