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000908877 1001_ $$0P:(DE-Juel1)180863$$aWolf, Stephanie E.$$b0$$eCorresponding author
000908877 245__ $$aSteam Electrolysis vs. Co-Electrolysis: Mechanistic Studies of Long-Term Solid Oxide Electrolysis Cells
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000908877 520__ $$aHigh-temperature electrolysis using solid oxide electrolysis cells (SOECs) is an innovative technology to temporarily store unused electrical energy from renewable energy sources. However, they show continuous performance loss during long-term operation, which is the main issue preventing their widespread use. In this work, we have performed the long-term stability tests up to 1000 h under steam and co-electrolysis conditions using commercial NiO-YSZ/YSZ/GDC/LSC single cells in order to understand the degradation process. The electrolysis tests were carried out at different temperatures and fuel gas compositions. Intermittent AC- and DC- measurements were performed to characterize the single cells and to determine the responsible electrode processes for the degradation during long-term operation. An increased degradation rate is observed at 800°C compared to 750°C under steam electrolysis conditions. Moreover, a lower degradation rate is noticed under co-electrolysis operation in comparison to steam electrolysis operation. Finally, the post-test analyses using SEM-EDX and XRD were carried out in order to understand the degradation mechanism. The delamination of LSC is observed under steam electrolysis conditions at 800°C, however, such delamination is not observed during co-electrolysis operation. In addition, Ni-depletion and agglomeration are observed on the fuel electrode side for all the cells.
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000908877 536__ $$0G:(DE-Juel1)HITEC-20170406$$aHITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406)$$cHITEC-20170406$$x2
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000908877 7001_ $$0P:(DE-Juel1)169490$$aVibhu, Vaibhav$$b1$$eCorresponding author
000908877 7001_ $$0P:(DE-Juel1)187411$$aTröster, Eric$$b2
000908877 7001_ $$0P:(DE-Juel1)129936$$aVinke, Izaak C.$$b3
000908877 7001_ $$0P:(DE-Juel1)156123$$aEichel, Rüdiger-A.$$b4
000908877 7001_ $$0P:(DE-Juel1)129952$$ade Haart, L. G. J.$$b5
000908877 773__ $$0PERI:(DE-600)2437446-5$$a10.3390/en15155449$$gVol. 15, no. 15, p. 5449 -$$n15$$p5449$$tEnergies$$v15$$x1996-1073$$y2022
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