Journal Article

FZJ-2016-04128

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Sulphur Poisoning Behaviour of Gadolinia Doped Ceria Model Systems in Reducing Atmospheres

Gerstl, M. (Corresponding author) ; Nenning, A. ; Iskandar, R. ; Rojek-Wöckner, V. ; Bram, M.FZJ* ; Hutter, H. ; Opitz, A. K.

2016
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/12038  doi:10.3390/ma9080649

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.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)
2. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2016

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Database coverage:
; ; ; ; Current Contents - Engineering, Computing and Technology ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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