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Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis
Author(s) -
Rao M.,
Jensen S. H.,
Sun X.,
Hagen A.
Publication year - 2019
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201800166
Subject(s) - electrolysis , dielectric spectroscopy , electrolyte , degradation (telecommunications) , materials science , context (archaeology) , electrode , oxide , renewable energy , energy storage , electrochemistry , durability , electrolytic cell , chemical engineering , process engineering , computer science , power (physics) , chemistry , electrical engineering , physics , engineering , composite material , telecommunications , paleontology , quantum mechanics , metallurgy , biology
In the renewable energy scenario, energy storage is of essence. In this context, power‐to‐liquid (PtL) and power‐to‐gas (PtG) concepts have attracted large attention, where the use of solid oxide electrolysis cells (SOECs) has a huge potential, due to their high conversion efficiencies. However, performance and durability of these cells still need to be improved for a large‐scale commercialization of the SOEC technology. It is often difficult to identify the various loss and degradation mechanisms limiting the cell performance and durability. This paper contributes to this scientific discussion, by providing a careful analysis of the degradation mechanisms occurring in three different cells during long‐term H 2 O and CO 2 co‐electrolysis, at 1,200 mV. Electrochemical impedance spectroscopy (EIS) is measured before, during and after the electrolysis operation, and is utilized to address the individual electrode degradation mechanisms and the development of leaks through the electrolyte. Moreover, the leak rates under open circuit voltage (OCV) measurements were compared. In addition, microstructural analysis of the electrodes and electrolytes is related to the electrochemical findings to contribute to the discussion on the interdependency of the degradation mechanisms.