Journal
SOLID STATE IONIC DEVICES 10
Volume 64, Issue 2, Pages 73-80Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/06402.0073ecst
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A typical anode for solid oxide fuel cells (SOFC) or cathode for solid oxide electrolysis cells (SOEC) is a complex porous structure of Ni and yttria-stabilized zirconia (YSZ). The porous Ni/YSZ is usually prepared from powder mixtures of NiO and YSZ, tape casted and sintered into a dense structure and finally reduced during start-up of the SOFC/SOEC in H-2 at the operating temperature of the cell (ca. 800 degrees C). This contribution presents environmental transmission electron microscopy (ETEM) nanoscale observations of the reduction process of a NiO/YSZ powder in H-2 at temperatures up to almost 1000 degrees C. The study focusses on the temperature dependent dynamical morphology of the NiO/YSZ and on the possible influence of YSZ on the NiO reduction.
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