Journal Article

FZJ-2022-02891

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Steam Electrolysis vs. Co-Electrolysis: Mechanistic Studies of Long-Term Solid Oxide Electrolysis Cells

Wolf, S. E. (Corresponding author)FZJ*RWTH* ; Vibhu, V. (Corresponding author)FZJ* ; Tröster, E.FZJ* ; Vinke, I. C.FZJ* ; Eichel, R.-A.FZJ*RWTH* ; de Haart, L. G. J.FZJ*

2022
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/31586  doi:10.3390/en15155449

Abstract: High-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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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)
2. 1232 - Power-based Fuels and Chemicals (POF4-123) (POF4-123)
3. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2022

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