the sulphur poisoning behaviour of gadolinia doped ceria model systems in reducing atmospheres

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ID: 240851
2016
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Abstract
An array of analytical methods including surface area determination by gas adsorption using the Brunauer, Emmett, Teller (BET) method, combustion analysis, XRD, ToF-SIMS, TEM and impedance spectroscopy has been used to investigate the interaction of gadolinia doped ceria (GDC) with hydrogen sulphide containing reducing atmospheres. It is shown that sulphur is incorporated into the GDC bulk and might lead to phase changes. Additionally, high concentrations of silicon are found on the surface of model composite microelectrodes. Based on these data, a model is proposed to explain the multi-facetted electrochemical degradation behaviour encountered during long term electrochemical measurements. While electrochemical bulk properties of GDC stay largely unaffected, the surface polarisation resistance is dramatically changed, due to silicon segregation and reaction with adsorbed sulphur.
Reference Key
gerstl2016materialsthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Matthias Gerstl;Andreas Nenning;Riza Iskandar;Veronika Rojek-Wöckner;Martin Bram;Herbert Hutter;Alexander Karl Opitz
Journal Nature Materials
Year 2016
DOI
10.3390/ma9080649
URL
http://www.mdpi.com/1996-1944/9/8/649
Keywords
xrd ceria microelectrodes electrochemical impedance spectroscopy xps bet electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general) temtechnologyelectrical engineering

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