In Situ Observations of Microstructural Changes in SOFC Anodes during Redox Cycling | Zendy

Trine Klemensø | Zendy; C.C. Appel | Zendy; Mogens Bjerg Mogensen | Zendy

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In Situ Observations of Microstructural Changes in SOFC Anodes during Redox Cycling

Author(s) -

Trine Klemensø,

C.C. Appel,

Mogens Bjerg Mogensen

Publication year - 2006

Publication title -

electrochemical and solid-state letters

Language(s) - English

Resource type - Journals

eISSN - 1944-8775

pISSN - 1099-0062

DOI - 10.1149/1.2214303

Subject(s) - materials science , anode , redox , oxide , scanning electron microscope , non blocking i/o , cubic zirconia , solid oxide fuel cell , chemical engineering , nickel , microstructure , temperature cycling , nickel oxide , yttria stabilized zirconia , metallurgy , electrode , composite material , ceramic , chemistry , catalysis , biochemistry , physics , thermal , meteorology , engineering

The anode-supported solid oxide fuel cell (SOFC) degrades when the anode is subjected to redox cycling. The degradation has qualitatively been related to microstructural changes in the nickel-yttria stabilized zirconia anode of the tested cells. In this work, the microstructural changes were observed in situ using environmental scanning electron microscopy. In the reduced state, a dynamic rounding of the nickel particles occurred. The oxide growth upon re-oxidation depended on the oxidation kinetics. During rapid oxidation, the NiO particles divided into 2-4 particles, which grew into the surrounding voids. For slower oxidation, an external oxide layer was seen to develop around the individual particles.

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