TY  - JOUR
AU  - Gerstl, Matthias
AU  - Nenning, Andreas
AU  - Iskandar, Riza
AU  - Rojek-Wöckner, Veronika
AU  - Bram, Martin
AU  - Hutter, Herbert
AU  - Opitz, Alexander Karl
TI  - The Sulphur Poisoning Behaviour of Gadolinia Doped Ceria Model Systems in Reducing Atmospheres
JO  - Materials
VL  - 9
IS  - 8
SN  - 1996-1944
CY  - Basel
PB  - MDPI
M1  - FZJ-2016-04128
SP  - 649
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000380762000040
C6  - pmid:28773771
DO  - DOI:10.3390/ma9080649
UR  - https://juser.fz-juelich.de/record/811773
ER  -