Journal article · Conference paper
In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope
Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500{degree sign}C. The reduction is done under low hydrogen pressure. The reduction initiates at the NiO/YSZ interface, then moves to the center of the NiO grain.
At higher temperature the reduction occurs also at the free NiO surface and the NiO/NiO grain boundaries. The growth of Ni is epitaxial on its oxide. Due to high volume decrease, nanopores are formed during reduction. During oxidation, oxide nanocrystallites are formed on the nickel surface. The crystallites fill up the nickel porosity and create an inhomogeneous structure with remaining voids.
This change in structure causes the nickel oxide to expand during a RedOx cycle.
| Language: | English |
|---|---|
| Publisher: | The Electrochemical Society |
| Year: | 2009 |
| Pages: | 1985-1992 |
| Proceedings: | 216th ECS Meeting |
| ISSN: | 19386737 and 19385862 |
| Types: | Journal article and Conference paper |
| DOI: | 10.1149/1.3205743 |
| ORCIDs: | Wagner, Jakob Birkedal and Hansen, Thomas Willum |
