4.4 Article

Unwinding Entangled Degradation Mechanisms in Solid Oxide Electrolysis Cells Through Electrode Modifications and Impedance Analysis

Journal

FUEL CELLS
Volume 19, Issue 4, Pages 445-457

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/fuce.201800166

Keywords

Co-electrolysis; Distribution of Relaxation Times; Durability; Electrochemical Impedance Spectroscopy; Infiltration; Nickel Migration; Percolation; Potentiostatic; Solid Oxide Electrolysis Cell

Funding

  1. European Union [699892]
  2. H2020 Societal Challenges Programme [699892] Funding Source: H2020 Societal Challenges Programme

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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 H2O and CO2 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.

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