Journal article
Ni/YSZ electrode degradation studied by impedance spectroscopy — Effect of p(H2O)
Electrochemical Evaluation, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark1
Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Electrochemistry, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Anode supported solid oxide fuel cells have been tested and the degradation over time was monitored and analyzed by impedance spectroscopy. Reproducibility of initial cathode, anode and electrolyte performance was obtained. Anode (Ni/YSZ) degradation was analyzed for tests applying p(H2O) of 0.2 atm, 0.4 atm and 0.6 atm at 750 °C and 0.75 A/cm2.
The anode degradation could be well described by the equation: RNi,TPB(t) = RNi,0 + ΔR∙(1 − exp(− t / τ)). The initial resistance and total increase for the Ni–YSZ charge transfer resistance, RNi,0 and ΔR, were similar for all tests (i.e. not directly correlated with p(H2O)), but the characteristic time, τ, for the anode degradation was significantly higher for the test at p(H2O) = 0.2 atm than at p(H2O) of 0.4 atm and 0.6 atm.
Language: | English |
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Year: | 2011 |
Pages: | 547-551 |
ISSN: | 18727689 and 01672738 |
Types: | Journal article |
DOI: | 10.1016/j.ssi.2010.01.004 |
ORCIDs: | Hauch, Anne , Mogensen, Mogens Bjerg and Hagen, Anke |
Anode degradation Impedance spectroscopy Impurities Ni/YSZ electrode SOFC