Electrochemical characterization of a CFY-stack with planar electrolyte-supported solid oxide cells in rSOC operation

Michael Preininger, Vanja Subotić, Bernhard Stöckl, Richard Schauperl, David Reichholf, Stefan Megel, Mihails Kusnezoff, Christoph Hochenauer

Research output: Contribution to journalArticle

Abstract

In this study, a ten-layer SOC-stack, consisting of large planar electrolyte supported cells (ESC) and CFY interconnects, was operated in both fuel cell and electrolysis modes considering steam-, co-, and CO2-electrolysis. Different gas mixtures containing H2, H2O, CO, CO2, and N2 were applied for this purpose, and an extensive analyses were performed at two temperatures, 800°C and 850°C. Under these operating conditions, independent Electrochemical Impedance Spectroscopy (EIS) measurements were performed on the stack as a whole, and several cells within the stack concurrently. In order to analyze the losses that occurred during operation, measured impedance values were analyzed, and an electrical equivalent circuit (EEC) for ESCs was applied to the measured impedance spectra. Finally, the electrochemical impedance measurements were performed at both OCV and elevated current densities.
Original languageEnglish
Pages (from-to)12398-12412
Number of pages15
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number27
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • reversible Solid Oxide Cell (rSOC)
  • Electrolyte supported cell (ESC)
  • Steam electrolysis
  • Co-electrolysis
  • Hybrid EIS
  • Multipoint EIS

Fields of Expertise

  • Sustainable Systems

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