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- W4386852749 abstract "Long-term solid oxide electrolysis operation (SOEC) testing was performed to study the performance and performance degradation of LSCF-SDC/YSZ/Ni-YSZ cells under temperatures of 750 o C, 800 o C, and 850 o C, current density of 0.5A/cm 2 and 1.0A/cm 2 , and H 2 /H 2 O ratio of 1:1, 1:3, and 2:1. Operational temperature, current density, and H 2 /H 2 O ratio played important roles in the cells’ performance and performance degradation. These factors were correlated and should be balanced and/or optimized to maximize overall lifetime performance. LSCF-SDC cells showed better performance and less performance degradation under higher temperature. Electrochemical impedance spectroscopy (EIS) data showed polarization resistance was significantly lower for the cell operated at higher temperature. Therefore, SOEC operation may need relatively higher temperature to be activated. Long-term SOEC testing under different current density showed better performance and less performance degradation at 0.5A/cm 2 , 850 o C, and 1:1 of H 2 /H 2 O ratio. H 2 /H 2 O ratio in the functional layer of the cell also played an important role. The cell showed best performance and less performance degradation under 1:1 of H 2 /H 2 O ratio. EIS data showed the polarization resistance was significantly lower under 1:1 of H 2 /H 2 O ratio. H 2 /H 2 O ratio needs to be optimized for different operational temperature and current density. Overdosed steam may react with Ni causing Ni movement in the H 2 electrode, adding to cell degradation. Transmission electron microscopy (TEM) studies identified the formation of the (CoFe)O x along the SDC grain boundaries, which could impact both the SDC conductivity and the LSCF catalytic activity due to the loss of the transition metals in the LSCF. TEM analysis of the H 2 electrode identified a large number of NiO clusters relocated into the original pore region, seemingly formed during Ni migration. This NiO formation in the H 2 electrode during SOEC operation is another cause of long-term performance degradation." @default.
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- W4386852749 date "2023-08-28" @default.
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- W4386852749 title "Optimization of Extrinsic Impact Factors for Improving Performance and Mitigating Performance Degradation of LSCF-SDC/YSZ/Ni-YSZ Cells Under Solid Oxide Electrolysis Operation" @default.
- W4386852749 doi "https://doi.org/10.1149/ma2023-0154331mtgabs" @default.
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