Abstract
Thermal gradients can arise within solid oxide fuel cells (SOFCs) due to start-up and shut-down, non-uniform gas distribution, fast cycling and operation under internal reforming conditions. Here, the effects of operationally relevant thermal gradients on Ni/YSZ SOFC anode half cells are investigated using combined synchrotron X-ray diffraction and thermal imaging. The combination of these techniques has identified significant deviation from linear thermal expansion behaviour in a sample exposed to a one dimensional thermal gradient. Stress gradients are identified along isothermal regions due to the presence of a proximate thermal gradient, with tensile stress deviations of up to 75MPa being observed across the sample at a constant temperature. Significant strain is also observed due to the presence of thermal gradients when compared to work carried out at isothermal conditions.
Original language | English |
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Pages (from-to) | 473-481 |
Number of pages | 9 |
Journal | Journal of Power Sources |
Volume | 288 |
DOIs | |
Publication status | Published - 15 Aug 2015 |
Keywords
- Infrared imaging
- Solid oxide fuel cell
- Stress analysis
- Synchrotron radiation
- Thermal imaging
- X-ray diffraction