In this research a cell stack with standard power output 100 W was tested over the period of 3700 hours. After the long-term operation subsequent post-test analysis of anode microstructure has been conducted using combination of focused ion beam and scanning electron microscopy. Obtained data was reconstructed into threedimensional images, based on which the microstructure parameters were obtained. The microstructure parameters were quantified at three different locations in the selected cells: inlet, middle and outlet. The obtained results indicate strong microstructure morphology change after long operation time and revealed a nonhomogeneous degradation behavior.
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