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

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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.
Original languageEnglish
JournalFuel Cells
Volume19
Issue number4
Pages (from-to)445-457
ISSN1615-6846
DOIs
Publication statusPublished - 2019
Event13th EUROPEAN SOFC & SOE FORUM - Kultur- und Kongresszentrum Luzern, Lucerne, Switzerland
Duration: 3 Jul 20186 Jul 2018
Conference number: 13
http://www.efcf.com/

Conference

Conference13th EUROPEAN SOFC & SOE FORUM
Number13
LocationKultur- und Kongresszentrum Luzern
CountrySwitzerland
CityLucerne
Period03/07/201806/07/2018
Internet address

Bibliographical note

Special Issue: 13th European SOFC & SOE Forum

CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

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

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