In situ redox cycle of a nickel-YSZ fuel cell anode in an environmental transmission electron microscope

Environmental transmission electron microscopy is used in combination with density functional theory calculations to study the redox stability of a nickel/yttria-stabilized zirconia solid oxide fuel cell anode. The results reveal that the transfer of oxygen from NiO to yttria-stabilized zirconia triggers the reduction reaction. During Ni reoxidation, the creation of a porous structure, due to mass transport, accounts for the redox instability of the Ni-based anode. Both the expansion of NiO during a redox cycle and the presence of stress in the yttria-stabilized zirconia grains are observed directly. Besides providing an understanding of the Ni-YSZ anode redox degradation, the observations are used to propose an alternative anode design for improved redox tolerance. © 2010 Acta Materialia Inc.


Published in:
Acta Materialia, 58, 14, 4578-4589
Year:
2010
Publisher:
Elsevier
ISSN:
13596454
Keywords:
Laboratories:




 Record created 2010-10-18, last modified 2018-03-18


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)