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

Thermally and electrochemically driven (18)O tracer exchange experiments in H(2)/H(2)(18)O atmosphere were performed on SrTi(0.7)Fe(0.3)O(3 − δ) and Ce(0.8)Gd(0.2)O(2 − δ) thin films on single crystalline YSZ substrates. Noble metal current collectors were deposited on both films and electrochemical...

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Detalles Bibliográficos
Autores principales: Nenning, Andreas, Navickas, Edvinas, Velicsanyi, Peter, Opitz, Alexander K., Hutter, Herbert, Fleig, Jürgen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier Science B.V 2015
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4986286/
https://www.ncbi.nlm.nih.gov/pubmed/27570332
http://dx.doi.org/10.1016/j.ssi.2014.10.024
Descripción
Sumario:Thermally and electrochemically driven (18)O tracer exchange experiments in H(2)/H(2)(18)O atmosphere were performed on SrTi(0.7)Fe(0.3)O(3 − δ) and Ce(0.8)Gd(0.2)O(2 − δ) 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.

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